There are more galaxies in the observable universe than grains of sand on all of Earth's beaches.
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The Moon slowly moves away from Earth by a few centimeters each year.
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Solar flares originate from the Sun's surface.
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There are black holes at galaxy centers.
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The observable universe is about 93 billion light‑years wide.
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The Moon completes an orbit around Earth in about 27 days.
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The Hubble Space Telescope revolutionized deep-space imaging.
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