The Sun and the Planets of the Solar System formed from a huge cloud of gas and tiny solid particles about 4600 million years ago. Small planets like the Earth lost a lot of Hydrogen into space, but the giant planets kept all of theirs.
The pull of gravity of the giant planets is much stronger than that of the Earth. A person standing on Jupiter (supposing it had solid surface) would feel three times as heavy. This pull of gravity prevents the hydrogen from escaping into space. Hydrogen makes up about 90 percent of giant planets.
No comments:
Post a Comment