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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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🚀 Space 977
🧠 Psychology 893
🌿 Nature 759
💻 Technology 735
🌍 Geography 599
🎭 Culture 581
🫀 Human Body 572
🌊 Ocean 373
💬 Language 245
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✨ General 68
✨ Dinosaur 10
The bombardier beetle defends itself by spraying a boiling hot chemical mixture from its abdomen.
Sloths can hold their breath for up to 40 minutes underwater, which is longer than many dolphins.
The Arctic tern has the longest migration of any bird, traveling roughly 44,000 miles annually from Arctic to Antarctic and back.
Octopuses have been observed using coconut shells as portable shelters, one of the few examples of tool use in invertebrates.
The Wow! signal, detected in 1977, remains one of the strongest candidates for an extraterrestrial radio signal ever recorded.
Mercury has no atmosphere to retain heat, so temperatures swing from 800 degrees Fahrenheit during the day to minus 290 at night.
There are estimated to be 2 trillion galaxies in the observable universe.
The Moon is moving away from Earth at a rate of about 1.5 inches per year.
The Cassini spacecraft orbited Saturn for 13 years before intentionally diving into the planet's atmosphere in 2017.
Solar flares can disrupt satellite communications, GPS signals, and power grids on Earth.
The Andromeda Galaxy is the nearest large galaxy to the Milky Way and contains roughly one trillion stars.
A white dwarf star is so dense that a teaspoon of its material would weigh about 15 tons on Earth.
There are more than 5,000 confirmed exoplanets discovered outside our solar system.
The asteroid belt between Mars and Jupiter contains millions of asteroids but is mostly empty space.
The Pillars of Creation in the Eagle Nebula are columns of interstellar gas and dust about 5 light-years tall.
Venus rotates so slowly that a single day on Venus is longer than its entire year.
The largest known galaxy, IC 1101, has a diameter of about 6 million light-years.
Astronauts on the ISS witness about 16 sunrises and sunsets every day.
The first photograph of a black hole was captured in 2019 by the Event Horizon Telescope.
A magnetar is a type of neutron star with a magnetic field so powerful it could erase a credit card from halfway across the solar system.
The surface temperature of the Sun is about 10,000 degrees Fahrenheit, but its corona reaches over 2 million degrees.
Europa, a moon of Jupiter, likely has a saltwater ocean beneath its icy surface that may contain more water than all of Earth's oceans.
The Oort Cloud, a theoretical shell of icy objects surrounding the solar system, may extend up to 2 light-years from the Sun.
Pulsars are rapidly spinning neutron stars that emit beams of radiation like cosmic lighthouses.
The Parker Solar Probe is the fastest human-made object, reaching speeds of over 430,000 miles per hour.
Triton, Neptune's largest moon, orbits in the opposite direction of the planet's rotation, suggesting it was captured from the Kuiper Belt.
The Crab Nebula is the remnant of a supernova explosion that was visible from Earth in 1054 AD.
Dark matter makes up about 27% of the universe but has never been directly observed.
There is a massive cloud of water vapor in space that contains 140 trillion times the amount of water in Earth's oceans.
The Sun will eventually become a red giant and engulf Mercury, Venus, and possibly Earth in about 5 billion years.
The Kuiper Belt, a region beyond Neptune, contains billions of icy objects including dwarf planets.
The space between stars is not completely empty — it contains about one atom per cubic centimeter on average.
Titan, Saturn's largest moon, has lakes and rivers made of liquid methane and ethane instead of water.
A suit worn by astronauts during spacewalks costs approximately $12 million.
The cosmic microwave background radiation is the afterglow of the Big Bang and can be detected in every direction in space.
Ganymede, a moon of Jupiter, is the largest moon in the solar system and is even bigger than the planet Mercury.
The closest star to our solar system, Proxima Centauri, is about 4.24 light-years away.
Pluto's largest moon, Charon, is so big relative to Pluto that the two orbit each other like a double planet system.
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.
The Sun loses about 4 million tons of mass every second due to nuclear fusion converting matter into energy.
The word 'lethologica' describes the state of being unable to remember the word you want to use.
In Morse code, the most common letter in English — 'E' — is represented by a single dot.
The exclamation mark was originally called the 'note of admiration.'
The average person knows between 20,000 and 35,000 words in their native language.
Esperanto is the most widely spoken constructed language, with an estimated 2 million speakers worldwide.
The word 'robot' comes from the Czech word 'robota,' meaning forced labor.