The universe contains billions of galaxies.
Fact #2353
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The Earth's gravity keeps the Moon in orbit.
Fact #283 · Space
Mercury has extreme temperature differences.
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The Earth's magnetic field shields the planet from solar wind.
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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 observable universe is about 93 billion light‑years wide.
Fact #1754 · Space
Quasars are extremely bright objects powered by supermassive black holes.
Fact #1601 · Space
The Moon has lower gravity than Earth.
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Asteroids vary widely in size and composition.
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