More than 20 million meteoroids enter Earth's atmosphere every day.
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The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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If you went out into space, you would explode before you suffocated because there's no air pressure.
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Some asteroids have other asteroids orbiting them.
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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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The earth is .02 degrees hotter during a full moon.
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An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
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