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The reason why there is gravity on Earth, is because of its mass. Mass is the space that it takes up. Due to the size of the Earth, there is a downward force of 1 G. Gs are measured in Earth's gravity. Also, the reason why there is little gravity on the moon is because it is smaller than the Earth.
on March 17
Well because, if we didn't have gravity we wouldn't have air and if we didn't air we wouldn't breathe and we don't breathe we die and we die we never exist :3
on August 28, 2014
If there was no gravity, you would drift off into with no way of moving. Also, your muscles would waste away and all the problems astronauts get in space would happen. The Earth has gravity because it's a planet, so it's big enough to have its own gravity field.
on July 27, 2014