Difference between revisions of "Kerbin"

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{{:Kerbin/Data}}
 
  
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'''Kerbin''' is the home planet of the [[Kerbal]]s, the location of the [[Kerbal Space Center|Space Center]], and the main focus of [[Kerbal Space Program]]. It is the [[w:Earth|Earth]] analog for the game. It has two [[moon]]s, named '''[[Mün]]''' and '''[[Minmus]]'''.
+
{{Infobox/Body}}
 +
'''Kerbin''' is the home planet of the [[Kerbal]]s, the location of the [[Kerbal Space Center|Space Center]] and other facilities, and the main focus of [[Kerbal Space Program]]. It is also the [[w:Earth|Earth]] analog for the game but, unlike Earth, it has two [[moon]]s instead of one. They are named '''[[the Mun]]''' and '''[[Minmus]]'''. It is the planet you start your game on, being home to the [[KSC]], where you construct and launch your vehicles on.
  
−
Kerbin is the third planet in [[orbit]] around the star [[Kerbol]]. It is the third largest planet (after [[Jool]] and [[Eve]]) and the fourth largest celestial object around Kerbol (with [[Tylo]], a moon of Jool, being slightly larger).
+
Kerbin, the home planet in Kerbal Space Program, boasts two natural satellites: the larger Mun and the smaller Minmus. The Mun, resembling Earth's moon, is characterized by its gray, cratered surface, offering ample opportunities for exploration and scientific research. In contrast, Minmus is a unique celestial body with a mint-green hue and low gravity, making it an ideal location for mining operations and testing advanced rover technologies. Both moons orbit Kerbin in slightly eccentric orbits, providing players with diverse challenges and objectives for their space missions.
  
−
Reaching a stable orbit around Kerbin is one of the first milestones a player might achieve in the game. Achieving such an orbit with a fuel-optimal ascent<ref>A fuel-optimal ascent is one which (a) minimizes velocity losses to gravity and [[atmosphere|atmospheric drag]] and (b) launches eastward (toward the 90 degree heading) to gain 174.5 m/s of orbital velocity for free, thanks to Kerbin's rotation.</ref> requires a [[delta-V]] of ≈4500 m/s,<ref>See [http://forum.kerbalspaceprogram.com/showthread.php/24017-Least-delta-v-to-orbit this challenge on the forum] and a popular [http://i.imgur.com/CEZS1.png Kerbin delta-V chart]</ref> the second largest of all celestial bodies with a solid surface after [[Eve]]. For many interplanetary missions, this represents over half of the flight's total delta-V requirement. This is also true of Earth-based interplanetary spaceflights, leading one observer to remark that:
+
Kerbin is the third planet in [[orbit]] around the star [[Kerbol]]. It is the third largest [[celestial body]] that orbits Kerbol, following [[Jool]] and [[Eve]]. Jool's moon, [[Tylo]] has the same radius of Kerbin, though it may be classified as larger, as the highest point on [[Tylo]] is about 5&nbsp;km higher than the highest point on Kerbin. However, [[Tylo]] has only 80% of Kerbin's mass.
−
{{Quote|If you can get your ship into orbit, you're halfway to anywhere.|Robert Heinlein|quoted on page 194 of ''A Step Farther Out'' by Jerry Pournelle}}
+
 
 +
Reaching a stable orbit around Kerbin is one of the first milestones a player might achieve in the game. With the introduction of version [[1.0.3]], attaining low Kerbin orbit requires a [[delta-v|Δv]] of approximately 3400&nbsp;m/s, though the exact amount depends on the efficiency of the ascent profile and the aerodynamics of the launch vehicle and payload. The only rocky planet that requires a higher Δv to attain orbit is [[Eve]] due to its dense atmosphere and higher gravity. Many interplanetary missions expend over half of their Δv in reaching Kerbin orbit. The velocity required to escape a body from a given altitude is always exactly the square root of two, times the velocity of a circular orbit around the body at that height: <math> (\sqrt{2}*v) </math>.
 +
== In-game description ==
 +
 
 +
'''KSP 1:'''
 +
{{Quote
 +
|A unique world, Kerbin has flat plains, soaring mountains and wide, blue oceans. Home to the Kerbals, it has just the right conditions to support a vast, seemingly undepletable population of the eager green creatures.<br />
 +
<br />
 +
''Reaching a stable orbit around Kerbin is one of the first things budding space programs strive for. It is said that those who can get their ship into orbit are halfway to anywhere.''
 +
|[[Kerbal Astronomical Society]]}}
 +
 
 +
'''KSP 2:'''
 +
{{Quote
 +
|Even as rockets and probes escape its atmosphere for deep space exploration, there is still much to appreciate about this vibrant world. Its vast oceans, deserts, forests, and plains coat the surface in lively beauty. Its moons, Mun and Minmus, swirl silently above it. Kerbalkind is fortunate to call this pale blue planet their home.|}}
  
 
== Topography ==
 
== Topography ==
−
[[File:Kerbin_heightmap.jpg|thumb|left|Topographical representation of Kerbin's surface as of .18.2. Click for high resolution. by Zeroignite]]
+
[[File:Kerbin heightmap.jpg|thumb|left|Topographical representation of Kerbin's surface as of 0.18.2. Click for high resolution. by Zeroignite]]
−
Kerbin has a roughly equal distribution of surface liquid water and solid land, with polar icecaps and scattered deserts. There are mountains exceeding 4 km in height, with the tallest peak being just under 4044 m in altitude.
+
[[File:TallestMountain_small.png|thumb|left|Kerbal at Kerbin's highest peak(old)]]
 +
[[File:Kerbinpeak.png|thumb|left|A Kerbal at Kerbin's highest peak(1.12.2)]]
 +
 
 +
Kerbin has a roughly equal distribution of [[ocean|liquid surface water]] and solid land, with polar ice caps and scattered deserts. Some of its mountains exceed 6&nbsp;kilometers in height, with the tallest peak being 6767.4&nbsp;m in altitude at the coordinates 46°21'32"&nbsp;E 61°35'53"&nbsp;N. The lowest point is almost 1.4&nbsp;km deep and about 313° south-west of the Kerbal Space Center.
 +
 
 +
=== Craters ===
 +
[[File:KerbinCraterElevation.jpg|thumb|left|Terrain model centered on Kerbin's most pronounced craters]]
 +
 
