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Space Facts
977 facts in Space. Click any fact to see its full page.
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💬 Language 245
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✨ General 68
✨ Dinosaur 10
The first animal sent into orbit was a dog named Laika, launched by the Soviet Union in 1957.
Io, one of Jupiter's moons, is the most volcanically active body in the solar system with over 400 active volcanoes.
The rings of Saturn are mostly made of chunks of ice and rock, some as small as grains of sand and others as large as houses.
There is a planet made almost entirely of diamond called 55 Cancri e, located about 40 light-years from Earth.
Mars has the largest dust storms in the solar system — they can last for months and cover the entire planet.
Potatoes were the first food to be grown in space, aboard the Space Shuttle Columbia in 1995.
Venus is the hottest planet in our solar system despite Mercury being closer to the Sun, due to its thick atmosphere of carbon dioxide.
If the Sun were the size of a typical front door, Earth would be about the size of a nickel.
The Earth's core is roughly the same temperature as the surface of the Sun — about 10,800 degrees Fahrenheit.
A photon of light can travel from the Sun's core to its surface, but that journey takes about 100,000 years due to constant absorption and re-emission.
The Hubble Space Telescope can see objects that are 13.4 billion light-years away.
On Venus, it rains sulfuric acid that evaporates before reaching the surface.
The largest known structure in the universe is the Hercules-Corona Borealis Great Wall, a supercluster of galaxies spanning 10 billion light-years.
Enceladus, a moon of Saturn, has geysers that shoot water vapor and ice into space.
The observable universe has a diameter of about 93 billion light-years.
There are rogue planets floating through space that are not bound to any star.
The coldest known place in the universe is the Boomerang Nebula, with temperatures reaching minus 458 degrees Fahrenheit.
A year on Mercury is just 88 Earth days long.
The Milky Way galaxy is on a collision course with the Andromeda galaxy and they will merge in about 4.5 billion years.
The Sun's core temperature is approximately 27 million degrees Fahrenheit.
Neutron stars can spin up to 716 times per second.
The International Space Station travels at about 17,500 miles per hour, orbiting Earth roughly every 90 minutes.
Astronauts grow up to 2 inches taller in space because the lack of gravity allows the spine to decompress.
There is a cloud of alcohol in space that spans 288 billion miles and contains enough ethanol to fill 400 trillion trillion pints of beer.
Jupiter's Great Red Spot is a storm that has been raging for at least 350 years and is larger than Earth.
The Sun accounts for 99.86% of all the mass in our solar system.
Olympus Mons on Mars is the tallest known volcano in the solar system, standing nearly three times the height of Mount Everest.
The Voyager 1 spacecraft, launched in 1977, is the most distant human-made object from Earth at over 15 billion miles away.
Space is completely silent because there is no medium for sound waves to travel through.
The largest known star, UY Scuti, has a radius roughly 1,700 times that of our Sun.
Saturn's density is so low that it would float if placed in a body of water large enough to hold it.
The footprints left by Apollo astronauts on the Moon will remain there for at least 100 million years because there is no wind or water to erode them.
A day on Venus is longer than a year on Venus — it takes 243 Earth days to rotate once but only 225 Earth days to orbit the Sun.
Voyager 2 is the only spacecraft to have visited Uranus and Neptune — flying past in 1986 and 1989.
The 2004 Indian Ocean tsunami was detected by GPS satellites — revealing ground displacement across thousands of km.
The Apollo missions brought back 382 kg of lunar rock — still being studied today.
The James Webb Space Telescope has observed galaxies that formed just 300 million years after the Big Bang.
The Opportunity rover found evidence that ancient Mars had liquid water — in sulfate-rich rocks.
Magellan mapped 98% of Venus's surface with radar — revealing a world covered in lava plains and volcanic features.
The Chandra X-Ray Observatory has observed the hottest, most energetic events in the universe for over 20 years.
The solar wind discovered by Eugene Parker in 1958 was confirmed by the Mariner 2 mission in 1962.
The WISE telescope discovered 33,000 previously unknown asteroids and 19 comets.
Mars Reconnaissance Orbiter has returned more data than all other interplanetary missions combined.
The Spitzer Space Telescope observed the universe in infrared — revealing star-forming regions hidden by dust.
The Hubble Ultra Deep Field image (2004) shows 10,000 galaxies — in a patch of sky smaller than a grain of sand held at arm's length.
TESS (Transiting Exoplanet Survey Satellite) has identified 6,400+ exoplanet candidates since its 2018 launch.
The Kepler space telescope found over 2,600 confirmed exoplanets during its 9-year mission.
The Mars Phoenix lander confirmed water ice in the Martian soil in 2008.
New Horizons revealed Pluto's complex geology — mountains, glaciers, and atmospheric hazes.
The Parker Solar Probe has 'touched' the Sun — entering the solar corona, closer than any previous spacecraft.