The Earth's atmosphere extends thousands of miles into space.
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Neptune is the farthest known major planet from the Sun.
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The Moon has no liquid water on its surface today.
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The observable universe is about 93 billion light‑years wide.
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The Hubble Space Telescope revolutionized deep-space imaging.
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The Rosetta mission successfully landed a probe on a comet in 2014.
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Cosmic rays constantly bombard Earth from space.
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The Milky Way galaxy contains billions of stars.
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The Milky Way is estimated to contain hundreds of billions of stars.
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