The Earth's atmosphere gradually thins into outer space.
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Light from distant galaxies shows us the past.
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The Earth's gravity keeps the atmosphere in place.
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The Moon's surface is covered with regolith, a layer of loose rock and dust.
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Jupiter is the largest planet in the solar system.
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The observable universe is about 93 billion light‑years wide.
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The Earth's magnetic field protects against solar radiation.
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There are black holes at galaxy centers.
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Exoplanets have been discovered in habitable zones around distant stars.
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