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Space Facts
977 facts in Space. Click any fact to see its full page.
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The Deep Impact mission fired a 370 kg copper impactor into Comet Tempel 1 at 10 km/s.
The Stardust mission collected comet particles from Comet Wild 2 in 2004 and returned them to Earth.
The Dawn spacecraft orbited both Vesta and Ceres — the first mission to orbit two extraterrestrial bodies.
Juno discovered that Jupiter's interior is 'fuzzy' — with a diffuse, extended core rather than a compact one.
The Cassini spacecraft found that Enceladus has the chemistry for life — hydrogen, carbon dioxide, and organics in its geysers.
Chandrayaan-1 confirmed water ice at the Moon's poles in 2009 — a surprising finding with implications for lunar habitation.
The Lunar Reconnaissance Orbiter has photographed the Apollo landing sites — the equipment is still visible.
Mars Express has been orbiting Mars since 2003 — and found evidence of a subglacial lake in 2018.
The MESSENGER spacecraft mapped Mercury in detail — finding ice in permanently shadowed polar craters.
The Galileo spacecraft dropped a probe into Jupiter's atmosphere in 1995 — surviving for 57 minutes before being crushed.
The first close-up images of Jupiter were sent by Pioneer 10 in 1973 — after a journey of 21 months.
A day on Earth was once only 6 hours long — the Moon's gravity has been gradually slowing Earth's rotation.
High-altitude flying exposes aircrew to cosmic radiation — pilots and flight attendants have elevated lifetime radiation exposure.
The first animal in space was Laika, a Soviet dog, in 1957 — she survived the launch but died from overheating.
The Hubble Space Telescope has an orbital altitude of only 547 km — well within Earth's atmosphere.
The Voyager 1 probe, launched in 1977, is now over 23 billion kilometers from Earth.
The International Space Station travels at 28,000 km/h — completing an orbit every 90 minutes.
The Hubble constant — the universe's expansion rate — has been measured with increasing precision since the 1920s.
The Hubble Space Telescope, launched in 1990, revealed galaxies in the 'deep field' photos — demonstrating the universe's scale.
The Moon landing in 1969 was achieved by 400,000 engineers — and the mission computer had less power than a modern pocket calculator.
The discovery of the cosmic microwave background radiation in 1965 confirmed the Big Bang theory.
Diamonds rain on Neptune and Uranus — carbon under extreme pressure forms diamond crystals that fall through the atmosphere.
The first photograph ever taken of another planet was of Mars — by the Mariner 4 probe in 1965.
The magnetic north pole moves about 55 km per year and has moved 2,400 km since it was first measured in 1831.
Plasma — the fourth state of matter — makes up 99% of visible matter in the universe.
The Milky Way contains an estimated 100–400 billion stars.
White dwarfs cool over trillions of years — eventually becoming cold, dark 'black dwarfs.'
The oldest known star is Methuselah (HD 140283) — estimated to be 13.8 billion years old, nearly as old as the universe.
The nearest star to Earth (other than the Sun) is Proxima Centauri — 4.24 light-years away.
Stellar winds from massive stars sculpt nebulae — creating pillars, bubbles, and cavities in the gas.
The helium flash marks the moment a red giant star begins fusing helium — it occurs explosively over minutes.
Stars in the galactic bulge are generally older than those in the spiral arms.
Red dwarfs are the most common stars — they're dim, long-lived, and make up 75% of all stars in the Milky Way.
Betelgeuse, the red supergiant shoulder star of Orion, is expected to explode as a supernova within 100,000 years.
The Orion Nebula, visible to the naked eye, is a stellar nursery — thousands of stars are forming within it.
Hypernovae — more powerful than supernovae — are thought to produce long-duration gamma-ray bursts.
Brown dwarfs form like stars but lack the mass to sustain nuclear fusion — they're between giant planets and stars.
T Tauri stars are young protostars that have not yet begun hydrogen fusion — they're active and variable.
A magnetar's magnetic field is so intense that at a distance of 1,000 km, it would erase all data on hard drives.
Wolf-Rayet stars are massive, extremely hot, and losing mass rapidly through powerful stellar winds.
Variable stars change brightness periodically — Cepheid variables are used as distance markers across the cosmos.
Pulsars emit radiation beams from their magnetic poles — if those beams sweep Earth, they appear to pulse.
Binary star systems — two stars orbiting each other — are more common than single stars like the Sun.
Neutron stars are so dense that a cubic centimeter of neutron star material weighs a billion tons.
Our Sun is a yellow dwarf star — it will become a red giant in about 5 billion years.
The life span of a star is inversely related to its mass — more massive stars burn faster and die younger.
Stars are born in nebulae — vast clouds of gas and dust that collapse under gravity.
The International Space Station required 42 assembly flights and over 200 spacewalks to construct.
The solar system's outer edge — the Oort Cloud — extends halfway to the nearest star.
The Moon's gravity stabilizes Earth's axial tilt — without it, Earth's climate would be far more extreme.