File:A window into the cosmic past (26350299758).jpg

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Description	This image from the NASA/ESA Hubble Space Telescope shows the galaxy cluster PLCK G004.5-19.5. It was discovered by the ESA Planck satellite through the Sunyaev-Zel’dovich effect — the distortion of the cosmic microwave background radiation in the direction of the galaxy cluster, by high energy electrons in the intracluster gas. The large galaxy at the centre is the brightest galaxy in the cluster and the dominant object in this image, and above it a thin, curved gravitational lens arc is visible. This is caused by the gravitational forces of the cluster bending the light from stars and galaxies behind it, in a similar way to how a glass lens bends light. More information: <a href="https://www.spacetelescope.org/images/potw1807a/" rel="nofollow">www.spacetelescope.org/images/potw1807a/</a> Credit: ESA/Hubble & NASA, RELICS Acknowledgement: D. Coe et al.
Date	25 January 2018, 17:05
Source	A window into the cosmic past
Author	Hubble ESA

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This image was originally posted to Flickr by Hubble Space Telescope / ESA at https://flickr.com/photos/51268976@N08/26350299758. It was reviewed on 7 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

7 December 2020

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current	15:19, 7 December 2020		1,280 × 1,097 (262 KB)	Eyes Roger (talk \| contribs)	Transferred from Flickr via #flickr2commons

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Credit/Provider	ESA/Hubble & NASA, RELICS
Source	ESA/Hubble
Short title	A window into the cosmic past
Image title	This image from the NASA/ESA Hubble Space Telescope shows the galaxy cluster PLCK G004.5-19.5. It was discovered by the ESA Planck satellite through the Sunyaev-Zel’dovich effect — the distortion of the cosmic microwave background radiation in the direction of the galaxy cluster, by high energy electrons in the intracluster gas. The large galaxy at the centre is the brightest galaxy in the cluster and the dominant object in this image, and above it a thin, curved gravitational lens arc is visible. This is caused by the gravitational forces of the cluster bending the light from stars and galaxies behind it, in a similar way to how a glass lens bends light. Several stars are visible in front of the cluster — recognisable by their diffraction spikes— but aside from these, all other visible objects are distant galaxies. Their light has become redshifted by the expansion of space, making them appear redder than they actually are. By measuring the amount of redshift, we know that it took more than 5 billion years for the light from this galaxycluster to reach us. The light of the galaxies in the background had to travel for even longer than that, making this image an extremely old window into the far reaches of the Universe. This image was taken by Hubble’s Advanced Camera for Surveys (ACS) and Wide-Field Camera 3 (WFC3) as part of anobserving programme called RELICS (Reionization Lensing Cluster Survey). RELICS imaged 41 massive galaxy clusters with the aim of finding the brightest distant galaxies for the forthcoming NASA/ESA/CSA James Webb Space Telescope (JWST) to study.
Usage terms	Creative Commons Attribution 4.0 International License
Date and time of data generation	06:00, 12 February 2018
Software used	Adobe Photoshop CC 2017 (Windows)
File change date and time	17:05, 25 January 2018
Date and time of digitizing	21:02, 14 July 2017
Date metadata was last modified	18:05, 25 January 2018
Unique ID of original document	xmp.did:d4f553b3-28fb-b34d-a872-76778025b1a3
Keywords	PLCK G004.5-19.5
Contact information	http://www.spacetelescope.org Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany
IIM version	4

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