 +
Unlike other bodies in its system, Kerbin has few visible craters because its environment would erode craters from the few meteors that avoid the gravity or surface of its large moon and survive entry. Nevertheless, some geological formations indicate that bodies have violently collided with Kerbin: a planetary feature appears to be an impact crater, while a secondary rupture lies on the other side of the planet (made by the intense [http://files.mundos-fantasticos.com/200000857-6eb2d6fab1/waves.jpg longitudinal], or P-wave [http://tpsearthspace12student.wikispaces.com/file/view/PwavesSwaves.jpg/113267379/PwavesSwaves.jpg earthquakes] that ensue.) Both are in excess of 100&nbsp;km diameter, and the main crater lies along the far-western coastline. The uplift is easily visible as a series of islands, and the feature has a central peak that pokes up through the water (also known as a rebound peak.) The other, and smaller of the two, is near the prime meridian in the northern hemisphere and is more easily missed, but its uplift rims are visible, and it also has a central rebound peak.
 +
 
 +
== Biomes ==
 +
 
 +
After the [[Mun]], Kerbin is the celestial body with the second-highest number of [[biome]]s. [[Science]] [[Science#Activities|experiments]] can be performed in all biomes, though Kerbin's low multipliers result in less impressive results than more distant worlds. Kerbin's biomes show a loose correlation with Earth's biomes and geographic features. Uniquely, Kerbin has 33 location biomes at KSC, these are comprised of each building and their props, the crawlerway, the flag, and KSC itself; these give a jumpstart to gathering Science points in [[Career]] mode. With 1.2 Kerbin had distinct Northern and Southern Ice Shelves added.
 +
 
 +
[[File:Kerbin biome 1800x900.png|thumb|left|Kerbin biome map as of 1.2]]
 +
{|
 +
|
 +
<span id="Planetary biome list"></span>
 +
=== List of biomes ===
 +
* Ice Caps
 +
* Northern Ice Shelf
 +
* Southern Ice Shelf
 +
* Tundra
 +
* Highlands
 +
* Mountains
 +
* Grasslands
 +
* Deserts
 +
* Badlands
 +
* Shores
 +
* Water
 +
<span id="Kerbin location biomes"></span>
 +
{{FlipBox|style=word-wrap: normal;margin: 0em 0em 0.5em; border-style: solid solid solid solid; padding: 0px; background-color: #FFFFFF; border-color:#aaaaaa; border-width:1px; width: 24em;
 +
|title=KSC mini biomes
 +
|content=
 +
* [[Inland Kerbal Space Center|Baikerbanur]]
 +
** Baikerbanur LaunchPad
 +
* Island Airfield
 +
* [[Woomerang Launch Site]]
 +
* [[Dessert Launch Site]]
 +
* [[Dessert Airfield]]
 +
* [[KSC]]
 +
** [[Administration Facility|Administration]]
 +
*** Administration Grounds
 +
** [[Astronaut Complex]]
 +
*** AstronautComplex Grounds
 +
** Crawlerway
 +
** [[Flag Pole|FlagPole]]
 +
** [[Launch Pad|LaunchPad]]
 +
*** LaunchPad Water Tower
 +
*** LaunchPad Flag Pole
 +
*** LaunchPad Round Tank
 +
*** LaunchPad Tanks
 +
** [[Mission Control]]
 +
*** MissionControl Grounds
 +
** [[Research and Development|R&D]]
 +
*** R&D Central Building
 +
*** R&D Corner Lab
 +
*** R&D Main Building
 +
*** R&D Observatory
 +
*** R&D Side Lab
 +
*** R&D Small Lab
 +
*** R&D Tanks
 +
*** R&D Wind Tunnel
 +
** [[Runway]]
 +
** [[Spaceplane Hangar|SPH]]
 +
*** SPH Main Building
 +
*** SPH Round Tank
 +
*** SPH Tanks
 +
*** SPH Water Tower
 +
** [[Tracking Station]]
 +
*** Tracking Station Dish East
 +
*** Tracking Station Dish North
 +
*** Tracking Station Dish South
 +
*** Tracking Station Hub
 +
** [[Vehicle Assembly Building|VAB]]
 +
*** VAB Main Building
 +
*** VAB Pod Memorial
 +
*** VAB Round Tank
 +
*** VAB South Complex<small>(only exist when VAB is Level 2)</small>
 +
*** VAB Tanks
 +
}}
 +
|}
  
−
Kerbin shows signs of having been impacted by an asteroid or comet. That is visible in the large crater in the western hemisphere. The crater's central peak is visible from orbit and was caused by the compression followed by the rebound of material in the center of the crater.
 
−
<div style="clear:left;"></div>
 
 
== Atmosphere ==
 
== Atmosphere ==
−
<!-- SPECULATION: Kerbin has an atmosphere of unknown composition, though because Kerbin has plants and animals, it can be assumed there is O<sub>2</sub>, N<sub>2</sub>, and CO<sub>2</sub>. -->Kerbin's [[atmosphere]] contains oxygen and extends to roughly 69,078 meters. Its atmosphere becomes exponentially less dense as altitude increases (with a scale height of 5 km).<ref>{{forum link|threadID=16000|threadName=&#91;KGSS&#93; Examining Kerbin's atmosphere}}</ref> In general, the atmospheric pressure on Kerbin, at an altitude expressed in meters, is:
+
[[File:Kerbin_Atmosphere_T&P.png|thumbnail|left|Temperature and pressure of Kerbin's atmosphere as a function of altitude.]]
 +
[[File:Kerbin_atmospheric_density.png|thumbnail|left|Drag force is proportionate to atmospheric density.]]
 +
[[File:Measures of Kerbin's atmospheric pressure|frame|left|Measures of Kerbin's atmospheric pressure]]
  
−
: <math>p_k = e^{-altitude/5000}</math>
+
<!-- SPECULATION: Kerbin has an atmosphere of unknown composition, though Kerbin's plants and animals would not survive without O<sub>2</sub>, N<sub>2</sub>, and CO<sub>2</sub>. -->
 +
Kerbin has a thick, warm [[atmosphere]] with a mass of approximately 4.7×10<sup>16</sup> kilograms, a sea level pressure of 101.325 kilopascals (1 atmosphere), and a depth of 70,000 meters.  The atmosphere contains oxygen and can support combustion.  Kerbin is one of the two celestial bodies (the other one being [[Laythe]]) with a breathable atmosphere.
  
