version1: The rocket responds to keystrokes.

version2: The rocket can wrap around the edge of the scene.

version3: Hitting the sun is a losing condition.

version4: The sun can apply gravity on the rocket.

version5: Three planets circle around the sun.

version6: The planets, too, add gravity to the three planets.
(To demonstrate that the planets themselves have gravity, the
simulation turns off sun gravity and keeps the planets from spinning.)

version7: Hitting earth is a winning condition.

version8: A satellite rotates around the earth.

version9: Rocket trails follow the rocket's path.

version10: The game responds differently to winning or losing.

version11: A fuel indicator shows how much fuel is left.



Solutions [password protected (why?)]