Venus is sometimes called Earth's sister planet.
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The Hubble Space Telescope revolutionized deep-space imaging.
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The International Space Station orbits Earth every 90 minutes.
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The Mars Pathfinder mission tested new landing techniques.
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Asteroids vary widely in size and composition.
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The Voyager Golden Record was sent into space containing sounds and images from Earth.
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Solar eclipses occur when the Moon blocks the Sun from Earth's view.
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There are rogue planets drifting through space with no star at all.
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Black holes can slow time so much that seconds near them equal years far away.
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