Some galaxies contain trillions of stars.
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The Kepler mission searched for Earth-like exoplanets.
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The Milky Way galaxy is part of the Local Group.
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The Milky Way contains regions of active star formation.
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The Hubble Space Telescope revolutionized deep-space imaging.
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Venus has the longest day of any planet in the solar system.
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The expansion of the universe was first observed in the 1920s.
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Space is completely silent.
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The Moon's surface is covered with regolith, a layer of loose rock and dust.
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