It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
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Not only are there rogue planets floating through space completely alone, not orbiting any stars, but it’s possible that these pitch-black lonely planets support life.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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A comet's tail always points away from the sun.
2
Pluto is smaller than Russia.
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