The Hubble Space Telescope's Deep Field image revealed thousands of galaxies in a patch of sky the size of a grain of sand.
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Saturn has dozens of known moons.
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The Great Attractor is a gravitational anomaly influencing the motion of galaxies.
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The Earth's orbit around the Sun is slightly elliptical.
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The Sun will eventually expand into a red giant.
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The Vostok 1 mission marked the first human spaceflight.
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The Milky Way is estimated to contain hundreds of billions of stars.
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The Moon's surface is covered with regolith, a layer of loose rock and dust.
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The Earth's atmosphere is layered into troposphere, stratosphere, and beyond.
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