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> In fact, given the almost negligible gravity of the comet’s 4 km-wide nucleus, Philae will have to use ice screws and harpoons to stop it from rebounding back into space after touchdown.

That sounds a bit like a mod for the game Kerbal Space Program (KSP). There is a planet called Inaccessible which has an equatorial rotation speed greater than the escape velocity. As such to 'land' you need to continuously be thrusting towards the planet (as opposed to away to slow your descent) - or just land at the poles.




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