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11,491 facts. Click any fact to see its full page.
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📜 History 1,991
🔬 Science 1,964
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🧠 Psychology 893
🌿 Nature 759
💻 Technology 735
🌍 Geography 599
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✨ General 68
✨ Dinosaur 10
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.
There are more atoms in a glass of water than there are glasses of water in all of Earth's oceans.
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.
The sun converts 4 million tons of mass into energy every second through nuclear fusion.
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.
Black holes don't suck — objects fall into them the same way they'd fall toward any massive body.
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.
There are more possible chess games than atoms in the observable universe.
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.
The wood frog freezes solid in winter, its heart stopping completely, then thaws and hops away in spring.
Naked mole rats are resistant to cancer, feel no pain from acid or capsaicin, and can survive 18 minutes without oxygen.
Cephalopods like squid and octopus have camera-like eyes that evolved completely independently from vertebrate eyes.
The migratory Arctic tern travels from pole to pole each year — roughly 44,000 miles round trip.
Dolphins have been observed using sponges as tools to protect their snouts while foraging on the seafloor.
Horseshoe crabs have blue blood containing a clotting agent used to test all injectable medicines for contamination.
The Australian lyrebird has such a powerful voice it can be heard over a kilometer away.
Penguins propose to their mates by offering a pebble; females reject unsuitable males by walking away.
Sea cucumbers breathe through their anus and can eject their internal organs as a defense mechanism.