The Moon was likely formed after a massive collision with early Earth.
Fact #209
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The Bell Labs experiment led to the discovery of the cosmic microwave background.
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Supernovae can briefly outshine entire galaxies.
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The observable universe is about 93 billion light‑years wide.
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Black holes can slow time so much that seconds near them equal years far away.
Fact #1776 · Space
The Milky Way is just one of billions of galaxies in the universe.
Fact #78 · Space
The Earth's gravity affects the movement of tides.
Fact #231 · Space
Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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The Moon's surface temperature varies dramatically.
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