The surface of Venus is hidden beneath thick clouds.
Fact #1628
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Saturn's rings are made primarily of ice particles and rocky debris.
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The universe has no center.
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The Hubble Space Telescope revolutionized deep-space imaging.
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The Earth's oceans cover more than 70% of the planet's surface.
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Time moves slower in stronger gravitational fields.
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Black holes can slow time so much that seconds near them equal years far away.
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There are rogue planets drifting through space with no star at all.
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The expansion of the universe was first observed in the 1920s.
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