The ISS is visible to more people than any structure ever built.
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Jupiter has a magnetic field stronger than Earth's.
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Supernovae can briefly outshine entire galaxies.
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Neutron stars are so dense that a single teaspoon would weigh billions of tons on Earth.
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Interstellar objects have passed through our solar system.
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Saturn could float in water because its density is low.
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Black holes can slow time so much that seconds near them equal years far away.
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The Sun makes up 99.8% of solar mass.
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The observable universe is about 93 billion light‑years wide.
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