NASA's Voyager probes are powered by plutonium-238 batteries that will continue operating until around 2025.
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Interstellar objects have passed through our solar system.
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The observable universe is about 93 billion light‑years wide.
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The observable universe is about 93 billion light‑years wide.
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There are rogue planets drifting through space with no star at all.
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The Milky Way is on a slow collision course with Andromeda.
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Black holes can slow time so much that seconds near them equal years far away.
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The Hubble Space Telescope has captured deep images of distant galaxies.
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Asteroids vary widely in size and composition.
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