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Q&A How close an orbit could you get to Earth with a planet-sized object/ship without severely disrupting Earth's orbit?

My idea involves an alien spaceship inside a roughly Earth to Mars sized/massed planet, but the whole planet is displaced when the drive is activated. If you wanted to travel back to our solar syst...

3 answers  ·  posted 4y ago by DWKraus‭  ·  last activity 4y ago by DWKraus‭

Question space travel spaceships orbital-mechanics space-travel ships