I think most people know it is by the gravity, so what is gravity? How
it works? The gravity which is a kind of energy to made the objects be
gathered to the center. It is produced by the earth. So that's why we
can see the rocks on the mount was go down not go up and the rivers
brought the mud from the higher place to a lower place ( the river also
will be affected by the gravity). Furthermore, maybe you don't even
know, how will determine the power of gravity. Actually, it was
determined by many aspects, including the mass of the planet. So we know
earth is a huge planet and it has higher gravity. To be imagined,
that's why the spaceman will lose the control of gravity on some other
small planets.
Now, there is a question come up " how do we conquer the law of gravitation"? Since the ancient times, humans always had flying myths and legends to fly.
Why do humans can't fly off the ground? Is the lack of a pair of wings? But many of the brave attempt, to imitate birds with artificial wings flying was failed. After a bunch of the attempts, the people realized that the speed is the only way to get rid of the attracts by earth. But the speed we need is 16km/s
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