On Sat, Aug 12, 2023 at 11:40 PM LizR <[email protected]> wrote: *> I don't suppose this could be one of them?* > > > https://www.nasa.gov/feature/goddard/2023/webb-reveals-colors-of-earendel-most-distant-star-ever-detected >
No. Earendel has the spectrum of a type B star and is about 1 million times brighter than the Sun, the only reason even the James Webb telescope is able to see it is because due to a lucky accident a very massive galaxy is between us and that star and has magnified it several thousand times by gravitational lensing. However Earendel may be an example of a population 3 star that astronomers have been seeking for decades; a first generation star that is composed almost entirely of hydrogen and helium and no metals. By contrast a Dark Star, if one exists, would have a spectrum closer to that of a type G star like the sun but be at least 1 billion times brighter; it would be so bright it would be hard to tell the difference between it and an entire galaxy that was so distant it was almost a point source in our telescopes. John K Clark See what's on my new list at Extropolis <https://groups.google.com/g/extropolis> lqn > > > > On Sun, 16 Jul 2023, 23:58 John Clark, <[email protected]> wrote: > >> As early as 2012 scientists predicted that the Hubble telescope would see >> something they called a "Dark Star". >> >> Observing supermassive dark stars with James Webb Space Telescope >> <https://academic.oup.com/mnras/article/422/3/2164/1043351?login=false> >> >> They theorized in the early universe Dark Matter, whatever it is, must've >> been much more densely concentrated than it is today, and if Dark Matter >> particles are their own antiparticles as many think then their annihilation >> could provide a heat source, they could keeping star in thermal and >> hydrodynamic equilibrium and prevent it from collapsing. They hypothesized >> something they called a "Dark Star '', it would be a star with a million >> times the mass of the sun and would be composed almost entirely of hydrogen >> and helium but with 0.1% Dark Matter. A Dark Star would not be dark but >> would be 10 billion times as bright as the sun and be powered by dark >> matter not nuclear fusion. >> >> Astronomers were puzzled by pictures taken with the James Webb telescope >> that they interpreted to be bright galaxies just 320 million years after >> the Big Bang that were much brighter than most expected them to be that >> early in the universe, a recent paper by the same people that theorized >> existence of Dark Stars claim they could solve this puzzle. They claim 3 >> of the most distant objects that the Webb telescope has seen are point >> sources, as you'd expect from a Dark Star, and their spectrum is consistent >> with what they predicted a Dark Star should look like. With a longer >> exposure and a more detailed spectrum, Webb should be able to tell for sure >> if it's a single Dark Star or an early galaxy made up of tens of millions >> of population 3 stars. >> >> Supermassive Dark Star candidates seen by JWST >> <https://www.pnas.org/doi/10.1073/pnas.2305762120> >> >> >> >> 3v >> > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAJPayv0e1%2B__qaAx9GAHpLQ%3DsGmrJJBXxkM1WoEd40FeCCrJtA%40mail.gmail.com.
