The Great Wall of galaxies is one of the largest known structures — a supercluster filament 1.37 billion light-years long.
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The Milky Way and Andromeda galaxies are on a slow collision course.
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The observable universe is about 93 billion light‑years wide.
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Black holes form from collapsed massive stars.
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Cosmic microwave background radiation is evidence of the early universe.
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Black holes can slow time so much that seconds near them equal years far away.
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Interstellar objects have passed through our solar system.
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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 Moon completes an orbit around Earth in about 27 days.
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