A day on Mercury lasts longer than a year on Mercury — one rotation takes 59 Earth days.
Fact #5962
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Some pulsars emit beams of radiation like cosmic lighthouses.
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Black holes can slow time so much that seconds near them equal years far away.
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The observable universe is about 93 billion light‑years wide.
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The Earth is not perfectly round.
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The Earth's gravity keeps the atmosphere in place.
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Exoplanets have been discovered in habitable zones around distant stars.
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The surface of Venus is hidden beneath thick clouds.
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The Earth's rotation slightly bulges at the equator.
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