Orbiter Space Flight Simulator

Orbiter is a space flight simulator based on Newtonian mechanics. Its playground is our solar system with many of its major bodies - the sun, planets and moons. You take control of a spacecraft - either historic, hypothetical, or purely science fiction. Orbiter is unlike most commercial computer games with a space theme - there are no predefined missions to complete (except the ones you set yourself), no aliens to de-stroy and no goods to trade. Instead, you will get a pretty good idea about what is in-volved in real space flight - how to plan an ascent into orbit, how to rendezvous with a space station, or how to fly to another planet. It is more difficult, but also more of a challenge. Some people get hooked, others get bored. Finding out for yourself is easy - simply give it a try. Orbiter is free, so you don't need to invest more than a bit of your spare time.