The Milky Way's supermassive black hole, Sagittarius A*, has a mass 4 million times that of the Sun.
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Venus rotates in the opposite direction of most planets in our solar system.
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There are more stars in the universe than grains of sand on Earth.
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The International Space Station orbits Earth every 90 minutes.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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A sea star can regrow lost arms.
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The light you see from some stars today began traveling before humans existed.
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Solar eclipses occur when the Moon blocks the Sun from Earth's view.
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The expansion of the universe was first observed in the 1920s.
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