72,000 feet · All Facts

72,000 feet
Olympus Mons on Mars rises about 72,000 feet (21.9 km) — roughly 2.5× Mount Everest — the solar system's tallest volcano.
SrcNASA/ASU THEMIS — Mars Odyssey

Next evidence →lakes of liquid methaneSaturn's moon Titan has stable lakes of liquid methane — the only world besides Earth known to have standing surface liquids.

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diamond “rain”Lab experiments show hydrocarbons can form diamond “rain” under extreme pressure — supporting models for Neptune and Uranus interiors.
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.
76 yearsHalley's Comet returns on average every 76 years; last seen in 1986, next perihelion is in 2061.

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