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Space Facts
977 facts in Space. Click any fact to see its full page.
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The highest parachute jump without a suit was from the International Space Station — hypothetically lethal.
The International Space Station has been continuously inhabited since November 2, 2000.
The first human spacewalk was performed by Soviet cosmonaut Alexei Leonov in 1965 — he nearly couldn't get back in.
The Voyager probes are the only human-made objects to have entered interstellar space.
The highest altitude reached without supplemental oxygen was 8,848 m — the summit of Everest, climbed by Reinhold Messner in 1978.
Felix Baumgartner broke the sound barrier in freefall in 2012, jumping from 39 km altitude.
Bobsled teams sometimes include track and field sprinters — the push at the start is the most critical phase.
The first artificial satellite, Sputnik, weighed 83 kg and beeped a radio signal that could be heard by anyone with a shortwave radio.
The Earth has at least two quasi-satellites — asteroids that orbit the Sun in sync with Earth.
The Tonga volcanic eruption in 2022 was the most powerful explosion recorded in the modern era.
The Earth's geomagnetic pole wanders and is currently moving toward Siberia at about 50–60 km per year.
The Earth loses about 95,000 tons of hydrogen and helium to space each year.
The Earth's magnetic field has reversed hundreds of times — the last reversal was about 780,000 years ago.
The Earth's inner core rotates slightly faster than the rest of the planet.
Pluto has a heart-shaped nitrogen glacier called Tombaugh Regio — discovered by New Horizons in 2015.
The Hercules-Corona Borealis Great Wall is the largest known structure in the universe — about 10 billion light-years across.
The temperature of the cosmic microwave background radiation today is 2.725 Kelvin — just barely above absolute zero.
Interstellar molecules include alcohol, sugar, and even amino acids — the building blocks of life exist throughout space.
Stellar nurseries like the Eagle Nebula's 'Pillars of Creation' have already been destroyed by a nearby supernova — we just haven't seen the light yet.
The universe has no edge — it curves back on itself like the surface of a sphere in higher dimensions.
White dwarfs are about the size of Earth but pack the mass of the Sun.
The Milky Way galaxy takes about 225–250 million years to complete one rotation — called a galactic year.
Space is expanding — distant galaxies move away from us at speeds proportional to their distance.
The nearest star system to Earth, Alpha Centauri, is 4.37 light-years away — about 41 trillion kilometers.
Gamma-ray bursts release more energy in seconds than the Sun will produce in its entire 10-billion-year life.
The Big Crunch, Big Rip, and Heat Death are competing theories for the ultimate fate of the universe.
Brown dwarfs are 'failed stars' — too massive to be planets but not massive enough to sustain nuclear fusion.
The universe's first 380,000 years are called the Dark Ages — no light could escape the opaque plasma.
The sun will eventually become a red giant, expanding to engulf Mercury, Venus, and possibly Earth.
Rogue planets outnumber stars in some estimates — they drift through space without any host star.
The Andromeda Galaxy contains roughly 1 trillion stars — 2–3 times more than the Milky Way.
Type Ia supernovae are used as 'standard candles' to measure cosmic distances because they all explode with the same brightness.
Some black holes are rotating so fast that space itself is dragged around them — the Lense-Thirring effect.
The moon Enceladus of Saturn shoots water vapor geysers 500 km into space from cracks in its icy surface.
Quasars are so bright they can outshine their host galaxies by 1,000 times.
The universe was opaque for the first 380,000 years — light couldn't travel freely until it cooled enough for atoms to form.
Red dwarf stars are the most common type in the galaxy and can live for trillions of years.
The oldest known stars in the universe are called Population III stars — none have been directly observed yet.
The cosmic web connects all galaxy clusters through vast filaments of dark matter and gas.
Interstellar space is not truly empty — it contains about 1 atom per cubic centimeter.
The Milky Way's black hole, Sagittarius A*, flares in X-rays several times daily.
The Great Wall of galaxies is one of the largest known structures — a supercluster filament 1.37 billion light-years long.
Gravitational lensing allows astronomers to observe objects behind massive galaxy clusters, bent by gravity.
The surface of the Sun is actually cooler than its outer atmosphere — a mystery called the coronal heating problem.
The James Webb Space Telescope can observe galaxies that formed just 300 million years after the Big Bang.
A magnetar's magnetic field is 1,000 trillion times stronger than Earth's.
Binary star systems — two stars orbiting each other — are more common than single stars like our Sun.
The first stars in the universe were massive, metal-free, and burned out within a few million years.
The universe is not centered anywhere — every point in space sees all other points receding.
Neutron stars can spin 700 times per second — the surface moves at 20% of the speed of light.