expanding universe

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Learn about space expansion and why gravity and electromagnetism are not affected when space expands

Einstein, the big bang, and the expansion of the universe

Understand the theoretical model of dark energy and the acceleration of the universe

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Galaxy clusters like Abell 2744 can act as a natural cosmic lens, magnifying light from more distant, background objects through gravity. NASA's James Webb Space Telescope may be able to detect light from the first stars in the universe if they are gravitationally lensed by such clusters. (astronomy, space exploration, galaxies)

How Fast Is the Universe Expanding?

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Illustration for Demystified "How Dangerous is Quicksand"

How Deadly Is Quicksand?

Shadow of a man holding large knife in his hand inside of some dark, spooky buiding

7 of History's Most Notorious Serial Killers

Panoramic view of moai, Ahu Tongariki, Easter Island (Rapa Nui), Chile

8 of the World’s Most-Remote Islands

Bakers Dozen of Donuts, or Paczki's

Why Is a Baker’s Dozen 13?

The Fortune-Teller, oil on canvas by Georges de La Tour, probably the 1630s; in the Metropolitan Museum of Art, New York City. (101.9 x 123.5 cm.) (The Fortune Teller)

10 Paintings You Should See at the Met in New York City

Turtle, tortoise, reptile. Uses assets 88582 & 89606

What’s the Difference Between a Turtle and a Tortoise?

Estimated battle casualties, Normandy invasion, World War II. WWII, D-Day

Estimated Battle Casualties During the Normandy Invasion and Campaign to Liberate Paris (June–August 1944)

expanding universe: Related Content

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Videos

Learn about space expansion and why gravity and electromagnetism are not affected when space expands

Einstein, the big bang, and the expansion of the universe

Understand the theoretical model of dark energy and the acceleration of the universe

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Topics

Hubble’s law closed universe open universe redshift closure density Mössbauer effect thermal red-shift gravitational red shift Hubble time Hubble constant big-bang model eclipse gravity space-time Olbers’ paradox cosmological constant star Sun galaxy cosmology solar system

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astronomy: Galaxies and the expanding universe

Key People

Edwin Hubble

Edwin Hubble

American astronomer

Willem de Sitter

Dutch mathematician and astronomer

Vesto Slipher

American astronomer

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.

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