Saturn's rings are made primarily of ice particles and rocky debris.
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The Milky Way and Andromeda galaxies are on a slow collision course.
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Black holes can slow time so much that seconds near them equal years far away.
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The Hubble Space Telescope has captured deep images of distant galaxies.
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The observable universe is about 93 billion light‑years wide.
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Space is completely silent.
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Mercury has no substantial atmosphere to trap heat.
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A teaspoon of neutron star material would weigh billions of tons.
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Supernovae can briefly outshine entire galaxies.
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