By flying close to an object like an asteroid a spacecraft can tug on it with a miniscule amount of force. Over long periods of time such a process can be used to deflect incoming asteroids or even place one safely in Earth orbit. Could a future Earth have a second (or third) moon? Will the Solar System be filled with gravity tugs constantly ferrying asteroids?
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Speculative Fact contributions are researched and written by Jonathan Hernandez and Rob Cameron
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