The First Stars

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Gord
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The First Stars

Postby Gord » Thu Mar 22, 2018 7:28 am

http://www.astronomy.com/news/2018/03/f ... irst-stars

Fingerprinting the very first stars
Using a radio antenna the size of a tabletop, astronomers found evidence suggesting the first stars formed just 180 million years after the Big Bang.

...This week in the journal Nature, after over a decade of intense experimental investigation, a team of astronomers announced that they have finally cracked the case of the first stars. Using a simple radio antenna the size of a tabletop located in the Australian desert, the researchers discovered the faint fingerprints of the earliest stars in the infant universe, which formed when the cosmos was just 180 million years old....

And also this:

https://www.youtube.com/watch?v=-R9F2_D76TE
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TJrandom
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Re: The First Stars

Postby TJrandom » Thu Mar 22, 2018 12:18 pm

They saw stars on Hollywood blvd. from the Australian desert? :?

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Gawdzilla Sama
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Re: The First Stars

Postby Gawdzilla Sama » Thu Mar 22, 2018 12:26 pm

More like "These are the earliest stars yet detected."
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Re: The First Stars

Postby Matthew Ellard » Thu Mar 22, 2018 9:42 pm

OK. I sort of understand what the video is saying.

Hydrogen was colder than it should be, back then, and one hypothesis is that early hydrogen somehow interacted with dark matter, although dark matter isn't meant to interact with anything.

Thanks Gord..... for adding another problem to astrophysics. You bastard.
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Re: The First Stars

Postby OlegTheBatty » Fri Mar 23, 2018 10:48 pm

A more scientific take on it.

Dark matter is only one possible explanation, though there is nothing in the data that would exclude it. The biggest complaint would be the necessity of a mediating particle, and particle physics data places severe constraints on the characteristics of such a particle. Not impossible, but.

Includes a short bit discussing whether they actually measured what they think they measured (in the comments section)
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Gord
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Re: The First Stars

Postby Gord » Sat Mar 24, 2018 8:26 am

Gawdzilla Sama wrote:More like "These are the earliest stars yet detected."

No, it's referring to the first stars in the universe. There couldn't be any before that. They're the "first generation stars", also called the "population III stars" (because the people who named the populations didn't know which generation was which). They're made of hydrogen and helium, because nothing else had been created in large amounts before then. The first generation stars created heavier elements in their cores, then exploded and scattered those elements. Second generation stars formed from the gases containing those heavier element, so they had some of them affecting their spectra. Then the second generation stars created more in their cores, exploded, and scattered even more of them into the universe. Now we have third generation stars, that have lots of those elements in them. The Sun is one of those third generation stars, and that's why the planets in our solar system contain so many of the heavier elements, like carbon and oxygen and gold and Nike sneakers.
"Knowledge grows through infinite timelessness" -- the random fictional Deepak Chopra quote site
"Imagine an ennobling of what could be" -- the New Age BS Generator site
"You are also taking my words out of context." -- Justin
"Nullius in verba" -- The Royal Society ["take nobody's word for it"]
#ANDAMOVIE


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