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  • 21 Aug, 2019

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File:Lensshoe Hubble.jpg

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"An interesting galaxy has been circled in this NASA/ESA Hubble Space Telescope image. The galaxy— one of a group of galaxies called Luminous Red Galaxies — has an unusually large mass, containing about ten times the mass of the Milky Way. However, it’s actually the blue horseshoe shape that circumscribes the red galaxy that is the real prize in this image. This blue horseshoe is a distant galaxy that has been magnified and warped into a nearly complete ring by the strong gravitational pull of the massive foreground Luminous Red Galaxy. To see such a so-called Einstein Ring required the fortunate alignment of the foreground and background galaxies, making this object’s nickname “the Cosmic Horseshoe” particularly apt. The Cosmic Horseshoe is one of the best examples of an Einstein Ring. It also gives us a tantalising view of the early Universe: the blue galaxy’s redshift — a measure of how the wavelength of its light has been stretched by the expansion of the cosmos —is approximately 2.4. This means we see it as it was about 3 billion years after the Big Bang. The Universe is now 13.7 billion years old. Astronomers first discovered the Cosmic Horseshoe in 2007 using data from the Sloan Digital Sky Survey. But this Hubble image, taken with the Wide Field Camera3, offers a much more detailed view of this fascinating object. This picture was created from images taken in visible and infrared light on Hubble’s Wide Field Camera 3. The field of view is approximately 2.6 arcminutes wide."
Date Source http://apod.nasa.gov/apod/image/1112/lensshoe_hubble_3235.jpg Author ESA/Hubble & NASA Other versions Derivative works of this file:  A Horseshoe Einstein Ring from Hubble.JPG

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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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Gravitational Lensing

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19 December 2011

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Date/TimeThumbnailDimensionsUserComment
current11:34, 21 December 2011Thumbnail for version as of 11:34, 21 December 20113,235 × 2,572 (4.99 MB)Bulwersator{{Information |Description ={{en|1=What's large and blue and can wrap itself around an entire galaxy? A gravitational lens mirage. Pictured above, the gravity of a luminous red galaxy (LRG) has gravitationally distorted the light from a much more dista
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