The largest known structure in the universe is so big that light takes about 10 billion years to cross it.
Fact #2432
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The Pioneer 10 spacecraft was the first to travel through the asteroid belt.
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The Rosetta mission successfully landed a probe on a comet in 2014.
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The Earth orbits the Sun at about 30 kilometers per second.
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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 International Space Station orbits Earth roughly every 90 minutes.
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The observable universe is about 93 billion light‑years wide.
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Supernovae can briefly outshine entire galaxies.
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The Earth's atmosphere gradually fades into space.
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