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Space Facts
977 facts in Space. Click any fact to see its full page.
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Exoplanets have been discovered in habitable zones around distant stars.
Some stars collapse into black holes at the end of their life cycle.
The universe is estimated to be about 13.8 billion years old.
The center of the Milky Way contains a supermassive black hole.
Cosmic rays constantly bombard Earth from space.
The Sun occasionally emits powerful solar flares.
The Kuiper Belt contains many icy bodies beyond Neptune.
Supernovae can briefly outshine entire galaxies.
The event horizon marks the boundary around a black hole.
Some exoplanets orbit two stars at once.
Black holes can merge and release enormous energy.
The Milky Way and Andromeda galaxies are on a slow collision course.
Magnetars have extremely powerful magnetic fields.
The observable universe spans billions of light-years.
Some pulsars emit beams of radiation like cosmic lighthouses.
Rogue planets drift through space without orbiting a star.
Cosmic microwave background radiation is evidence of the early universe.
Some galaxies contain supermassive black holes millions of times the Sun’s mass.
Interstellar objects have passed through our solar system.
The Fermi Paradox questions why extraterrestrial life has not been observed.
Gamma-ray bursts are among the most energetic events observed in the universe.
Quasars are extremely bright objects powered by supermassive black holes.
The Oort Cloud is a theoretical shell of icy objects surrounding the solar system.
Some stars appear to dim irregularly for reasons that are still studied.
Black holes can bend light through gravitational lensing.
Neutron stars can spin hundreds of times per second.
The Great Attractor is a gravitational anomaly influencing the motion of galaxies.
Dark energy is thought to drive the accelerating expansion of the universe.
The Wow! signal was a strong radio signal detected in 1977 that has never been fully explained.
Fast radio bursts are powerful millisecond-long radio pulses from distant galaxies.
The telescope expanded understanding of the universe.
The International Space Station orbits Earth every 90 minutes.
The International Space Station is one of the most complex engineering projects ever built.
Project Mercury was the first U.S. human spaceflight program.
Project Blue Book investigated reports of unidentified flying objects.
The Hubble Space Telescope revolutionized deep-space imaging.
The Voyager probes have traveled beyond the heliosphere.
The Kepler mission searched for Earth-like exoplanets.
The Vostok 1 mission marked the first human spaceflight.
The Pioneer 10 spacecraft was the first to travel through the asteroid belt.
The Bell Labs experiment led to the discovery of the cosmic microwave background.
The Apollo 11 mission successfully landed humans on the Moon.
The Mars Pathfinder mission tested new landing techniques.
The Rosetta mission successfully landed a probe on a comet in 2014.
The Voyager Golden Record was sent into space containing sounds and images from Earth.
The Yellowstone supervolcano is one of the largest volcanic systems in the world.
In 1977, a strong narrowband radio signal known as the 'Wow! signal' was detected from space.
In 1977, a mysterious signal known as the 'Wow! signal' was detected from space.
The Earth's atmosphere gradually fades into space.
The Moon's gravity affects ocean tides.