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dark matter
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Understand gravitational lenses and the importance of tracking the dark matter
gravitational lens galaxy cluster 1E0657-56 matter-energy content of the universe
Learn about dark matter and its gravitational effects
Hear about Fritz Zwicky and his discovery of the existence of dark matter
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dark matter summary
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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.
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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
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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)
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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
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Solar system illustration. (Sun; planets)
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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.
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Baseball laying in the grass. Homepage blog 2010, arts and entertainment, history and society, sports and games athletics
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Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.
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Woman tied to a ducking stool, a method of punishment by means of humiliation, beating, or death. (cucking stool)
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The Cheshire Cat is a fictional cat from Lewis Carroll's Alice's Adventures in Wonderland. (Alice in Wonderland)
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Iraqi Army Soldiers from the 9th Mechanized Division learning to operate and maintain M1A1 Abrams Main Battle Tanks at Besmaya Combat Training Center, Baghdad, Iraq, 2011. Military training. Iraq war. U.S. Army
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Videos

Understand gravitational lenses and the importance of tracking the dark matter
A discussion of gravitational lenses and the detection of dark matter in galaxies.
Video: © Open University (A Britannica Publishing Partner)
Learn about dark matter and its gravitational effects
A brief lesson on the gravitational effects of dark matter.
Video: © MinutePhysics (A Britannica Publishing Partner)
Hear about Fritz Zwicky and his discovery of the existence of dark matter
Learn about Fritz Zwicky and his inference of the existence of dark matter.
Video: © Open University (A Britannica Publishing Partner)

Images

gravitational lens
A galactic cluster, about five billion light-years away, produces a tremendous gravitational...
Photo AURA/STScI/NASA/JPL (NASA photo # STScI-PRC96-10)
galaxy cluster 1E0657-56
Composite image showing the galaxy cluster 1E0657-56, the Bullet cluster.
X-ray: NASA/CXC/CfA/M.Markevitch Optical: NASA/STScI; Magellan/U.Arizona/D.Clowe Lensing Map: NASA/STScI; ESO WFI; Magellan/U.Arizona/D.Clowe
matter-energy content of the universe
Matter-energy content of the universe.
Encyclopædia Britannica, Inc.
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