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File:A Horseshoe Einstein Ring from Hubble.JPG

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English: 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 distant blue galaxy. More typically, such light bending results in two discernible images of the distant galaxy, but here the lens alignment is so precise that the background galaxy is distorted into a horseshoe -- a nearly complete ring. Since such a lensing effect was generally predicted in some detail by Albert Einstein over 70 years ago, rings like this are now known as Einstein Rings. Although LRG 3-757 was discovered in 2007 in data from the Sloan Digital Sky Survey (SDSS), the image shown above is a follow-up observation taken with the Hubble Space Telescope's Wide Field Camera 3. Strong gravitational lenses like LRG 3-757 are more than oddities -- their multiple properties allow astronomers to determine the mass and dark matter content of the foreground galaxy lenses. (citation from APOD)
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這是一張修飾過的圖片,即本圖片是用軟體修改過後的版本,修改的方式或內容有:Cropped。原版圖片來源:Lensshoe hubble.jpg。修改者:Bulwersator

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Public domain 本作品由NASA創作,屬於公有領域。根據NASA的版權政策:“NASA的創作除非另有聲明否則不受版權保護。”(參見:Template:PD-USGov/zhNASA版權政策JPL圖像使用政策
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This image is a derivative work of the following images:

  • File:Lensshoe_hubble.jpg licensed with PD-USGov-NASA
    • 2011-12-21T11:34:12Z Bulwersator 3235x2572 (5228638 Bytes) {{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 th

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Image of LRG 3-757, an example of a galaxy's light distorted by gravitational lensing

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目前2011年12月21日 (三) 11:35於 2011年12月21日 (三) 11:35 版本的縮圖1,014 × 670(109 KB)Bulwersator== {{int:filedesc}} == {{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 fro

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