If the Sun were the size of a white blood cell, the Milky Way would be the size of the continental United States.
Fact #4081
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The center of the Milky Way contains a supermassive black hole.
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Neptune is the farthest known major planet from the Sun.
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Black holes can slow time so much that seconds near them equal years far away.
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Saturn could float in water because its density is low.
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The Milky Way is just one of billions of galaxies in the universe.
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Neutron stars can spin hundreds of times per second.
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The observable universe is about 93 billion light‑years wide.
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The International Space Station orbits Earth roughly every 90 minutes.
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