File:Distant and ancient SPT0615-JD.jpg

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Credit/Provider	ESA/Hubble & NASA, I. Karachentsev et al., F. High et al.
Source	ESA/Hubble
Short title	Distant and ancient
Image title	Dotted across the sky in the constellation of Pictor (The Painter’s Easel) is the galaxy cluster highlighted here by the NASA/ESA Hubble Space Telescope: SPT-CL J0615-5746, or SPT0615 for short. First discovered by the South Pole Telescope less than a decade ago, SPT0615 is exceptional among the myriad clusters so far catalogued in our map of the Universe — it is the highest-redshift cluster for which a full, strong lens model is published. SPT0615 is a massive cluster of galaxies, one of the farthest observed to cause gravitational lensing. Gravitational lensing occurs when light from a background object is deflected around mass between the object and the observer. Among the identified background objects, there is SPT0615-JD, a galaxy that is thought to have emerged just 500 million years after the Big Bang. This puts it among the very earliest structures to form in the Universe. It is also the farthest galaxy ever imaged by means of gravitational lensing. Just as ancient paintings can tell us about the period of history in which they were painted, so too can ancient galaxies tell us about the era of the Universe in which they existed. To learn about cosmological history, astronomers explore the most distant reaches of the Universe, probing ever further out into the cosmos. The light from distant objects travels to us from so far away that it takes an immensely long time to reach us, meaning that it carries information from the past — information about the time at which it was emitted. By studying such distant objects, astronomers are continuing to fill the gaps in our picture of what the very early Universe looked like, and uncover more about how it evolved into its current state.
Usage terms	Creative Commons Attribution 4.0 International License
Date and time of data generation	06:00, 6 May 2019
Software used	Adobe Photoshop CC 2019 (Windows)
File change date and time	16:01, 12 February 2019
Date and time of digitizing	19:19, 20 January 2019
Date metadata was last modified	17:01, 12 February 2019
Unique ID of original document	xmp.did:9ec78b08-d96f-6a48-ba6e-2bb04e20cf3f
Keywords	SPT0615-JD SPT-CL J0615-5746
Contact information	http://www.spacetelescope.org Karl-Schwarzschild-Strasse 2 Garching bei München, None, D-85748 Germany

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