Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
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There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
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The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
If two pieces of metal touch in space, they become permanently stuck together.
808
Mars had an oxygen-rich atmosphere around 4 billion years ago
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Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
46
An international team of astronomers has spotted the farthest known gravitational lens and, as Albert Einstein predicted, it is a galaxy that deflects and intensifies the light of a much further object.
9