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Space Facts
977 facts in Space. Click any fact to see its full page.
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The footprints astronauts left on the Moon will likely last for millions of years.
Space starts at the Kármán line, just 100 km above sea level.
There are more stars in the universe than grains of sand on every beach on Earth.
Saturn's moon Titan has rivers and lakes — but they're filled with liquid methane, not water.
A day on Venus is longer than its year.
The International Space Station is the most expensive object ever constructed and can be seen with the naked eye from Earth.
The Mars rovers Spirit and Opportunity were designed for 90-day missions but operated for 6 and 14 years respectively.
The Voyager 1 spacecraft has traveled farther from Earth than any other human-made object.
The most expensive item ever built is the International Space Station, costing over $150 billion.
The eye of a hurricane is eerily calm, with clear skies and light winds, surrounded by the most violent part of the storm.
The Juno spacecraft reached speeds of over 165,000 miles per hour as it approached Jupiter.
The TRAPPIST-1 system contains seven Earth-sized planets, three of which are in the habitable zone.
The Curiosity rover plays Happy Birthday to itself every year on the anniversary of its Mars landing using its soil sampling mechanism.
The first American space station, Skylab, fell back to Earth in 1979 and pieces landed in Western Australia.
The Cassini-Huygens mission traveled 2.2 billion miles to reach Saturn and spent 13 years studying the planet and its moons.
Alan Shepard hit a golf ball on the Moon during the Apollo 14 mission in 1971.
The International Space Station has been continuously occupied since November 2, 2000.
The Kepler Space Telescope discovered over 2,600 exoplanets during its nine-year mission.
The Opportunity rover on Mars was designed for a 90-day mission but operated for over 14 years.
The Soviet space station Mir was continuously occupied for nearly 10 years, from 1989 to 1999.
The New Horizons probe, which flew past Pluto in 2015, carries a small amount of Clyde Tombaugh's ashes — the astronomer who discovered Pluto.
The Hubble Space Telescope orbits Earth at about 340 miles above the surface and completes one orbit every 95 minutes.
The Soviet Union's Venera 7 was the first spacecraft to successfully land on another planet and transmit data back to Earth in 1970.
NASA's Voyager probes are powered by plutonium-238 batteries that will continue operating until around 2025.
The first living creatures to orbit the Moon and return safely were two Russian tortoises aboard Zond 5 in 1968.
Astronauts cannot burp in space because without gravity, gas does not separate from liquid in the stomach.
Venus is the only planet in our solar system that spins clockwise.
Some fungi can survive in space, and researchers are studying whether they could help colonize other planets.
The Indian space program sent a mission to Mars, Mangalyaan, on its first attempt and for less money than it cost to make the movie Gravity.
The Mars Curiosity rover sings 'Happy Birthday' to itself every year on the anniversary of its landing.
Russia has a larger surface area than Pluto.
Black holes can technically evaporate over trillions of years through a process called Hawking radiation.
A thimbleful of a neutron star would weigh over 6 billion tons.
The Earth's rotation is gradually slowing down — days were only about 22 hours long 600 million years ago.
The lightest known exoplanet, PSR B1257+12 A, has a mass only twice that of the Moon.
Titan is the only moon in the solar system with a dense atmosphere, which is mostly nitrogen like Earth's.
The total number of stars visible to the naked eye from Earth is only about 9,000, split between the two hemispheres.
Rogue black holes wander through galaxies at millions of miles per hour after being ejected from their original positions.
The Perseverance rover on Mars carries a small helicopter called Ingenuity, which made the first powered flight on another planet.
Gravitational lensing allows astronomers to see galaxies behind other galaxies by bending light around massive objects.
The fastest spinning pulsar ever discovered rotates 716 times per second.
The temperature difference between the sunny and shady sides of the Moon can exceed 500 degrees Fahrenheit.
Ceres, the largest object in the asteroid belt, contains about one-third of the belt's total mass.
The diameter of the observable universe is about 93 billion light-years, even though it is only 13.8 billion years old.
The cosmic microwave background radiation has a temperature of about 2.7 Kelvin, or minus 454.8 degrees Fahrenheit.
Hypervelocity stars are traveling so fast through space that they will eventually escape the gravitational pull of the Milky Way entirely.
The event horizon of a black hole is the boundary beyond which nothing, not even light, can escape.
Binary star systems, where two stars orbit each other, are more common in the universe than single stars like our Sun.
Olympus Mons on Mars is not only the tallest volcano in the solar system but also has a base the size of Arizona.
The Hubble Space Telescope has made over 1.5 million observations since its launch in 1990.