Regarding black holes: I recently learned that the Schwarzschild radius (where nothing can escape) is not the only interesting limit. There is an "Innermost stable circular orbit" (ISCO) which can be about 3 times as big. From what I've read online, if a point mass gets closer than ISCO then it will spiral into the black hole. But I'm wondering: if I have a spaceship with a strong energy source (e.g. antimatter propulsion) can it get closer than ISCO -- may be even near the Schwarzschild limit -- and still get away?
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