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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From the nitrogen in our DNA, to the calcium in our teeth, the iron in our blood, to the carbon in our apple pies - all were made in the interiors of collapsing stars; we're all made of stardust.
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If you were to cry in space, the tears would form a bubble in your eye until it's so big it moves to another spot on your face.
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In the last 7 years, humanity has discovered 43 potentially habitable planets.
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There is a mass reservoir of water floating in space that is 100,000 times bigger than our sun and holds 140 trillion times more water than all of our oceans.
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