−
The thickness of Kerbin's atmosphere makes it suitable for [[aerobraking]] and using [[parachutes]], useful for saving on fuel when spacecraft return to Kerbin.  Note that debris is not affected by air resistance above approximately 10 km, so spent stages may continue in a stable orbit even if they are going through thick atmosphere that would stop an active craft (0.19).
+
The average [[w:Molecular_mass|molecular weight]] of Kerbin air is 28.9644&nbsp;g/mol, and its [[w:Heat_capacity_ratio|adiabatic index]] is 1.40.  This suggests that Kerbin likely has an earthlike nitrogen-oxygen atmosphere.  The air-fuel ratio of jet engines operating in Kerbin's atmosphere suggests that the percentage of oxygen is similar to that of [[w:Atmosphere_of_Earth|Earth's atmosphere]] (about 21%).
  
−
The following table gives approximation of terminal velocities at different Kerbin altitudes. These are also the velocities at which a ship should travel for a fuel-optimal ascent from Kerbin, given the game's model of atmospheric drag (0.18.1).<ref>http://forum.kerbalspaceprogram.com/showthread.php/6664-Mini-challenge-max-altitude-with-this-supplied-spacecraft?p=100912&viewfull=1#post100912</ref>
+
Like all other atmospheres in the game, Kerbin's atmosphere fades exponentially as altitude increases. The [[w:Scale_height|scale height]] varies with altitude, which is a change from pre-1.0 [[Version_history|versions]] of the game.  The pressure-altitude profile is globally constant and independent of temperature.  The following table gives the atmospheric pressure and density at various altitudes above sea level. Temperature-altitude profile is not globally constant, therefore neither is the density-altitude profile, however variance is slight.
  
 
{| class="wikitable"
 
{| class="wikitable"
 
|-
 
|-
−
! Altitude (m) !! Velocity (m/s)
+
! Altitude (m) !! Pressure (Pa) !! Pressure (atm) !! Density (kg/m^3)
 +
|-
 +
| 0 || 101 325 || 1.000 || 1.225
 +
|-
 +
| 2 500 || 69 015 || 0.681 || 0.898
 +
|-
 +
| 5 000 || 45 625 || 0.450 || 0.642
 +
|-
 +
| 7 500 || 29 126 || 0.287 || 0.446
 +
|-
 +
| 10 000 || 17 934 || 0.177 || 0.288
 
|-
 
|-
−
|     0 || 97.3
+
| 15 000 || 6 726 || 0.066 || 0.108
 
|-
 
|-
−
| 1000 || 110
+
| 20 000 || 2 549 || 0.025 || 0.040
 
|-
 
|-
−
| 3000 || 130
+
| 25 000 || 993.6 || 0.010 || 0.015
 
|-
 
|-
−
| 5000 || 160
+
| 30 000 || 404.1 || 0.004 || 0.006
 
|-
 
|-
−
| 8000 || 215
+
| 40 000 || 79.77 || 0.001 || 0.001
 
|-
 
|-
−
| 10000 || 260
+
| 50 000 || 15.56 || 0.000 || 0.000
 
|-
 
|-
−
| 15000 || 425
+
| 60 000 || 2.387 || 0.000 || 0.000
 
|-
 
|-
−
| 32000 || 2250
+
| 70 000 || 0.000 || 0.000 || 0.000
 
|}
 
|}
 +
 +
Kerbin's atmosphere can be divided into three major layers, comparable to Earth's [[w:Troposphere|troposphere]], [[w:Stratosphere|stratosphere]] and [[w:Mesosphere|mesosphere]].  In the lower and upper layers, temperature decreases as altitude increases, while the middle layer spans of a region of increasing temperature.  The boundary between the lower and middle layers occurs at an altitude of about 16&nbsp;km at low latitudes, and about 9&nbsp;km at high latitudes.  The boundary between the middle and upper layer occurs at an altitude of about 38&nbsp;km.
 +
 +
Air temperatures vary with latitude and time of day.  At the equator, sea level temperatures vary between a nighttime low of 32 °C and a daytime high of 41 °C.  At the poles, the temperature varies between -35&nbsp;°C and -30&nbsp;°C.  The globally averaged sea level temperature is approximately 13.5&nbsp;°C.  Since Kerbin has no axial tilt, there are no seasonal temperature variations.
 +
 +
The atmosphere of Kerbin is patterned after Earth's [[w:U.S._Standard_Atmosphere|U.S. Standard Atmosphere]] (USSA), though with the vertical height scale reduced by 20%.  Kerbin's "base" temperature and atmospheric pressure can be very closely approximated using the [http://www.braeunig.us/space/atmmodel.htm#table4 equations of the USSA], where Kerbin's geometric altitude, z, is converted to Earth's geopotential altitude, h, using the equation:
 +
 +
:<math>h = \frac{7963.75\cdot z}{6371+1.25\cdot z}</math>.
 +
 +
The base temperature is the temperature less latitudinal and diurnal adjustments; it is roughly equal to the global mean temperature.
 +
 +
=== Atmospheric flight ===
 +
The thickness of Kerbin's atmosphere makes it well suited for [[aerobraking]] from a high-speed interplanetary intercept.  The periapsis altitude required for a successful aerocapture depends on the spacecraft's drag characteristics, its approach velocity, and the desired apoapsis of the resulting orbit.  For most conditions, a periapsis altitude of about 30&nbsp;km should result in an aerocapture.
 +
 +
[[Parachute]]s perform well in Kerbin's dense air, allowing landings on both land and water to be accomplished without the aid of propulsion.
 +
 +
Because of the presence of oxygen, [[jet engine]]s can operate in Kerbin's atmosphere. And, together with its thickness, Kerbin's atmosphere is ideally suited for [[aircraft]] flight.
 +
 +
[[File:StationDocking.png|thumbnail|A modified Orbiter 1A prepares to dock with a space station.]]
  
