Jupiter's moon Ganymede, is larger than the planet Mercury!
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In space, astronauts cannot cry properly, because there is no gravity, so the tears can't flow down their faces!
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The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
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The Earth gets heavier each day by tons, as meteoric dust settles on it.
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The moon is actually moving away from Earth at a rate of 1.5 inches per year.
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If two pieces of metal touch in space, they become permanently stuck together.
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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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