The International Space Station required 42 assembly flights and over 200 spacewalks to construct.
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Some galaxies contain supermassive black holes millions of times the Sun’s mass.
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The Milky Way galaxy contains billions of stars.
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The Bell Labs experiment led to the discovery of the cosmic microwave background.
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Rogue planets drift through space without orbiting a star.
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Black holes can slow time so much that seconds near them equal years far away.
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The telescope expanded understanding of the universe.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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The Sun occasionally emits powerful solar flares.
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