 
== Orbits ==
 
== Orbits ==
−
[[File:Screenshot39.png|thumbnail|left|A Stayputnik Orbiter]]
+
[[File:Sputnik in Kerbin's orbit.png|thumbnail|left|A Sputnik-derived satellite]]
−
[[w:Geosynchronous_orbit|Geosynchronous orbit]] is achieved at an altitude of {{OrbitAltitude | period_s=21600 | mass_kg=5.29157926281091e22 | radius_km=600}} and a speed of {{sigfigs|{{OrbitVelocity | period_s=21600 | mass_kg=5.29157926281091e22 | radius_km=600 |suffix=}}|7}} m/s. From a 70 km low equatorial orbit, the periapsis maneuver requires 676.5 m/s and the apoapsis maneuver requires 434.9 m/s. A [[w:semi-synchronous_orbit|semi-synchronous orbit]] with an orbital period of 1/2 of Kerbin's rotation period (3 hours or 10800 seconds) is achieved at an altitude of {{OrbitAltitude | period_s=10800 | mass_kg=5.29157926281091e22 | radius_km=600}} with an orbital velocity of
 
−
{{sigfigs|{{OrbitVelocity | period_s=10800 | mass_kg=5.29157926281091e22 | radius_km=600 |suffix=}}|7}} m/s.
 
−
<div style="clear:left;"></div>
 
  
−
== Interplanetary Travel ==
+
A [[synchronous orbit]] is achieved with a semi-major axis of {{OrbitAltitude|b=Kerbin|f=k|3=0}}. [[KEO|Kerbisynchronous Equatorial Orbit (KEO)]] (or geostationary), has a circularly uniform altitude of {{OrbitAltitude|b=Kerbin|f=k}} and a speed of {{OrbitVelocity|b=Kerbin}}. From a 70&nbsp;km low equatorial orbit, the periapsis maneuver requires 676.5&nbsp;m/s and the apoapsis maneuver requires 434.9&nbsp;m/s. A synchronous [[w:Tundra orbit|Tundra orbit]] with eccentricity of 0.2864 and inclination of 63 degrees is achieved at 3799.7/1937.7&nbsp;km. Inclination correlates with eccentricity: higher inclined orbits need to be more eccentric, while equatorial orbit may be circular, essentially KEO.
  
−
From the lowest stable orbit around Kerbin (70 km), the amount of delta-V needed to reach the orbits of other celestials is as follows:
+
A [[w:semi-synchronous orbit|semi-synchronous orbit]] with an orbital period of ½ of Kerbin's rotation period (2&nbsp;h&nbsp;59&nbsp;m&nbsp;34.7&nbsp;s or 10774.7&nbsp; seconds) is achieved at an altitude of {{OrbitAltitude|b=Kerbin|f=k|pf=1/2}} with an orbital velocity of {{OrbitVelocity|b=Kerbin|pf=1/2}}. A semi-synchronous [[w:Molniya orbit|Molniya orbit]] with eccentricity of 0.742<ref>“[http://www.uwgb.edu/dutchs/AstronNotes/Orbits0.HTM Some Major Orbit Types]” uses that, [[w:Molniya orbit#References|the Wikipedia article]] mentions 0.74105, and “[http://www.eumetcal.org/euromet/english/satmet/s3220/s3220332.htm Orbital Parameters of a Molniya Orbit]” uses 0.72.</ref> and inclination of 63 degrees can not be achieved, because the periapsis would be 36&nbsp;km below the ground. The highest eccentricity of a semi-synchronous orbit with a periapsis of 70&nbsp;km is 0.693<!---389102957193457747187874683092468355009655955115825698569= (1585.18 + 600-670)/(1585.18 + 600)--> with an apoapsis of 3100.36<!-- (1585.18+600)*2-670-600 -->&nbsp;km.
 +
 
 +
The [[w:Hill sphere|Hill sphere]] (the radius around the planet at which moons are gravitationally stable) of Kerbin is 136 185&nbsp;km, or roughly 227 Kerbin radii.
 +
 
 +
=== Low Kerbin Orbit ===
 +
 +
Space near Kerbin is 70 to 249km, as found in science experiments, so LKO is 70 to 249km.
 +
 
 +
=== High Kerbin Orbit ===
 +
 
 +
Space high  above Kerbin is 250 to ~84000km (end of SOI), as found in science experiments, so HKO is 250 to ~84000km.
 +
 
 +
== Delta-V Requirements ==
 +
From the lowest possible stable orbit around Kerbin (70&nbsp;km), the average amount of delta-V needed to reach other destinations is:
  
 
{| class="wikitable"
 
{| class="wikitable"
−
 
−
!Body
 
−
!colspan="2"|Delta-V
 
 
|-
 
|-
−
| [[Mün]]
+
! Body !! Δv
−
|colspan="2"| ~860 m/s
+
|-
 +
| [[Mun]] || ~860&nbsp;m/s
 +
|-
 +
| [[Minmus]] || ~930&nbsp;m/s
 
|-
 
|-
−
| [[Minmus]]
+
| [[Eve]] || ~1033&nbsp;m/s
−
|colspan="2"| ~930 m/s
 
 
|-
 
|-
−
| [[Eve]]
+
| [[Duna]] || ~1060&nbsp;m/s
−
|colspan="2"| ~1033 m/s
 
 
|-
 
|-
−
| [[Duna]]
+
| [[KEO|Geostationary Orbit]] || ~1120&nbsp;m/s
−
|colspan="2"| ~1060 m/s
 
 
|-
 
|-
−
| [[Moho]]
+
| [[Dres]] || ~1540&nbsp;m/s
−
|colspan="2"| ~1676 m/s
 
 
|-
 
|-
−
| [[Jool]]
+
| [[Moho]] || ~1676&nbsp;m/s
−
|colspan="2"| ~1915 m/s
 
 
|-
 
|-
−
 
+
| [[Jool]] || ~1915&nbsp;m/s
−
| [[Eeloo]]
 
−
|colspan="2"| ~2100 m/s
 
 
|-
 
|-
−
| [[KEO]] (comparison)
+
| [[Eeloo]] || ~2100&nbsp;m/s
−
|colspan="2"| ~1120 m/s
 
 
|-
 
|-
 +
| [[Kerbol]] escape || ~2740&nbsp;m/s
 
|}
 
|}
  
−
== Reference Frames ==
+
== Reference frames ==
 
{{:Kerbin/RefFrame}}
 
{{:Kerbin/RefFrame}}
 +
 +
== KSP 2 ==
 +
=== Surface Research Locations ===
 +
Surface research locations include:
 +
* Grasslands
 +
* Highlands
 +
* Mountains
 +
* Desert
 +
* Ice
 +
* Water
 +
* Beach
 +
 +
=== Maps ===
 +
==== Biomes ====
 +
[[File:kerbin_region_ui.jpg|thumb|none|Kerbin biome map with legend (as of v0.2.1.0 (from Orbital Survey mod))]]
 +
 +
==== Visual map ====
 +
[[File:kerbin_visual.png|thumb|none|Eve visual map (as of v0.2.1.0)]]
 +
[https://i.imgur.com/qpbtPbl.png Kerbin visual map (Imgur)]
 +
  
