There are stars that no longer exist, but their light is still traveling toward us.
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The Earth orbits the Sun at about 30 kilometers per second.
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Black holes can slow time so much that seconds near them equal years far away.
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Asteroids vary widely in size and composition.
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Exoplanets have been discovered in habitable zones around distant stars.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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The Earth's gravity affects the movement of tides.
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Venus has surface temperatures hot enough to melt lead.
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