The universe is mostly nothing — matter makes up only 5% of the universe's total energy content.
Fact #6396
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Dark matter is believed to make up most of the universe’s mass but has not been directly observed.
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Space smells like burned metal.
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Neptune appears blue because of methane in its atmosphere.
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The light you see from some stars today began traveling before humans existed.
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The Milky Way galaxy contains billions of stars.
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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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Time moves slower in stronger gravitational fields.
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