Difference between revisions of "Science"

Revision as of 16:29, 30 October 2013

The first few stages of the Tech tree, showing the unlock system

Science, sometimes called science points, is needed to unlock new parts in the tech tree. It is obtained by performing different scientific activities at different locations and then either returning to Kerbin and recovering the craft or sending your scientific analysis home through an antenna.

Science activities

This is an overview of all science activities which can be performed. Most activities are restricted to certain heights. Currently^[outdated] the planet Kerbin and its moon Mun are divided into different biomes. On some heights, some experiments return different results per biome.

Surface Samples

Surface samples can be taken by Kerbonauts when performing an EVA on the ground (or in the oceans) of a celestial body. The results vary by biome.

EVA Reports

EVA reports are done by Kerbonauts on an EVA. Like crew reports they give different results depending on altitude and biome if performed low enough.

In contrast to crew reports and experiments, a Kerbonaut can memorize a different report for each condition he performed an EVA in during the mission.

Crew Reports

Crew reports can be created in every manned command pod. Each command pod can only store one report at a time (Kerbonauts seem to be unable to memorize more than one at a time), but they can be sent home with an antenna without penalty allowing the crew to create a new one.

Crew reports differ between current celestial body, altitude, and at low altitudes also between different biomes.

Experiments

Experiments are parts like the Mystery Goo Containment Unit and behave similar to crew reports. They can be performed in different flight phases and on different celestial bodies returning different results. The biome, however, does not affect them unless the vessel has landed. Just like crew reports, each experiment part can only store one result at a time, but a result can be sent home with an antenna to allow the experiment to be performed again under the same or under new conditions. There is a penalty for sending it home instead of recovering the performed experiment, but when the craft has a steady supply of electricity to supply its antenna this doesn't matter much because an experiment can be repeated indefinitely resulting in the same science output as would be possible through recovery.

Craft recovery

Recovering a craft after it landed on Kerbin also yields science points by itself. Its value depends on how far the craft flew. Recovering a craft after a suborbital flight returns less valuable (but different) results than one which orbited the Mun, for example. The returned value appears to be 5 * (surfaces visited + bodies orbited).

Celestial body multipliers

Each celestial body has different multipliers applied to the collected scientific data, based upon where it is taken in relation to that body. Biomes do not affect these multipliers. The only exception is Kerbin on the surface for the KSC, runway, and launch pad where the multiplier is 0.3 instead of 0.4.

Repeating experiments

Performing the same activity multiple times in the same environment yields additional science points, but with diminishing returns each time the activity is repeated.

When an experiment is recovered after landing on Kerbin, its scientific value is reduced by 80% of its current value when it is performed again under the same conditions.

When it is transmitted instead, this reduction is reduced by the transmission efficiency.

${\displaystyle y=S\cdot M\cdot T(1-{\frac {p}{C\cdot M}})=S\cdot T(M-{\frac {p}{C}})}$

As a result it doesn't matter if the player transmits lots of times or returns a few times. In the end the total scientific yield of each experiment on Kerbin will always approach the same maximum value which depends on science type. Roughly speaking, the lower the transmission efficiency, the more times the experiment needs to be run to achieve the same yield as bringing one experiment back to Kerbin.

For example material studies from Kerbin space take about 8 transmissions to yield 99% of the amount of science as a single run of that experiment when recovered on the surface of Kerbin. The transmission efficiency (${\displaystyle t}$) is 0.2 and the science modifier (${\displaystyle m}$) is 1.

Alternative Equation

An alternative form of the above equation is available, which replaces ${\displaystyle p}$ with ${\displaystyle i}$, the number of times the experiment has been performed in the past (${\displaystyle i=0}$ for the first run of the experiment). The equation is:

${\displaystyle y=S\cdot M\cdot T\cdot (1-{\frac {ST}{C}})^{i}}$

This equation is better suited for situations where the total amount of science already gathered is unknown, but the number of experiments previously performed is known. For example, a player may remember that they've been to a Mun site and gathered a sample in the past, but they may not remember how much science they received for it. This equation allows the player to determine how much science they'd receive from a second trip and whether or not it's worth it to them.

Known Bugs

• The Seismic Scan, Gravity Scan and Atmosphere Analysis experiments show more science value in the report window than is retrieved upon recovery or transmission (issue 1578).