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Space Facts
977 facts in Space. Click any fact to see its full page.
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Jupiter acts as a gravitational shield for the inner solar system — deflecting incoming comets and asteroids.
The outer planets Jupiter, Saturn, Uranus, and Neptune are mostly gas and ice — they have no solid surface.
Venus is the hottest planet — not Mercury — because its thick CO₂ atmosphere traps heat.
Titan is the only moon in the solar system with a dense atmosphere and surface liquids.
The Voyager probes carry golden records with music, images, and greetings — in case they're found by other civilizations.
The solar wind blows at 400–800 km/s — Earth's magnetic field deflects it around the planet.
Jupiter's magnetic field is the strongest of any planet — 14 times more powerful than Earth's.
Mars's two moons — Phobos and Deimos — are likely captured asteroids.
The sun contains 99.86% of the total mass of the solar system.
Earth is the densest planet in the solar system — composed of heavy iron and silicate rock.
The Kuiper Belt beyond Neptune contains hundreds of thousands of icy objects — Pluto is the largest known.
Comets are 'dirty snowballs' — mixtures of ice, dust, and organic compounds.
The asteroid belt between Mars and Jupiter contains millions of objects — but the total mass is less than the Moon.
Neptune has winds reaching 2,100 km/h — the fastest in the solar system.
The moons of Jupiter include Ganymede — the largest moon in the solar system, bigger than Mercury.
Saturn's moon Enceladus has geysers of water shooting hundreds of kilometers into space from its south pole.
IO's volcanoes erupt with sulfur — producing yellow, orange, and red patterns across the surface.
Pluto's Charon is so large relative to Pluto that they orbit a common point between them.
The dwarf planet Ceres has bright spots in its Occator crater — likely salt deposits from subsurface water.
Europa's ice shell is cracked and rearranged by tidal forces — suggesting an active liquid ocean beneath.
Titan, Saturn's moon, has lakes and rivers of liquid methane — and a thick nitrogen atmosphere.
Uranus rotates on its side — its axis is tilted 98 degrees — possibly due to an ancient collision.
Neptune was predicted mathematically before it was observed — by Urbain Le Verrier in 1846.
Mercury has ice in permanently shadowed craters at its poles — despite being the closest planet to the Sun.
Mars has the largest volcano in the solar system — Olympus Mons, 21 km tall and 600 km wide.
Jupiter's Great Red Spot is a storm larger than Earth that has persisted for at least 350 years.
Saturn's rings are only about 10–100 meters thick despite spanning 270,000 km in diameter.
Venus spins in the opposite direction to most planets — the sun rises in the west on Venus.
The ocean floor is better mapped on Mars and the Moon than on Earth.
The first photograph of a black hole was released in 2019 — it required linking 8 radio telescopes worldwide.
The surface of the Sun is cooler than its outer atmosphere — the corona heating problem is still unsolved.
The Carrington Event of 1859 was the most powerful geomagnetic storm in recorded history — telegraph wires caught fire.
Jupiter's moon Europa likely has twice as much liquid water as all of Earth's oceans.
The Voyager Golden Record experiment — a message to the cosmos — contains 115 images, music, and greetings in 55 languages.
The smallest known black hole is J1655-40 — about 6.3 times the mass of the Sun and 37 km across.
Wave energy — using ocean wave motion to generate power — remains one of the least exploited renewable sources.
Io, Jupiter's moon, has over 400 active volcanoes — the most volcanically active body in the solar system.
Mount Pinatubo's 1991 eruption cooled global temperatures by 0.5°C for about 2 years.
Volcanic islands like Hawaii form above 'hot spots' — plumes of magma rising from deep in the mantle.
Mount St. Helens' 1980 eruption released energy equivalent to 26,000 Hiroshima atomic bombs.
Hawaii's Kilauea is one of the most continuously active volcanoes on Earth — it has been erupting since 1983.
The strongest hurricane ever recorded in the Atlantic was Hurricane Patricia (2015) with winds of 345 km/h.
The highest wind speed ever recorded was 408 km/h during Tropical Cyclone Olivia in 1996.
The moon has 'moonquakes' — seismic activity caused by tidal forces from Earth and the Sun.
The moon is moving away from Earth at a rate of 3.8 cm per year.
A day on Mercury lasts 59 Earth days, but a year is only 88 Earth days.
A day on Venus is longer than a year on Venus due to its extremely slow retrograde rotation.
Cosmic rays — high-energy particles from space — were the first source of positrons (antielectrons) ever detected.
The cosmic inflation period — 10⁻³⁶ to 10⁻³² seconds after the Big Bang — expanded the universe by a factor of 10⁷⁸.
The Big Bang didn't happen at a point in space — space itself expanded from a state of extreme density.