Tofte Simulators
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Space flight
The Nearest Star
How it works, and what it shows:
read the note on the blog
.
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The Explorer
The ship on the black hole drive, flown past everything as fast as it goes, and its door home.
Wormhole Stations
Put a station at every star within 12 light years and see whether you built a time machine.
Closest Approach
Sample an asteroid's close pass, then refine it, and see why the closest sample is not the closest approach.