Io, one of Jupiter's moons, is the most volcanically active body in the solar system with over 400 active volcanoes.
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The Earth's gravity keeps the Moon in orbit.
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The Milky Way is on a slow collision course with Andromeda.
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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 slow time so much that seconds near them equal years far away.
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The Earth's magnetic field helps prevent atmospheric loss.
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Supernovae can briefly outshine entire galaxies.
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The Moon slowly moves away from Earth by a few centimeters each year.
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The observable universe is about 93 billion light‑years wide.
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