The Moon always shows the same face to Earth.
Fact #134
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The light you see from some stars today began traveling before humans existed.
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The Space Race led to the Apollo 11 Moon landing in 1969.
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Gravitational waves were detected a century after Einstein predicted them.
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Some metals such as mercury are liquid at room temperature.
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Black holes can slow time so much that seconds near them equal years far away.
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The Milky Way is just one of billions of galaxies in the universe.
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The telescope expanded understanding of the universe.
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The Earth orbits the Sun at about 30 kilometers per second.
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