 
== Gallery ==
 
== Gallery ==
 +
=== [[Kerbal Space Program]] ===
 
<gallery>
 
<gallery>
−
NJ6qJ.jpg                 | A projection map of Kerbin, as of {{version|0.14.1|}} and before (including the old demo).
+
Kerbin ISA Topo 0 21.jpg |Topographical map of Kerbin as of {{version|0.21}}
−
Kerbin color.png           | An accurate full-colour projection map of Kerbin as of {{version|0.14.2|}} to {{version|0.17.1|}}
+
Kerbin map from 0.14.jpg | A projection map of Kerbin, as of [[0.14.1]] and before (including the old demo).
−
KerbinDeltaVMap.png       | A map displaying the delta V needed from/to Kerbin
+
Kerbin color.png | An accurate full-colour projection map of Kerbin as of [[0.14.2]] to [[0.17.1]]
−
Kermmunist_Launch_Site.png | The second launch site (currently unused).
+
KerbinDeltaVMap.png | A map displaying the delta V needed from/to Kerbin
−
Kerbin_mun_minmus.jpg | Kerbin, Mün and Minmus.
+
Kerbin_mun_minmus.jpg | Kerbin, Mun and Minmus.
 +
Kerbin,_Mun,_and_Minmus.jpeg | Kerbin with its two natural satellites, the Mun and Minmus, seen from KEO. Minmus can be seen just above the horizon of Kerbin on the left side of the picture.
 
kerbin map 800.gif | A topographic heightmap of Kerbin made with the ISA MapSat plugin
 
kerbin map 800.gif | A topographic heightmap of Kerbin made with the ISA MapSat plugin
−
Kerbinmun500550km.png     | Kerbin and the Mun, barely visible from ~500,550,000m
+
Kerbinmun500550km.png | Kerbin and the Mun, barely visible from ~500,550,000&nbsp;m
 
Kerbin ISA Topo.png | Topographical image of Kerbin '''from 0.17.1'''. The terrain is slightly different in the latest version.<ref>http://forum.kerbalspaceprogram.com/entry.php/247-A-Brave-New-World</ref>
 
Kerbin ISA Topo.png | Topographical image of Kerbin '''from 0.17.1'''. The terrain is slightly different in the latest version.<ref>http://forum.kerbalspaceprogram.com/entry.php/247-A-Brave-New-World</ref>
−
Kerbin r0 1.png | An unmanned probe on escape trajectory, flying past Kerbin, Mün and Minmus
+
Kerbin r0 1.png | An unmanned probe on escape trajectory, flying past Kerbin, Mun and Minmus
 
KerbalPolar1.png | Kerbin's North Pole
 
KerbalPolar1.png | Kerbin's North Pole
 +
Screenshot255.png | Kerbin's South Pole
 +
Solar eclipse in LKO.jpg | A solar eclipse from low Kerbin orbit (LKO).
 +
Entire kerbin system.jpg | Kerbin and Minmus seen from the surface of the Mun.
 +
KSPKerbalSystem.PNG | Kerbin, Mun, and Minmus in a line, seen from a Minmus landing craft.
 +
KerbinSystemPhoto.png | Another picture of the kerbin system, seen from near-Minmus space
 
</gallery>
 
</gallery>
 +
=== [[Kerbal Space Program 2]] ===
 +
<gallery>
 +
KSP2 Kerbin Horizon.png|The horizon of Kerbin in KSP2.
 +
KSP2 Grass.png|Grass on Kerbin in KSP2.
 +
KSP2 Flowers.png|Flowers on Kerbin in KSP2.
 +
</gallery>
 +
 +
{{SpoilerBox
 +
|description=Easter Eggs Are Shown
 +
|content=
 +
<gallery>
 +
Kermmunist_Launch_Site.png | The second launch site (currently unused).
 +
KEasterEgg.png | Kerbin from above with the Runway Easter Egg
 +
 +
<!--Old Monolith.jpeg doesn't exist; add screenshot of monolith from version 0.13 or older-->
 +
 +
File:Crashed Polar UFO.png | A Crashed UFO on Kerbin's northern ice cap.
 +
</gallery>}}
  
 
== Changes ==
 
== Changes ==
−
;{{Version|0.18|}}
+
;[[1.10]]
−
*Terrain overhaul: Entire planet redo. Deserts, darker and greener grass, islands, darker ocean/water, snow capped mountains. Looks more realistic.
+
*  KSC's grass now changes according to the currently set terrain shader quality.
−
*Several [[List of easter eggs|Easter Eggs]] added.
+
;[[1.2]]
−
*Airport added to island off of KSC coastline. (Not a launching point)
+
* Added biomes.
−
;{{Version|0.17|}}
+
;[[1.0.5]]
 +
* Kerbin spun up to have a 6&nbsp;hour synodic day.
 +
;[[0.90]]
 +
* Updated biomes.
 +
;[[0.22]]
 +
* Biomes added.
 +
;[[0.21]]
 +
* Terrain revised to produce more detailed and interesting landforms.
 +
;[[0.19.1]]
 +
* Fixed ladders on the fuel tanks near the launchpad.
 +
;[[0.19]]
 +
* New mesh for the launchpad and area (no launchtower anymore).
 +
* New mesh for the runway, with lights and sloping edges for rovers.
 +
;[[0.18]]
 +
* Terrain overhaul: Entire planet redo. Deserts, darker and greener grass, islands, darker ocean/water, snow capped mountains. Looks more realistic.
 +
* Several [[List of easter eggs|Easter Eggs]] added.
 +
* Airport added to island off of KSC coastline. (Not a launching point)
 +
;[[0.17]]
 
* Improved atmosphere visuals.   
 
* Improved atmosphere visuals.   
−
;{{Version|0.15|}}
+
;[[0.15]]
−
* [[Minmus]] added.
+
* [[Minmus]] was added.
−
;{{Version|0.14.2|}}
+
;[[0.14.2]]
−
* Much more varied and taller terrain added. Prior to this, some mountain ranges exceeded 600 m in height, but the tallest point was at an altitude of approximately 900 m.
+
* Much more varied and taller terrain was added. Prior to this, some mountain ranges exceeded 600&nbsp;m in height, but the tallest point was at an altitude of approximately 900&nbsp;meters.
−
;{{Version|0.12|}}
+
;[[0.12]]
−
* [[Mün]] added.
+
* [[Mun]] added.
−
;{{Version|0.11|}}
+
;[[0.11]]
 
* Terrain overhaul, oceans became wet.
 
