Each galaxy contains billions or trillions of stars.
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The Earth orbits the Sun once every year.
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The Space Race led to the Apollo 11 Moon landing in 1969.
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Black holes can slow time so much that seconds near them equal years far away.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Some stars explode when they die.
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The Sun will eventually expand into a red giant.
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The U.S. government ran Project Stargate to study alleged psychic phenomena.
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Black holes have gravitational pulls so strong that not even light can escape.
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