File:One Galaxy, Three Times.jpg

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English: This star- and galaxy-studded image was captured by Hubble’s Wide Field Camera 3 (WFC3), using data that were collected for scientific purposes. The object of interest was a galaxy that is visible in the bottom right corner of the image, named SGAS 0033+02. What makes this particular galaxy interesting is a little unusual — it appears not just once in this image, but three times. The thrice-visible galaxy is a little difficult to spot: it appears once as a curved arc and twice more as small round dots around the star. SGAS 0033+02’s multiple appearances in the same image are not the result of an error, but instead are due to a remarkable phenomenon known as gravitational lensing. Gravitational lensing occurs when the light from a very distant galaxy — such as SGAS 0033+02 — is curved (or ‘lensed’) by the gravity of a massive celestial object that lies in the foreground, between the distant galaxy and the Earth. SGAS 0033+02 was discovered by its namesake, the Sloan Giant Arcs Survey (SGAS), which aimed to identify highly magnified galaxies that were gravitationally lensed by foreground galaxy clusters. SGAS 0033+02 is of special interest because of its highly unusual proximity in the sky to a very bright star. The star is useful, because it can be used to calibrate and correct observations of the lensed SGAS 0033+02.
Date (released)
Source https://esahubble.org/images/potw2147a/; see also https://www.flickr.com/photos/europeanspaceagency/51705056047/
Author ESA/Hubble & NASA, E. Wuyts

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This file is licensed under the Creative Commons Attribution 4.0 International license.
Attribution: ESA/Hubble & NASA, E. Wuyts
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current18:28, 2 December 2021Thumbnail for version as of 18:28, 2 December 20213,467 × 3,096 (2.75 MB)Pandreve (talk | contribs)Uploaded a work by ESA/Hubble & NASA, E. Wuyts from https://esahubble.org/images/potw2147a/ with UploadWizard

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