* Terrain overhaul, oceans became wet.
−
;{{Version|0.10.1|}}
+
;[[0.10.1]]
−
* Atmosphere extended from ~34,500 m to ~69,000 m.
+
* Atmosphere extended from ~34,500&nbsp;m to ~69,000&nbsp;m.
−
;{{Version|?|}}
+
;[[0.7.3]]
 
* Initial Release
 
* Initial Release
 +
 +
== Trivia ==
 +
* Kerbin's continents are derived from libnoise<ref>http://libnoise.sourceforge.net/examples/complexplanet/</ref>, a coherent noise generating library, though they have been increasingly modified with time.
 +
 +
* Before 0.90 Kerbin was one of the few bodies with multiple [[Biome]]s. Following the 0.90 update all celestial bodies have biomes.
 +
 +
[[File:KerbinBiomeMap.png|left|thumb|The biomes on Kerbin as of 0.90]]
 +
 +
* The quote from the [[Kerbal Astronomical Society]] is true. in real life (and in Kerbal Space Program), during a one-way interplanetary mission, half the delta v is expended on orbit.
 +
=== Real-world comparison ===
 +
Kerbin has approximately one-tenth the radius of Earth and 1/113th the mass.
 +
 +
== See also ==
 +
* [[List of bases on Kerbin]]
 +
* [[Kerbal Space Center]]
 +
* [[Inland Kerbal Space Center]]
 +
* [[Island Airfield]]
 +
* [[Woomerang Launch Site]]
 +
* [[Dessert Launch Site]]
 +
* [[Dessert Airfield]]
  
 
== Notes ==
 
== Notes ==
 
<references />
 
<references />
−
 
  
 
{{Celestial Bodies}}
 
{{Celestial Bodies}}
−
{{Languages}}
 
 
[[Category:Celestials]]
 
[[Category:Celestials]]
 
[[Category:Planets]]
 
[[Category:Planets]]

Latest revision as of 23:46, 16 October 2024

Kerbin
Kerbin
Kerbin as seen from orbit.
Planet of Kerbol
Orbital Characteristics
Semi-major axis 13 599 840 256 m [Note 1]
Apoapsis 13 599 840 256 m [Note 1]
Periapsis 13 599 840 256 m [Note 1]
Orbital eccentricity 0
Orbital inclination 0 °
Argument of periapsis 0 °
Longitude of the ascending node 0 °
Mean anomaly 3.14 rad (at 0s UT)
Sidereal orbital period 9 203 545 s
426 d 0 h 32 m 24.6 s
Synodic orbital period Not defined
Orbital velocity 9 285 m/s
Physical Characteristics
Equatorial radius 600 000 m
Equatorial circumference 3 769 911 m
Surface area 4.5238934×1012 m2
Mass 5.2915158×1022 kg
Standard gravitational parameter 3.5316000×1012 m3/s2
Density 58 484.090 kg/m3
Surface gravity 9.81 m/s2 (1 g)
Escape velocity 3 431.03 m/s
Sidereal rotation period 21 549.425 s
5 h 59 m 9.4 s
Solar day 21 600.000 s
5 h 59 m 60 s
Sidereal rotational velocity 174.94 m/s
Synchronous orbit 2 863.33 km
Sphere of influence 84 159 286 m [Note 1]
Atmospheric Characteristics
Atmosphere present Yes
Atmospheric pressure 101.325 kPa
1 atm
Atmospheric height 70 000 m
1.0×10-6 atm
Temperaturemin -86.20 °C 186.95 K
Temperaturemax 15 °C 288.15 K
Oxygen present Yes
Scientific multiplier
Surface 0.3
Splashed 0.4
Lower atmosphere 0.7
Upper atmosphere 0.9
Near space 1
Outer space 1.5
Recovery 1
  1. ↑ 1.0 1.1 1.2 1.3 The distances are given from the body's center, not from the surface (unlike ingame)

Kerbin is the home planet of the Kerbals, the location of the Space Center and other facilities, and the main focus of Kerbal Space Program. It is also the Earth analog for the game but, unlike Earth, it has two moons instead of one. They are named the Mun and Minmus. It is the planet you start your game on, being home to the KSC, where you construct and launch your vehicles on.

Kerbin, the home planet in Kerbal Space Program, boasts two natural satellites: the larger Mun and the smaller Minmus. The Mun, resembling Earth's moon, is characterized by its gray, cratered surface, offering ample opportunities for exploration and scientific research. In contrast, Minmus is a unique celestial body with a mint-green hue and low gravity, making it an ideal location for mining operations and testing advanced rover technologies. Both moons orbit Kerbin in slightly eccentric orbits, providing players with diverse challenges and objectives for their space missions.

Kerbin is the third planet in orbit around the star Kerbol. It is the third largest celestial body that orbits Kerbol, following Jool and Eve. Jool's moon, Tylo has the same radius of Kerbin, though it may be classified as larger, as the highest point on Tylo is about 5 km higher than the highest point on Kerbin. However, Tylo has only 80% of Kerbin's mass.

Reaching a stable orbit around Kerbin is one of the first milestones a player might achieve in the game. With the introduction of version 1.0.3, attaining low Kerbin orbit requires a Δv of approximately 3400 m/s, though the exact amount depends on the efficiency of the ascent profile and the aerodynamics of the launch vehicle and payload. The only rocky planet that requires a higher Δv to attain orbit is Eve due to its dense atmosphere and higher gravity. Many interplanetary missions expend over half of their Δv in reaching Kerbin orbit. The velocity required to escape a body from a given altitude is always exactly the square root of two, times the velocity of a circular orbit around the body at that height: .

In-game description

KSP 1:

“ A unique world, Kerbin has flat plains, soaring mountains and wide, blue oceans. Home to the Kerbals, it has just the right conditions to support a vast, seemingly undepletable population of the eager green creatures.


Reaching a stable orbit around Kerbin is one of the first things budding space programs strive for. It is said that those who can get their ship into orbit are halfway to anywhere.''

