27% of the universe · All Facts

27% of the universe
Dark matter makes up about 27% of the universe, but scientists still don't know what it actually is.
SrcCERN

Next evidence →Space is completely silentSpace is completely silent — sound waves require a medium (like air) to travel through, and space is a vacuum. Astronauts on spacewalks can only communicate through radio waves. Even the most massive explosions in space produce no sound.

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More in Space

diamond “rain”Lab experiments show hydrocarbons can form diamond “rain” under extreme pressure — supporting models for Neptune and Uranus interiors.
72,000 feetOlympus Mons on Mars rises about 72,000 feet (21.9 km) — roughly 2.5× Mount Everest — the solar system's tallest volcano.
lakes of liquid methaneSaturn's moon Titan has stable lakes of liquid methane — the only world besides Earth known to have standing surface liquids.
1.5 inches (3.8 cm) per yearLunar laser ranging shows the Moon drifting away by about 1.5 inches (3.8 cm) per year.

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