The Voyager Golden Record was sent into space containing sounds and images from Earth.
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The Milky Way is on a slow collision course with Andromeda.
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The Moon was formed billions of years ago.
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The telescope expanded understanding of the universe.
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The Moon's surface is covered with regolith, a layer of loose rock and dust.
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The International Space Station orbits Earth roughly every 90 minutes.
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The Earth's orbit determines the length of the year.
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The Earth's atmosphere is layered into troposphere, stratosphere, and beyond.
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Neptune appears blue because of methane in its atmosphere.
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