If you throw a ball into the air, it will fall back towards the earth due to gravity. However, in space if you throw the ball, it will not come back due to the lack of gravity.
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Gravity is a force that pulls objects to the earth, and keeps moons orbiting around planets and planets around suns. The moon's gravitational pull is the reason as to why we experience tides. The more mass an object has, the more gravitational pull it has. If you were to enter Jupiter's atmosphere, you would be crushed due to the large amount of gravity, which occurs because the planet has a massive mass.
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