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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
Quizzes
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
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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?
Discover
Illustration for Demystified "How Dangerous is Quicksand"
How Deadly Is Quicksand?
NBA Lakers Celtics Finals Kevin Garnett shooting.
10 Great Sports Rivalries
Marriage. A couple getting married during a church wedding ceremony. (religion, ceremony, bride, groom)
The Seven Sacraments of the Roman Catholic church
African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.
Timeline of the American Civil Rights Movement
All Saints Day. All Souls Day. Candles in cemetery in Poland on All Saints Day, November 1. All Souls Day, November 2. Christian church, All Hallows, Solemnity of All Saints, Feast of All Saints, purgatory, Roman Catholic church
7 Unique Burial Rituals Across the World
July, 2006, Launch of Space Shuttle Discovery STS-121. See attached for full caption information.
Will Light-Speed Space Travel Ever Be Possible?
Agnes with a lamb near her feet. St. Agnes (Saint Agnes) design drawing for stained glass window by J&R Lamb Studios, ink, mount size 10.5 x 14.5 in.
Roman Catholic Saints

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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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Key People

Edwin Hubble
Edwin Hubble
American astronomer
Willem de Sitter
Dutch mathematician and astronomer
Vesto Slipher
American astronomer

Related Quizzes and Features

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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