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Many galaxies formed fast after the Big Bang, but about half of them suddenly stopped making new stars and it looks like this is literally because they ran out of gas. And with new instruments and techniques, we are now finding lost galaxies hidden in dust!
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Sources:
https://www.nasa.gov/feature/goddard/2021/hubble-finds-early-massive-galaxies-running-on-empty
https://www.almaobservatory.org/en/press-releases/alma-scientists-uncover-the-mystery-of-early-massive-galaxies-running-on-empty/
https://www.eurekalert.org/news-releases/928722
https://doi.org/10.1038/s41586-021-03806-7
https://www.sciencedaily.com/releases/2021/09/210922121803.htm
https://www.nature.com/articles/s41586-021-03846-z
Image Sources:
https://svs.gsfc.nasa.gov/11534
https://www.nasa.gov/image-feature/star-formation-in-the-constellation-of-gemini-the-twins
https://commons.wikimedia.org/wiki/File:View_of_the_Very_Large_Telescope.jpg
https://www.eurekalert.org/multimedia/800363
https://www.jwst.nasa.gov/content/science/firstLight.html
https://commons.wikimedia.org/wiki/File:The_Hubble_Space_Telescope_in_orbit.tif
https://commons.wikimedia.org/wiki/File:ALMA_and_a_Starry_Night.jpg
https://www.nasa.gov/mission_pages/chandra/images/astronomers-pursue-renegade-supermassive-black-hole.html
https://svs.gsfc.nasa.gov/12656
https://en.wikipedia.org/wiki/Reionization#/media/File:Reion_diagram.jpg
https://science.nasa.gov/ems/10_ultravioletwaves
https://commons.wikimedia.org/wiki/File:NASA-WMAP-first-stars.jpg
https://www.jwst.nasa.gov/content/science/firstLight.html
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