Science games

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Games:

 * Biogenesis - Simulates evolution with various creatures mutating and evolving so they can better survive. The user can create custom creatures and can influence the environment by nourishing certain organisms.
 * Boxcar 2d - Similar to Biogenesis, except that different cars evolve to go the furthest distance in the shortest amount of time.
 * Celestia
 * EVE online
 * Flow
 * Kerbal Space Program - A relatively simple space sim with newtonian physics and custom spaceship construction.
 * Lunar Flight
 * Moonbase Alpha
 * Orbiter Space Simulator
 * Phun
 * Piette's falling sand game
 * Pioneer
 * Powder toy - Gives the user a big toybox of elements and lets him play with them as he wishes.
 * Spacechem - A puzzle game that tests and teaches basic concepts of computer engineering.
 * SpaceEngine - A space exploration game where one can explore the entire Virgo supercluster.
 * Space Station 13