There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
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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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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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In the last 7 years, humanity has discovered 43 potentially habitable planets.
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