[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/space_travel_1969.png]]
[[caption-width-right:350:The system, and the game itself. [[note]]Part of [[https://www.slideshare.net/aleinikovak/unixpart1history Slideshare presentation.]][[/note]]]]
''Space Travel'', written by Ken Thompson on a [[Platform/MainframesAndMinicomputers Multics system]] in 1969, is a TopDownView 2D SimulationGame of flight around our solar system. You fly a spaceship, flying to and landing on the planets and their moons. It's a WideOpenSandbox with no goals or enemies. Just fly around. Each planet and moon exert a gravitational pull on your ship, changing its trajectory. Sizes, masses, and distances of of the planets and moons are all depicted realistically. Planets and moons follow orbits, but not realistically; the orbits are perfect circles and all on the same plane.

It's of historical interest because Thompson and Dennis Ritchie invented Platform/{{UNIX}} to port it to an unused DEC PDP-7. In that sense, it may be the most influential video game ever developed. You're most likely reading this page because of it.

!!''Space Travel'' provides examples of:

* InUniverseGameClock: The planets and moons following their orbits.
* NoPlotNoProblem
* RagdollPhysics
* SimulationGame
* TopDownView
* WideOpenSandbox: Probably the UrExample.
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