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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Mars had an oxygen-rich atmosphere around 4 billion years ago
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If NASA sent birds into space they would soon die; they need gravity to swallow.
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There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15
In the last 7 years, humanity has discovered 43 potentially habitable planets.
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The density of Saturn is so low that if you were to put it in a giant glass of water it would float.
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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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