Earth is the only planet in our solar system that's not named after a god or goddess.
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When a massive power outage struck southern California in the 1990s, Los Angeles residents reportedly called 911 to express alarm about strange clouds hovering overhead; they were seeing the Milky Way for the first time.
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Pluto is smaller than Russia.
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If NASA sent birds into space they would soon die; they need gravity to swallow.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
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