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universe
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Images & Videos
Examine the observable universe's place within the whole universe
The scale of the universe: Earth's solar system and beyond
How did Ptolemy explain retrograde motion?
Eratosthenes' method of measuring Earth's circumference
Aristotle's theory of the solar system explained
Copernicus's revolutionary theory: The Sun as the center
Galileo's telescopes photosphere of the Sun
Kepler's revolutionary laws of planetary motion
Halley's Comet
For Students
universe summary
Quizzes
View of the Andromeda Galaxy (Messier 31, M31).
Astronomy and Space Quiz
The orbits of the planets and other elements of the solar system, including asteroids, Kuiper belt, Oort cloud, comet
Space Odyssey
Ursa major constellation illustration art. (Big Dipper) stars, space, night sky)
Stars: Explosions in Space
Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.
All About Astronomy
Related Questions
Read Next
Remarkable new details of Pluto's largest moon Charon are revealed in this image from New Horizons' Long Range Reconnaissance Imager (LORRI), taken late on July 13, 2015 from a distance of 289,000 miles
Why Is Pluto No Longer a Planet?
Large Magellanic Cloud (LMC) new star formation. Satellite galaxy of the Milky Way. This galaxy is scattered with glowing nebulae, the most noticeable sign that new stars are being born.
Was the Big Bang Actually an Explosion?
Spiral Galaxy type Sa-Sb or Sa/Sb in the constellation Virgo. The majestic Sombrero Galaxy Messier 104 (M104) or NGC 4594. The team took six pictures of the galaxy, stitched them together to create the final composite image. Photo from May-June 2003
9 Britannica Articles That Explain the Meaning of Life
Solar system illustration. (Sun; planets)
A Model of the Cosmos
Colorful winter sunset
What's the Difference Between a Solstice and an Equinox?
Discover
Amendments 1-10 to the Constitution of the United States constitute what is known as the Bill of Rights on an American flag.
What Is the Emoluments Clause?
Ethel Rosenberg arrested in August 1950. Photograph dated Aug. 8, 1950. American civilians executed for espionage. Spies, communists, Julius Rosenberg
Spies Like Us: 10 Famous Names in the Espionage Game
Drinking water is poured into a glass.
Water Fluoridation: Just the Facts
Aurochs. Bos primigenius. Skeleton. Extinct animal. Skeleton of an Aurochs, an extinct wild ox.
6 Animals We Ate Into Extinction
King Cobra snake in Malaysia. (reptile)
9 of the World’s Deadliest Snakes
Happy, smiling, flying pig
7 Everyday English Idioms and Where They Come From
US Marines firing at Fallujah, Iraq, during the Second Battle of Fallujah in November 2004. Operation Iraqi Freedom, Iraq War.
Timeline of the 2000s

universe: Related Content

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News •

Scientists in race to discover why our Universe exists • May 20, 2025, 10:05 AM ET (BBC)
Universe will die "much sooner than expected," new research says • May 13, 2025, 8:17 AM ET (CBS)
'Largest structure in the universe' is even bigger than astronomers imagined and still a huge mystery • May 8, 2025, 12:14 AM ET (Earth.com)
Largest Structure in The Universe May Be 50% Larger Than We Thought • Apr. 26, 2025, 4:18 AM ET (ScienceAlert)

Photos and Videos

Eratosthenes' method of measuring Earth's circumference
Galileo's telescopes
photosphere of the Sun
Halley's Comet
Stellar parallax
globular cluster M80
galaxy
Pinwheel Galaxy (M101)
Andromeda Galaxy
galaxy types
Examine the observable universe's place within the whole universe
The scale of the universe: Earth's solar system and beyond
How did Ptolemy explain retrograde motion?
Aristotle's theory of the solar system explained
Copernicus's revolutionary theory: The Sun as the center
See All Videos and Images →

Related Topics and References

Topics
Dig Deeper: More Articles That Discuss This Topic

Key People

Democritus
Democritus
Greek philosopher
James Peebles
American physicist
Fred Hoyle
Sir Fred Hoyle
British mathematician and astronomer
Pierre-Louis Moreau de Maupertuis
French mathematician and astronomer
Saul Perlmutter
Saul Perlmutter
American physicist

Related Quizzes and Features

Quiz
Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.
All About Astronomy
View of the Andromeda Galaxy (Messier 31, M31).
Astronomy and Space Quiz
View of the Andromeda Galaxy (Messier 31, M31).
Astronomy and Space Quiz
Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.
All About Astronomy
Ursa major constellation illustration art. (Big Dipper) stars, space, night sky)
Stars: Explosions in Space
The orbits of the planets and other elements of the solar system, including asteroids, Kuiper belt, Oort cloud, comet
Space Odyssey
List
Spiral Galaxy type Sa-Sb or Sa/Sb in the constellation Virgo. The majestic Sombrero Galaxy Messier 104 (M104) or NGC 4594. The team took six pictures of the galaxy, stitched them together to create the final composite image. Photo from May-June 2003
9 Britannica Articles That Explain the Meaning of Life
Demystified
Remarkable new details of Pluto's largest moon Charon are revealed in this image from New Horizons' Long Range Reconnaissance Imager (LORRI), taken late on July 13, 2015 from a distance of 289,000 miles
Why Is Pluto No Longer a Planet?
Large Magellanic Cloud (LMC) new star formation. Satellite galaxy of the Milky Way. This galaxy is scattered with glowing nebulae, the most noticeable sign that new stars are being born.
Was the Big Bang Actually an Explosion?
Colorful winter sunset
What's the Difference Between a Solstice and an Equinox?