— Kerbal Astronomical Society

 ”

KSP 2:

“ Even as rockets and probes escape its atmosphere for deep space exploration, there is still much to appreciate about this vibrant world. Its vast oceans, deserts, forests, and plains coat the surface in lively beauty. Its moons, Mun and Minmus, swirl silently above it. Kerbalkind is fortunate to call this pale blue planet their home. ”

Topography

Topographical representation of Kerbin's surface as of 0.18.2. Click for high resolution. by Zeroignite
Kerbal at Kerbin's highest peak(old)
A Kerbal at Kerbin's highest peak(1.12.2)

Kerbin has a roughly equal distribution of liquid surface water and solid land, with polar ice caps and scattered deserts. Some of its mountains exceed 6 kilometers in height, with the tallest peak being 6767.4 m in altitude at the coordinates 46°21'32" E 61°35'53" N. The lowest point is almost 1.4 km deep and about 313° south-west of the Kerbal Space Center.

Craters

Terrain model centered on Kerbin's most pronounced craters

Unlike other bodies in its system, Kerbin has few visible craters because its environment would erode craters from the few meteors that avoid the gravity or surface of its large moon and survive entry. Nevertheless, some geological formations indicate that bodies have violently collided with Kerbin: a planetary feature appears to be an impact crater, while a secondary rupture lies on the other side of the planet (made by the intense longitudinal, or P-wave earthquakes that ensue.) Both are in excess of 100 km diameter, and the main crater lies along the far-western coastline. The uplift is easily visible as a series of islands, and the feature has a central peak that pokes up through the water (also known as a rebound peak.) The other, and smaller of the two, is near the prime meridian in the northern hemisphere and is more easily missed, but its uplift rims are visible, and it also has a central rebound peak.

Biomes

After the Mun, Kerbin is the celestial body with the second-highest number of biomes. Science experiments can be performed in all biomes, though Kerbin's low multipliers result in less impressive results than more distant worlds. Kerbin's biomes show a loose correlation with Earth's biomes and geographic features. Uniquely, Kerbin has 33 location biomes at KSC, these are comprised of each building and their props, the crawlerway, the flag, and KSC itself; these give a jumpstart to gathering Science points in Career mode. With 1.2 Kerbin had distinct Northern and Southern Ice Shelves added.

Kerbin biome map as of 1.2

List of biomes

  • Ice Caps
  • Northern Ice Shelf
  • Southern Ice Shelf
  • Tundra
  • Highlands
  • Mountains
  • Grasslands
  • Deserts
  • Badlands
  • Shores
  • Water

KSC mini biomes

Atmosphere

Temperature and pressure of Kerbin's atmosphere as a function of altitude.
Drag force is proportionate to atmospheric density.
File:Measures of Kerbin's atmospheric pressure
Measures of Kerbin's atmospheric pressure

Kerbin has a thick, warm atmosphere with a mass of approximately 4.7×1016 kilograms, a sea level pressure of 101.325 kilopascals (1 atmosphere), and a depth of 70,000 meters. The atmosphere contains oxygen and can support combustion. Kerbin is one of the two celestial bodies (the other one being Laythe) with a breathable atmosphere.

The average molecular weight of Kerbin air is 28.9644 g/mol, and its adiabatic index is 1.40. This suggests that Kerbin likely has an earthlike nitrogen-oxygen atmosphere. The air-fuel ratio of jet engines operating in Kerbin's atmosphere suggests that the percentage of oxygen is similar to that of Earth's atmosphere (about 21%).

Like all other atmospheres in the game, Kerbin's atmosphere fades exponentially as altitude increases. The scale height varies with altitude, which is a change from pre-1.0 versions of the game. The pressure-altitude profile is globally constant and independent of temperature. The following table gives the atmospheric pressure and density at various altitudes above sea level. Temperature-altitude profile is not globally constant, therefore neither is the density-altitude profile, however variance is slight.

Altitude (m) Pressure (Pa) Pressure (atm) Density (kg/m^3)
0 101 325 1.000 1.225
2 500 69 015 0.681 0.898
5 000 45 625 0.450 0.642
7 500 29 126 0.287 0.446
10 000 17 934 0.177 0.288
15 000 6 726 0.066 0.108
20 000 2 549 0.025 0.040
25 000 993.6 0.010 0.015
30 000 404.1 0.004 0.006
40 000 79.77 0.001 0.001
50 000 15.56 0.000 0.000
60 000 2.387 0.000 0.000
70 000 0.000 0.000 0.000

Kerbin's atmosphere can be divided into three major layers, comparable to Earth's troposphere, stratosphere and mesosphere. In the lower and upper layers, temperature decreases as altitude increases, while the middle layer spans of a region of increasing temperature. The boundary between the lower and middle layers occurs at an altitude of about 16 km at low latitudes, and about 9 km at high latitudes. The boundary between the middle and upper layer occurs at an altitude of about 38 km.

Air temperatures vary with latitude and time of day. At the equator, sea level temperatures vary between a nighttime low of 32 °C and a daytime high of 41 °C. At the poles, the temperature varies between -35 °C and -30 °C. The globally averaged sea level temperature is approximately 13.5 °C. Since Kerbin has no axial tilt, there are no seasonal temperature variations.

The atmosphere of Kerbin is patterned after Earth's U.S. Standard Atmosphere (USSA), though with the vertical height scale reduced by 20%. Kerbin's "base" temperature and atmospheric pressure can be very closely approximated using the equations of the USSA, where Kerbin's geometric altitude, z, is converted to Earth's geopotential altitude, h, using the equation:

.

The base temperature is the temperature less latitudinal and diurnal adjustments; it is roughly equal to the global mean temperature.

Atmospheric flight

The thickness of Kerbin's atmosphere makes it well suited for aerobraking from a high-speed interplanetary intercept. The periapsis altitude required for a successful aerocapture depends on the spacecraft's drag characteristics, its approach velocity, and the desired apoapsis of the resulting orbit. For most conditions, a periapsis altitude of about 30 km should result in an aerocapture.

Parachutes perform well in Kerbin's dense air, allowing landings on both land and water to be accomplished without the aid of propulsion.

Because of the presence of oxygen, jet engines can operate in Kerbin's atmosphere. And, together with its thickness, Kerbin's atmosphere is ideally suited for aircraft flight.

A modified Orbiter 1A prepares to dock with a space station.

