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Just another thing to add and you should consider. To escape from Earth you need to reach escape velocity which is a function of the mass of an object. Earths escape velocity is around 11km/sec. If an object fails to reach this speed it falls back to earth. This is the force of gravity in action it pulls. There is nothing that pushes it back down. That is simple Newtonian gravity in action. Although now relativistic gravity is the more accepted theory the notion is for attraction not pushing.
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