The Hubble Space Telescope's Deep Field image revealed thousands of galaxies in a patch of sky the size of a grain of sand.
Fact #5680
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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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Black holes can bend light through gravitational lensing.
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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 Milky Way contains regions of active star formation.
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The Moon's surface temperature varies dramatically.
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The Bell Labs experiment led to the discovery of the cosmic microwave background.
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