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2 médias trouvés pour 'Leistungsstarkes Licht'

Lightship
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Abell 2218 galaxy cluster in the Dragon - Gravitational lenses in the galaxy cluster Abell 2218 - The Abell 2218 galaxy cluster is located about 2 billion years ago - light from Earth in the constellation of the Dragon. It is so massive that its gravity curved and amplifies the light from other galaxies located behind it. Thus, these galaxies appear on this cliche obtained by the Hubble space telescope in the form of arcs. Abell 2218 resides in the constellation Draco, some 2 billion light - years from Earth. The cluster is so massive that its enormous gravitational field deflects light rays passing through it, much as an optical lens bends light to form an image. This phenomenon, called gravitational lensing, magnifies, brightens, and distorts images from faraway objects. The cluster's magnifying powers provides a powerful “” zoom lens”” for viewing distant galaxies that could not normally be observed with the largest telescopes. This useful phenomenon has produced the arc - shaped patterns found throughout the Hubble picture. These “” arcs”” are the distorted images of very distant galaxies, which lie 5 to 10 times farther than the lensing cluster. This distant population existed when the universe was just a quarter of its present age. Through gravitational lensing these remote objects are magnified, enabling scientists to study them in more detail. This analysis provides a direct glimpse of how star - forming regions are distributed in remote galaxies and yields other clues to the early evolution of galaxies. The picture is dominated by spiral and elliptical galaxies. Resembling a string of tree lights, the biggest and brightest galaxies are members of the foreground cluster. Researchers are intrigued by a tiny red dot just left of top center. This dot may be an extremely remote object made visible by the cluster's magnifying powers. The colors in this picture yield clues to the ages, distances, and temperatures of stars, the stuff of galaxies. Blu