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Most of this page is entirely speculation based on in-game observation and should not be taken as absolute fact!
Kerbal astronaut in EVA

Kerbals are the native denizens of the planet Kerbin, and the game analog for humankind. Kerbals appear to be bipedal. Mature kerbals stand roughly 0.75 meters in height, and weigh approximately 90 kilograms.

Kerbals have a massive head with respect to their bodies, being nearly 50% of an adult kerbal's body mass.


Kerbal from Kerbalizer

Although Kerbals appear mostly hairless, they have notable hair growth occurring chiefly on the top of the head. Their skin hues appear to range from light green to pale green. As far as can be seen via artwork and ingame modeling, Kerbals appear to have two, large teeth that span the length of their gums. One on the mandible, and one on the skull.

They are capable of spending years in space without showing any signs of muscle atrophy or other ill effects and can survive for years with minimal or no food and oxygen supply. There are various theories why this is possible:

  • One theory is that they are able to enter a state of hibernation to endure long space travels. This is unlikely, as they appear always awake when controlling the craft.
  • Another theory is that their green skin may contain chlorophyll allowing them to photosynthesize their own food.
  • They may also not need oxygen to breathe, as they have no nose and can survive with their mouth closed.
  • Some sources have proposed that a Kerbals sustenance might mainly consist of Mountain Dew and Sandwiches.

Anecdotal evidence in the descriptions of the Rockomax Hubmax Multi-Point Connector and the RoveMax Model 3 suggest that Kerbals are prone to dying from shock when exposed to unexpected technological innovations. For some reason this doesn't seem to apply to innovative rocket concepts. These usually kill them in other ways.

Judging by their names, everybody, at least the ones approved to go into space, seem to be male. They might also be genderless.

Kerbal corneas protrude from the eyeball significantly, as do their eyes from the skull. In addition, they also possess no eyelids, making their eyes a vulnerable spot for injuries. Kerbals appear to lack any irises, meaning that their eyes are very sensitive to bright lights. This may support the theory that Kerbals live underground.

Kerbals have an awkward, sprawling walk due to their wide pelvis and short legs, indicating that their species may not have evolved to walk originally, and that it is something they learned recently.
A Kerbal's walking speed on Kerbin is about 0.87m/s, it's running speed is about 2.35m/s.


  • Kerbals can speak, as of some recent trailers. Currently they do not speak in-game.
    • However, they do emit sounds like "aha" in-game, during the tutorials.
  • In trailers they speak reverse Spanish.

Material culture and technology

Limited observation makes this difficult to determine. The technology and architecture appears to share many similarities with the modernized nations of Earth during the 1970-2000's, however no city landscapes currently exist (0.21.1[outdated]).

One theory on the scarcity of buildings on Kerbin could be related to the lack of wildlife and trees on the planet. Kerbal civilisation may live underground or underwater due to some unknown factor.

Due to the humorous descriptions of parts in-game, it can be assumed Kerbals are, to some extent, less intelligent and more foolish than Human Beings. Kerbals usually find planets by accident, often involving what was thought by its discoverer to be a piece of dust or a smudge on the lens. It appears that their culture revolves singly around the process of designing, building, launching, and riding rockets and planes. Every modern Kerbal made structure on Kerbin is devoted to these four tasks.

The most prominent properties are their stupidity and bravery, as those are the only properties, except the name, visible in the Astronaut Complex.

Kerbals seem to be in infinite supply, perhaps everyone wants to be a kerbonaut, the Kerbal Space Command has a great recruiting program or the planet Kerbin itself spews out the little green men (0.20.2[outdated]).


See also