Every single object in the universe pulls on every other object. This is called gravitation, or gravity. But the strength of that pull depends on two things. Firstly let's take a human being on Earth. But the Earth behaves as if all its matter were at its centre. The strength to gravity at any place, therefore, depends on the distance from the Earth's centre. The strength of gravity is far greater at the seashore than at the top of a mountain. Supposing a human being goes some distance up into the air away from the Earth, the pull of the Earth's gravity will be even weaker. When people go out into space, they are away from the Earth's gravitational field. There is no pull at all. They are in a condition of weightlessness. And thid is why, in rockets and space capsules, weightlessness astronauts and object float about in the air.
FACT FILE
Althoug a bit might seem that gravity carries food and drink down our throats, astonauts are able to eat and drink perfectly well in zero gravity. This is because it is the muscular contractions of the gullet that actually transport food and drink into the stomach.!
resources: Tell me why (Chancellor Press)
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