File:NASA's Webb Draws Back Curtain on Universe's Early Galaxies (Inset boxes only) (52506389923).png

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A long time ago… in galaxies far far away, the first stars were born in the early universe. But when and how? That’s a mystery Webb is one step closer to solving.

Using Webb, researchers have found two early galaxies that are unusually bright, one of which could contain the most distant starlight ever seen. The galaxies are thought to have existed 350 and 450 million years after the big bang (respectively, from top to bottom). Unlike our Milky Way, these first galaxies are small and compact, with spherical or disk shapes rather than grand spirals.

Webb’s new findings suggest that the galaxies would have had to begin coming together about 100 million years after the big bang — meaning that the first stars might have started forming in such galaxies around that time, much earlier than expected.

Follow-up observations with Webb’s spectrographs will confirm the distances of these primordial galaxies and help us learn more about the earliest stars. More: www.nasa.gov/feature/goddard/2022/nasa-s-webb-draws-back-...

Credit: NASA, ESA, CSA, Tommaso Treu (UCLA)

Image description: Two side-by-side, labeled boxes highlight close-ups from Webb’s images of the giant galaxy cluster Abell 2744. At left is Box 1, which shows a central reddish dot surrounded by pastel, blurry streaks of other foreground galaxies against a black background. This dot is a galaxy thought to have existed 350 million years after the big bang, which would make it the farthest detected galaxy if confirmed. On the right is Box 2, which shows a small reddish disk at its center. This is a galaxy thought to have existed 450 million years after the big bang. Also in this box are a few other foreground galaxies, seen as faint blue, blurry dots against a black background.
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Source NASA's Webb Draws Back Curtain on Universe's Early Galaxies (Inset boxes only)
Author NASA's James Webb Space Telescope from Greenbelt, MD, USA

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This image was originally posted to Flickr by James Webb Space Telescope at https://flickr.com/photos/50785054@N03/52506389923. It was reviewed on 6 June 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6 June 2023

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