Tofte Simulators

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Space flight

Closest Approach

How it works, and what it shows: read the note on the blog.

Try next

Fusion Nozzle Drag the one unmeasured number the nozzle's mass hangs on and watch it swallow the ship.
Ship Race Every version of the fusion ship, and yours, drawn to its own size, launched and raced.
Air Brake Put a heat shield on the ship and let Mars's air do the braking.

Every simulator runs on our own engine and shows its working. The notes on the blog explain how they work.