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Space Facts
977 facts in Space. Click any fact to see its full page.
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The coldest natural place in the universe is the Boomerang Nebula at −272°C — colder than the cosmic background.
Pulsars are so regular that early astronomers thought they might be alien signals — one was called LGM-1 (Little Green Men).
Light from the edge of the observable universe has been traveling toward us since shortly after the Big Bang.
The Crab Nebula is the remnant of a supernova observed and recorded by Chinese astronomers in 1054 AD.
Galaxy mergers are common — the Milky Way has already absorbed dozens of smaller galaxies.
A stellar-mass black hole 10 times the Sun's mass would be only about 60 km across.
The most distant object ever observed is a galaxy approximately 13.4 billion light-years away.
There are an estimated 2 trillion galaxies in the observable universe.
The observable universe is approximately 93 billion light-years in diameter.
A day on Venus is longer than a year on Venus.
The footprints left on the Moon will remain intact for at least 10 million years.
A day on the Moon lasts about 29.5 Earth days — the same as one lunar month.
More people have been to the Moon than have ever been to the Mariana Trench.
The magnetic north pole moves — it has shifted over 2,000 km since it was first measured in 1831.
The longest echo in a man-made space lasts 112 seconds — recorded in an empty oil storage tank in Scotland.
The Moon has 'moonquakes' caused by tidal forces from Earth — some have registered up to 5.5 on the Richter scale.
The sun is so large that 1.3 million Earths could fit inside it.
The Voyager 1 probe is traveling at about 61,000 km/h — even at that speed it would take 75,000 years to reach the nearest star.
The Voyager probes carry golden records with sounds and images from Earth as a message to possible finders.
The first descent to the bottom of the Mariana Trench took nearly 5 hours in the bathyscaphe Trieste.
New Horizons flew past Pluto in 2015 and is now beyond the solar system.
The Rosetta spacecraft became the first to orbit and land a probe on a comet in 2014.
The COBE satellite in 1992 detected temperature variations in the cosmic background radiation, confirming Big Bang models.
NASA's Voyager 2 is the only spacecraft to fly past all four outer planets.
The asteroid belt was discovered piece by piece — Ceres was found first, in 1801.
The first satellite image of Earth was taken in 1959, revealing cloud patterns from space for the first time.
The SETI project has been scanning the skies for alien signals since 1960.
The Hubble Deep Field image revealed thousands of galaxies in a patch of sky the size of a grain of sand.
The deepest manned dive ever reached the Mariana Trench floor — first visited by Piccard and Walsh in 1960.
The Voyager probes carry golden records with sounds and images from Earth as a message to possible finders.
The first descent to the bottom of the Mariana Trench took nearly 5 hours in the bathyscaphe Trieste.
New Horizons flew past Pluto in 2015 and is now beyond the solar system.
The Rosetta spacecraft became the first to orbit and land a probe on a comet in 2014.
The COBE satellite in 1992 detected temperature variations in the cosmic background radiation, confirming Big Bang models.
NASA's Voyager 2 is the only spacecraft to fly past all four outer planets.
The asteroid belt was discovered piece by piece — Ceres was found first, in 1801.
The first satellite image of Earth was taken in 1959, revealing cloud patterns from space for the first time.
The SETI project has been scanning the skies for alien signals since 1960.
The Hubble Deep Field image revealed thousands of galaxies in a patch of sky the size of a grain of sand.
The deepest manned dive ever reached the Mariana Trench floor — first visited by Piccard and Walsh in 1960.
A day on Mercury lasts longer than a year on Mercury — one rotation takes 59 Earth days.
The International Space Station is the most expensive structure ever built, costing over $150 billion.
A day on Mercury lasts longer than a year on Mercury — one rotation takes 59 Earth days, but its orbit only 88.
The Rosetta spacecraft became the first to orbit a comet and land a probe on its surface in 2014.
The first satellite image of Earth was taken in 1959 — it revealed for the first time the planet's cloud patterns from space.
The SETI (Search for Extraterrestrial Intelligence) project has been scanning the skies for alien signals since 1960.
The COBE satellite in 1992 first detected temperature variations in the cosmic microwave background, confirming Big Bang models.
The asteroid belt was discovered one piece at a time — Ceres (1801) was the first, initially classified as a planet.
The Hubble Space Telescope's Deep Field image revealed thousands of galaxies in a patch of sky the size of a grain of sand.
The Challenger Deep was first explored by a manned vehicle (Trieste) in 1960 — only a handful of visits have occurred since.