Pluto is smaller than the United States — it's about 1,400 miles wide.
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Asteroids vary widely in size and composition.
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Dark energy is thought to drive the accelerating expansion of the universe.
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Black holes can slow time so much that seconds near them equal years far away.
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The Earth's orbit around the Sun is slightly elliptical.
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Light from distant galaxies shows us the past.
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The telescope expanded understanding of the universe.
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The universe has no center.
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Venus is sometimes called Earth's sister planet.
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