On Sat, Aug 12, 2023 at 11:40 PM LizR <lizj...@gmail.com> 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, <johnkcl...@gmail.com> 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 everything-list+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAJPayv0e1%2B__qaAx9GAHpLQ%3DsGmrJJBXxkM1WoEd40FeCCrJtA%40mail.gmail.com.
