Mars had an oxygen-rich atmosphere around 4 billion years ago
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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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The Earth gets heavier each day by tons, as meteoric dust settles on it.
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The typical spec of dust that you see floating in the air is half way in size between the Earth and a subatomic particle.
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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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A neutron star (what remains after a Super Nova) is so dense that a portion of it the size of a sugar cube would weigh as much as all of humanity, or more than all the cars in the United States.
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In the last 7 years, humanity has discovered 43 potentially habitable planets.
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