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By using the law of action and reaction.

The rockets that launch spacecraft expel huge amounts of hot gas from burning fuel out of their exhausts, and this pushes the rocket (vehicle) upward in a rapid acceleration. This is necessary to overcome the force of gravity that pulls down on everyone and everything on the Earth. When the spacecraft is moving fast enough (escape velocity), it is able to enter an orbit around the Earth. From orbit, spacecraft can use smaller rockets to leave Earth entirely, and travel to the Moon or to other planets.

The limit to this is that you need to use lots of energy to get to space, and even more to go anywhere else. All of the fuel has to lift its own weight as well as the craft (payload), so this takes very large rockets and huge amounts of fuel.

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Q: How are spacecraft able to launch into space?
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