Orbits

A Sputnik-derived satellite

A synchronous orbit is achieved with a semi-major axis of 3 463.33 km. Kerbisynchronous Equatorial Orbit (KEO) (or geostationary), has a circularly uniform altitude of 2 863.33 km and a speed of 1 009.81 m/s. From a 70 km low equatorial orbit, the periapsis maneuver requires 676.5 m/s and the apoapsis maneuver requires 434.9 m/s. A synchronous Tundra orbit with eccentricity of 0.2864 and inclination of 63 degrees is achieved at 3799.7/1937.7 km. Inclination correlates with eccentricity: higher inclined orbits need to be more eccentric, while equatorial orbit may be circular, essentially KEO.

A semi-synchronous orbit with an orbital period of ½ of Kerbin's rotation period (2 h 59 m 34.7 s or 10774.7  seconds) is achieved at an altitude of 1 581.76 km with an orbital velocity of 1 272.28 m/s. A semi-synchronous Molniya orbit with eccentricity of 0.742[1] and inclination of 63 degrees can not be achieved, because the periapsis would be 36 km below the ground. The highest eccentricity of a semi-synchronous orbit with a periapsis of 70 km is 0.693 with an apoapsis of 3100.36 km.

The Hill sphere (the radius around the planet at which moons are gravitationally stable) of Kerbin is 136 185 km, or roughly 227 Kerbin radii.

Low Kerbin Orbit

Space near Kerbin is 70 to 249km, as found in science experiments, so LKO is 70 to 249km.

High Kerbin Orbit

Space high above Kerbin is 250 to ~84000km (end of SOI), as found in science experiments, so HKO is 250 to ~84000km.

Delta-V Requirements

From the lowest possible stable orbit around Kerbin (70 km), the average amount of delta-V needed to reach other destinations is:

Body Δv
Mun ~860 m/s
Minmus ~930 m/s
Eve ~1033 m/s
Duna ~1060 m/s
Geostationary Orbit ~1120 m/s
Dres ~1540 m/s
Moho ~1676 m/s
Jool ~1915 m/s
Eeloo ~2100 m/s
Kerbol escape ~2740 m/s

Reference frames

Time warp Minimum Altitude
1× Any
5× 70 000 m (above the atmosphere)
10× 70 000 m (above the atmosphere)
50× 70 000 m (above the atmosphere)
100× 120 000 m
1 000× 240 000 m
10 000× 480 000 m
100 000× 600 000 m

KSP 2

Surface Research Locations

Surface research locations include:

  • Grasslands
  • Highlands
  • Mountains
  • Desert
  • Ice
  • Water
  • Beach

Maps

Biomes

Kerbin biome map with legend (as of v0.2.1.0 (from Orbital Survey mod))

Visual map

File:Kerbin visual.png
Eve visual map (as of v0.2.1.0)

Kerbin visual map (Imgur)


Gallery

Kerbal Space Program

  • Topographical map of Kerbin as of version 0.21

  • A projection map of Kerbin, as of 0.14.1 and before (including the old demo).

  • An accurate full-colour projection map of Kerbin as of 0.14.2 to 0.17.1

  • A map displaying the delta V needed from/to Kerbin

  • Kerbin, Mun and Minmus.

  • Kerbin with its two natural satellites, the Mun and Minmus, seen from KEO. Minmus can be seen just above the horizon of Kerbin on the left side of the picture.

  • A topographic heightmap of Kerbin made with the ISA MapSat plugin

  • Kerbin and the Mun, barely visible from ~500,550,000 m

  • Topographical image of Kerbin from 0.17.1. The terrain is slightly different in the latest version.[2]

  • An unmanned probe on escape trajectory, flying past Kerbin, Mun and Minmus

  • Kerbin's North Pole

  • Kerbin's South Pole

  • A solar eclipse from low Kerbin orbit (LKO).

  • Kerbin and Minmus seen from the surface of the Mun.

  • Kerbin, Mun, and Minmus in a line, seen from a Minmus landing craft.

  • Another picture of the kerbin system, seen from near-Minmus space

Kerbal Space Program 2

  • The horizon of Kerbin in KSP2.

  • Grass on Kerbin in KSP2.

  • Flowers on Kerbin in KSP2.

Spoiler: Easter Eggs Are Shown

  • The second launch site (currently unused).

  • Kerbin from above with the Runway Easter Egg

  • A Crashed UFO on Kerbin's northern ice cap.

Changes

1.10
  • KSC's grass now changes according to the currently set terrain shader quality.
1.2
  • Added biomes.
1.0.5
  • Kerbin spun up to have a 6 hour synodic day.
0.90
  • Updated biomes.
0.22
  • Biomes added.
0.21
  • Terrain revised to produce more detailed and interesting landforms.
0.19.1
  • Fixed ladders on the fuel tanks near the launchpad.
0.19
  • New mesh for the launchpad and area (no launchtower anymore).
  • New mesh for the runway, with lights and sloping edges for rovers.
0.18
  • Terrain overhaul: Entire planet redo. Deserts, darker and greener grass, islands, darker ocean/water, snow capped mountains. Looks more realistic.
  • Several Easter Eggs added.
  • Airport added to island off of KSC coastline. (Not a launching point)
0.17
  • Improved atmosphere visuals.
0.15
0.14.2
  • Much more varied and taller terrain was added. Prior to this, some mountain ranges exceeded 600 m in height, but the tallest point was at an altitude of approximately 900 meters.
0.12
0.11
  • Terrain overhaul, oceans became wet.
0.10.1
  • Atmosphere extended from ~34,500 m to ~69,000 m.
0.7.3
  • Initial Release

Trivia

  • Kerbin's continents are derived from libnoise[3], a coherent noise generating library, though they have been increasingly modified with time.
  • Before 0.90 Kerbin was one of the few bodies with multiple Biomes. Following the 0.90 update all celestial bodies have biomes.
The biomes on Kerbin as of 0.90
  • The quote from the Kerbal Astronomical Society is true. in real life (and in Kerbal Space Program), during a one-way interplanetary mission, half the delta v is expended on orbit.

Real-world comparison

Kerbin has approximately one-tenth the radius of Earth and 1/113th the mass.

See also

Notes

  1. ↑ “Some Major Orbit Types” uses that, the Wikipedia article mentions 0.74105, and “Orbital Parameters of a Molniya Orbit” uses 0.72.
  2. ↑ http://forum.kerbalspaceprogram.com/entry.php/247-A-Brave-New-World
  3. ↑ http://libnoise.sourceforge.net/examples/complexplanet/
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