The universe's matter is roughly 5% ordinary matter, 27% dark matter, and 68% dark energy.
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The Sun accounts for more than 99% of the mass of our solar system.
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The International Space Station orbits Earth every 90 minutes.
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Some pulsars emit beams of radiation like cosmic lighthouses.
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The International Space Station is one of the most complex engineering projects ever built.
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The observable universe is about 93 billion light‑years wide.
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The Earth's magnetic field helps prevent atmospheric loss.
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The Mars Pathfinder mission tested new landing techniques.
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Black holes can slow time so much that seconds near them equal years far away.
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