The oldest known star is Methuselah (HD 140283) — estimated to be 13.8 billion years old, nearly as old as the universe.
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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 merge and release enormous energy.
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Black holes can slow time so much that seconds near them equal years far away.
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The International Space Station orbits Earth every 90 minutes.
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The observable universe is about 93 billion light‑years wide.
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Neptune is the farthest known major planet from the Sun.
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Magnetars have extremely powerful magnetic fields.
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The Moon is slowly moving away from Earth.
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