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One thing about being in space it that most of the time, there will be zero gravity. Gravity is what pulls us to the center of the Earth. Space has gravity, it is just very weak as you get further away. As you get further away from Earth, you get closer to another celestial body, such as Mars. Even though mars has low gravity, it still has gravity. After earths gravity is too weak we start to get pulled in by Mars's gravity, even though there is very low gravity.