More than 20 million meteoroids enter Earth's atmosphere every day.
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The Earth gets heavier each day by tons, as meteoric dust settles on it.
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Some asteroids have other asteroids orbiting them.
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The typical spec of dust that you see floating in the air is half way in size between the Earth and a subatomic particle.
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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.
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Jupiter has radio storms so strong that they can be picked up and heard by an AM radio.
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