The sun is so large that 1.3 million Earths could fit inside it.
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The Bell Labs experiment led to the discovery of the cosmic microwave background.
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The largest volcano is on Mars.
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Venus rotates in the opposite direction of most planets in our solar system.
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The Milky Way is just one of billions of galaxies in the universe.
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The Earth's axis is tilted about 23.5 degrees.
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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 and Andromeda galaxies are on a slow collision course.
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The Kepler mission searched for Earth-like exoplanets.
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