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Space Facts
977 facts in Space. Click any fact to see its full page.
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Plasma is the most abundant state of matter in the universe — stars and lightning are both plasma.
When two black holes merge, they release gravitational waves that ripple through spacetime itself.
Io, one of Jupiter's moons, is the most volcanically active body in the solar system.
Titan is the only moon in the solar system with a dense atmosphere.
A solar flare can release the equivalent energy of billions of nuclear bombs in minutes.
Stars don't twinkle — they appear to because of atmospheric turbulence bending their light.
The first exoplanet orbiting a sun-like star was confirmed in 1995; we've since discovered over 5,000 confirmed exoplanets.
One million Earths could fit inside the Sun.
The Sun accounts for 99.86% of all mass in the solar system.
Astronaut Scott Kelly grew 2 inches taller during his year aboard the ISS and his DNA expression changed compared to his twin.
The coldest place in the known universe is the Boomerang Nebula at −272°C, colder than the cosmic background temperature.
Space is completely silent because sound requires a medium to travel through, and space is a near-perfect vacuum.
The Hubble Space Telescope has traveled more than 4 billion miles in its orbit around Earth since 1990.
A magnetic field surrounds Earth called the magnetosphere, protecting us from solar wind and cosmic radiation.
Jupiter acts as a cosmic vacuum cleaner, its gravity deflecting or capturing comets and asteroids that might otherwise hit Earth.
The light we see from the Andromeda Galaxy left it 2.537 million years ago.
Water has been found on the Moon, locked as ice in permanently shadowed craters near the poles.
Gamma-ray bursts are the most energetic explosions in the universe, briefly outshining entire galaxies.
If the Sun were the size of a white blood cell, the Milky Way would be the size of the continental United States.
The moon is gradually slowing Earth's rotation; days were only 18 hours long 1.4 billion years ago.
Rogue planets — planets ejected from their star systems — may outnumber stars in the galaxy.
The Milky Way galaxy contains between 100 and 400 billion stars and is about 100,000 light-years across.
Comets develop two tails: one made of dust and one of ions, and they always point away from the Sun.
The rings of Saturn are remarkably thin — up to 300,000 km wide but only about 10 meters thick in some places.
Mars has the largest canyon in the solar system, Valles Marineris, stretching 2,500 miles — roughly the width of the US.
Astronauts can grow up to 2 inches taller in space due to spinal decompression in microgravity.
The observable universe is about 93 billion light-years in diameter, but the universe itself is likely much larger.
A stellar black hole is formed when a star at least 20 times more massive than the Sun collapses.
Diamond rain is theorized to fall on Neptune and Uranus due to their extreme pressure and carbon-rich atmospheres.
Pluto's largest moon Charon is so big relative to Pluto that they orbit a common point in space between them.
Europa, Jupiter's moon, likely has more liquid water beneath its icy crust than all of Earth's oceans combined.
The International Space Station travels at 17,500 mph and completes 16 orbits of Earth per day.
On Mars, the sunset is blue due to how fine dust particles scatter light.
The cosmic microwave background radiation permeating the universe is the afterglow of the Big Bang, 13.8 billion years old.
The largest known star, UY Scuti, is so big that if placed in the solar system, it would extend past Jupiter's orbit.
The footprints left on the Moon by Apollo astronauts will remain for at least 10 million years due to no wind or erosion.
Jupiter's Great Red Spot is a storm that has been raging for at least 350 years.
A pulsar (rotating neutron star) can spin over 700 times per second.
The Andromeda Galaxy is on a collision course with the Milky Way and will merge in about 4.5 billion years.
Saturn's moon Titan has lakes and rivers of liquid methane and ethane instead of water.
The Voyager 1 spacecraft, launched in 1977, is the farthest human-made object from Earth, over 23 billion kilometers away.
Light from the Sun takes about 8 minutes to reach Earth, but took 100,000 years to travel from the Sun's core to its surface.
The Olympus Mons volcano on Mars is three times taller than Mount Everest and so wide it couldn't be seen from its own base.
Neutron stars are so dense that a teaspoon of their material would weigh about a billion tons.
A day on Venus is longer than a year on Venus — it rotates so slowly it completes an orbit before one full spin.
There are more stars in the observable universe than grains of sand on all of Earth's beaches.
Astronauts grow up to 2 inches taller in space because the spine decompresses without gravity.
The Moon has no atmosphere, so the sky appears completely black from its surface even in daytime.
Pluto was discovered by a 23-year-old farmer's son named Clyde Tombaugh, who applied to the Lowell Observatory on a whim.
A day on Pluto lasts about 6 Earth days and 9 hours.