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Space Facts
977 facts in Space. Click any fact to see its full page.
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Mount Olympus on Mars stands about 13 miles high — nearly three times the height of Mount Everest.
Every proton in your body is approximately 13.8 billion years old — created moments after the Big Bang.
Sharks are older than Saturn's rings — the rings formed between 10 and 100 million years ago, long after sharks appeared.
Liquid water exists under the surface of Mars, according to radar data from the Mars Express orbiter.
The Earth's magnetic poles have reversed hundreds of times throughout history — and are currently shifting.
The Hubble Space Telescope can see objects up to 13.4 billion light-years away.
There are at least two trillion galaxies in the observable universe.
The first animal in space was a dog named Laika — she was launched by the Soviet Union in 1957 and did not survive.
White dwarf stars are so dense that a matchbox-sized amount would weigh about 10 tons on Earth.
The Moon has moonquakes — triggered by Earth's gravity and the Sun's heat.
Space smells like burnt steak, hot metal, and welding fumes — astronauts report this on their suits after spacewalks.
The coldest known place in the universe is the Boomerang Nebula at -458°F — colder than deep space.
Mars has two moons — Phobos and Deimos — which are likely captured asteroids.
The Sun is so large that about 1.3 million Earths could fit inside it.
There is enough gold in Earth's core to cover the entire surface of the planet in 1.5 feet of gold.
Every year, the Moon moves about 3.8 centimeters further away from Earth.
If you dug a hole to the center of the Earth, you'd encounter temperatures around 10,800°F — as hot as the Sun's surface.
Helium was discovered on the Sun before it was found on Earth — its name comes from Helios, the Greek sun god.
The Voyager probes carry golden records with sounds and images of Earth — a message to any civilization that might find them.
Titan has lakes and rivers, but they're filled with liquid methane instead of water.
The Olympus Mons volcano on Mars is so wide that if you stood on its edge, the other side would be beyond the horizon.
There are more galaxies in the observable universe than grains of sand on all of Earth's beaches.
Neptune was the first planet to be predicted mathematically before it was observed — astronomers noticed Uranus wasn't following expected orbit.
Titan, Saturn's largest moon, is the only moon in the solar system with a dense atmosphere.
The temperature on the Moon swings from 260°F in sunlight to -280°F in shadow.
A pulsar — a rotating neutron star — can spin up to 700 times per second.
The center of the Milky Way smells like rum and tastes like raspberries — ethyl formate, the compound responsible, has been detected there.
Pluto is smaller than the United States — it's about 1,400 miles wide.
The International Space Station travels at 17,500 mph and orbits Earth every 90 minutes.
The observable universe is about 93 billion light-years in diameter.
Uranus rotates on its side — its axial tilt is 98 degrees, likely from a massive ancient collision.
The Sun loses about 4 million tons of mass every second through nuclear fusion.
A year on Pluto lasts 248 Earth years — it hasn't completed one orbit since its discovery in 1930.
There is a diamond planet twice the size of Earth — 55 Cancri e has a surface of graphite and diamond.
The largest known star, UY Scuti, is so large that if it replaced the Sun, it would extend past Jupiter.
Venus spins in the opposite direction to most planets — the sun rises in the west and sets in the east.
Europa, one of Jupiter's moons, has a subsurface ocean that contains more liquid water than all of Earth's oceans combined.
The cosmic microwave background radiation — the afterglow of the Big Bang — is still detectable today, 13.8 billion years later.
On Mercury, a year lasts only 88 Earth days, but a day lasts 59 Earth days.
The Andromeda galaxy is on a collision course with the Milky Way, expected to merge in about 4.5 billion years.
One million Earths could fit inside the Sun.
The Milky Way galaxy is estimated to contain between 100 and 400 billion stars.
Mars has the largest volcano in the solar system — Olympus Mons is about three times the height of Mount Everest.
Space is completely silent — sound requires a medium to travel through, and space is a near-perfect vacuum.
The Voyager 1 spacecraft, launched in 1977, is the most distant human-made object — over 23 billion kilometers from Earth.
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 Sun accounts for 99.86% of all the mass in the solar system.
Saturn's rings are only about 30 feet thick on average despite being 175,000 miles wide.
The footprints left by Apollo astronauts on the Moon will likely remain for at least 10 million years.
Neutron stars are so dense that a teaspoon of their material would weigh about a billion tons on Earth.