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Space Facts
977 facts in Space. Click any fact to see its full page.
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The deepest solo dive ever made without submersible is 332 meters by Ahmed Gabr in 2014.
NASA's Voyager 2 is the only spacecraft to have flown past all four outer planets — Jupiter, Saturn, Uranus, and Neptune.
The New Horizons spacecraft, launched in 2006, flew past Pluto in 2015 and is now beyond the solar system.
The deepest point ever reached by humans was in the Mariana Trench — first visited by Don Walsh and Jacques Piccard in 1960.
The International Space Station is the most expensive structure ever built, costing over $150 billion.
NASA's Perseverance rover successfully produced oxygen on Mars using the MOXIE experiment in 2021.
Redshift occurs when light sources move away — the universe's galaxies are all redshifted, showing universal expansion.
The universe's matter is roughly 5% ordinary matter, 27% dark matter, and 68% dark energy.
Mercury has water ice in permanently shadowed craters despite being the closest planet to the Sun.
The Great Attractor is a gravitational anomaly pulling the Milky Way and thousands of other galaxies toward it.
Io's volcanoes erupt sulfur compounds, giving the moon a mottled yellow, orange, and red surface.
The solar wind constantly streams charged particles from the Sun, shaping planetary magnetospheres.
Radio waves from the Andromeda Galaxy took 2.5 million years to reach Earth's radio telescopes.
The asteroid belt between Mars and Jupiter contains millions of objects but is mostly empty space.
Stellar nurseries like the Orion Nebula contain the gas and dust from which new stars form.
Pluto was reclassified as a dwarf planet in 2006 by the International Astronomical Union.
The largest volcano in the solar system, Olympus Mons on Mars, is 600 km wide at its base.
Mars's two moons, Phobos and Deimos, are thought to be captured asteroids.
There are estimated to be over 100 billion planets in the Milky Way alone.
The Hubble constant — the rate of universe's expansion — has been measured by different methods and doesn't quite agree, puzzling cosmologists.
Pulsars are so regular in their rotation that early researchers thought they might be alien signals — they were initially called LGM-1.
The Moon's far side was not seen by humans until Soviet probe Luna 3 photographed it in 1959.
The cosmic web is a vast structure of filaments of dark matter connecting galaxy clusters across the universe.
Betelgeuse, the red supergiant in Orion, is expected to go supernova sometime in the next 100,000 years.
The Milky Way's supermassive black hole, Sagittarius A*, has a mass 4 million times that of the Sun.
Space has no definitive boundary — the Kármán line at 100 km altitude is a conventional definition.
Stars in globular clusters are so densely packed that planetary systems are unlikely to form stably within them.
The Voyager probes carry golden records with sounds and images of Earth as a message to potential extraterrestrial finders.
Cosmic inflation theory suggests the universe expanded faster than light in the first fraction of a second after the Big Bang.
The longest eclipse of the Sun visible from Earth's surface lasts about 7 minutes and 32 seconds.
The dwarf planet Ceres, in the asteroid belt, has been found to contain water ice and organic compounds.
A magnetar — a type of neutron star — has a magnetic field quadrillions of times stronger than Earth's.
The first images of a black hole were captured in 2019 by the Event Horizon Telescope collaboration.
The Apollo astronauts left retroreflectors on the Moon — scientists still bounce lasers off them today.
Quasars, powered by supermassive black holes, can outshine entire galaxies by a factor of thousands.
Neutron stars pack 1.4 times the mass of the Sun into a sphere about 20 km across.
The Sun's outer atmosphere, the corona, is hundreds of times hotter than its visible surface for reasons not fully understood.
Sound waves in the Coma Galaxy Cluster produce a note 57 octaves below middle C, too low for humans to hear.
The Oort Cloud, a vast reservoir of comets at the edge of the solar system, has never been directly observed.
White dwarf stars are remnants of sun-like stars that have exhausted their nuclear fuel and shed their outer layers.
The Kepler Space Telescope discovered over 2,600 confirmed exoplanets during its mission.
There are rogue black holes — stellar-mass black holes ejected from galaxies and wandering through space.
Europa's subsurface ocean is estimated to contain twice as much water as all of Earth's oceans combined.
Cosmic rays — high-energy particles from space — pass through your body at a rate of about one per second.
The Moon's gravity is responsible for tidal locking — the same side always faces Earth.
The universe is not only expanding but accelerating in its expansion, driven by a force called dark energy.
Saturn is so light relative to its volume that it would float in water if a large enough ocean existed.
There are more galaxies in the observable universe than grains of sand on all of Earth's beaches.
The surface temperature on Venus reaches 465°C — hot enough to melt lead.
A supernova explosion can briefly outshine an entire galaxy of hundreds of billions of stars.