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Astronomers using data from NASA’s James Webb Space Telescope have identified dozens of small galaxies that played a starring role in a cosmic makeover that transformed the early universe into the one we know today.
The tiny galaxies were discovered by Wold and his Goddard colleagues, Sangeeta Malhotra and James Rhoads, by sifting through Webb images captured as part of the UNCOVER (Ultradeep NIRSpec and NIRCam ObserVations before the Epoch of Reionization) observing program, led by Rachel Bezanson at the University of Pittsburgh in Pennsylvania.
For much of its first billion years, the universe was immersed in a fog of neutral hydrogen gas. Today, this gas is ionized — stripped of its electrons. Astronomers, who refer to this transformation as reionization, have long wondered which types of objects were most responsible: big galaxies, small galaxies, or supermassive black holes in active galaxies. As one of its main goals, NASA’s Webb was specifically designed to address key questions about this major transition in the history of the universe.
Recent studies have shown that small galaxies undergoing vigorous star formation could have played an outsized role. Such galaxies are rare today, making up only about 1% of those around us. But they were abundant when the universe was about 800 million years old, an epoch astronomers refer to as redshift 7, when reionization was well underway.
In this image, white diamonds show the locations of 20 of the 83 young, low-mass, starburst galaxies found in infrared images of the giant galaxy cluster Abell 2744. This composite incorporates images taken through three NIRCam filters (F200W as blue, F410M as green, and F444W as red). The F410M filter is highly sensitive to light emitted by doubly ionized oxygen — oxygen atoms that have been stripped of two electrons — at a time when reionization was well underway. Emitted as green light, the glow was stretched into the infrared as it traversed the expanding universe over billions of years. The cluster’s mass acts as a natural magnifying glass, allowing astronomers to see these tiny galaxies as they were when the universe was about 800 million years old.
Credit: NASA/ESA/CSA/Bezanson et al. 2024 and Wold et al. 2025
#NASAMarshall #NASA #NASAWebb #JWST #NASAGoddard #galaxy
We don't see his face...but we can almost hear his hands in action. Percussionist Gaurav Malhotra performs during...
City of Decatur (Decatur Square), Georgia, USA.
4 May 2024.
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â–¶ Photographer's notes:
☞ On 3 June 2024, Flickr's editors selected this image for inclusion in Flickr's daily Explore feature (no. 85 out of 500 chosen).
☞ On 2 June 2024, the administrator of the Flickr group, "Environmental Portraits, rejected this photo as NOT being an environmental portrait. Phooey!
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â–¶ Photo and story by: YFGF.
â–¶ For a larger image, type 'L' (without the quotation marks).
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â–¶ Camera: Olympus OM-D E-M10 II.
— Lens: Olympus M.40-150mm F4.0-5.6 R.
— Edit: Photoshop Elements 15, Nik Collection (2016).
â–¶ Commercial use requires explicit permission, as per Creative Commons.
I am really tensed these days.. in a confusion about my career ahead..
Photography has slowly creeped into the forefront and has sent my normal college and animation at a backfoot.
Its like being in two boats at the same time and for sure if i stay like this for long.. I am going to SINK!!!
Need to decide it as soon as possible... the last college project will end soon after which i need to get really focussed on what i want from my life and career..
GUIDE ME TOWARDS THE RIGHT PATH OH! GOD.... SHOW ME THE RAY OF LIGHT...
Explore - 30
Shot for Yakshi Malhotra Knitwear for Venella One Management
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I wish to dedicate this photograph of the flower Gerbera to two people..
First and foremost Soumen Dada, he has been a constant support and enlightment to me since past few months. Despite he is of my dad's age still i have developed a really strong bond and friendship with him. He has been guiding me and teaching me about life , constantly exchanging and sharing his experience about life and giving me valuable lessons and at the same time telling me about photography. He is really a GEM of a person.. hard to find in this world.. so true and pure at heart...
The second one would be undoubtedly Captain Suresh Sharma. I have been following all his flickr posts since sometime and he has been sharing constant information about the learning process.. and also the technique of black background. He is really someone whom i would look up to and idealize. Thank you so much sir for the constant shower of knowledge, please keep on sharing more with us..