Quantitative predictions are difficult because of feedback effects; as a massive star forms, it produces intense radiation and matter outflows that may blow away some of the gas in the collapsing clump. Some of the stars would have exploded as supernovae at the end of their lives, expelling the metals they produced by fusion reactions. Then astronomers may be able to observe directly how a dark, featureless universe formed the brilliant panoply of objects that now give us light and life. What did the first stars look like? https://www.youtube.com/channel/UCUHI67dh9jEO2rvK–MdCSg, Support us at: https://www.patreon.com/universetoday When images are obtained of NGC 5253 at progressively longer wavelengths, cf. They combined with one another. How long did it take, and what did these first stars like? These properties are similar to those of the molecular gas clouds in which stars are currently forming in the Milky Way, but the first protogalaxies would have differed in some fundamental ways. NGC 5253 is one of the nearest of the known Blue Dwarf Galaxies; it is located at a distance of about 11 million light-years in the direction of the southern constellation Centaurus. Just take a look at Messier 92, a star cluster within our galaxy. Helium requires more energy to ionize than hydrogen does, but if the first stars were as massive as predicted, they would have ionized helium at the same time. Follow us on Twitter: @universetoday Furthermore, the cosmological models can provide, in principle, a complete description of the initial conditions that preceded the first generation of stars. Some of them are still around. These stars occupy merely a small nearby part of the Milky Way galaxy; telescopes reveal a much vaster realm that shines with the light from billions of galaxies. Join us at patreon.com/universetoday, https://www.darkskytraveller.com.au/fredwatson, Space Nuts Podcast https://podcasts.apple.com/ca/podcast/space-nuts-astronomy-space-and-science-news/id1080090608, Our Book is out! Compression would heat the gas to temperatures above 1,000 kelvins. Until the temperature dropped to that level—which happened about two billion years after the big bang—the process of star formation may still have favored massive stars. 7 billion years old. https://www.youtube.com/channel/UCUHI67dh9jEO2rvK–MdCSg, Support us at: https://www.patreon.com/universetoday With enough nuclear reactions happening, the cloud of gas compresses and creates a glow. A major dust lane is visible at the western (right) side of the galaxy, but patches of dust are visible all over, together with a large number of colourful stars and stellar clusters. The uniformity of this radiation indicates that matter was distributed very smoothly at that time. Because metals are much more effective than hydrogen in cooling star-forming clouds and allowing them to collapse into stars, the production and dispersal of even a small amount could have had a major effect on star formation. Because of the more compact structure, the surface layers of the star would also be hotter. They were big emitters of ultraviolet light. On Earth, it’s a way to produce energy. The distribution of the masses of the cluster stars ressembles that observed in clusters in other starburst galaxies, but the large number of young clusters and stars is extraordinary in a galaxy as small as NGC 5253. Click to share on Facebook (Opens in new window), Click to share on Pocket (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Tumblr (Opens in new window), Click to share on Pinterest (Opens in new window), Click to share on Reddit (Opens in new window), Click to email this to a friend (Opens in new window), SpaceShipTwo Pilot’s Survival is Miraculous, https://podcasts.apple.com/ca/podcast/space-nuts-astronomy-space-and-science-news/id1080090608, https://www.amazon.com/Universe-Today-Ultimate-Viewing-Cosmos/dp/1624145442/, https://itunes.apple.com/us/podcast/universe-today-guide-to-space-audio/id794058155?mt=2, https://www.youtube.com/playlist?list=PLbJ42wpShvmkjd428BcHcCEVWOjv7cJ1G, https://www.youtube.com/channel/UC0-KklSGlCiJDwOPdR2EUcg/, https://www.youtube.com/channel/UCUHI67dh9jEO2rvK–MdCSg, https://www.youtube.com/channel/UCEItkORQYd4Wf0TpgYI_1fw, Episode 693: Open Space 92: Why I Hate Embargoed News Stories, and More…, Episode 692: Open Space 91: Any Updates on Venus?
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