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05-14-2023, 05:12 AM | #45 |
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Never would have contemplated discussing the Big Bang on a BMW forum, but the world has changed. The JWST didn’t disprove the Big Bang, the question it raised was how could some of the massive “structures” seen in the images have formed so early. Personally, I believe that is just a gap in our current theory, but there is so much more that “proves” the singularity, than this one question of the size of some clumps of matter.
Perhaps, for me, the most tangible proof point is the ratio(s) of early element creation that still are still constant today. One of the most interesting processes in nucleosynthesis for the BB was the “deuterium bottleneck”…basically, hydrogen formed first, but because the environment was so hot (energetic), as deuterium tried to form, it was quickly annihilated by high energy protons…so it delayed all other building block elements from forming. This fixed the ratios of particles and elements that exist today. From WIKI……As the universe expands, it cools. Free neutrons are less stable than helium nuclei, and the protons and neutrons have a strong tendency to form helium-4. However, forming helium-4 requires the intermediate step of forming deuterium. Before nucleosynthesis began, the temperature was high enough for many photons to have energy greater than the binding energy of deuterium; therefore any deuterium that was formed was immediately destroyed (a situation known as the "deuterium bottleneck"). Hence, the formation of helium-4 is delayed until the universe became cool enough for deuterium to survive (at about T = 0.1 MeV); after which there was a sudden burst of element formation. However, very shortly thereafter, around twenty minutes after the Big Bang, the temperature and density became too low for any significant fusion to occur. At this point, the elemental abundances were nearly fixed, and the only changes were the result of the radioactive decay of the two major unstable products of BBN, tritium and beryllium-7. |
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05-14-2023, 07:31 AM | #46 | |
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![]() Thanks for that post, fascinating info. So much detail ![]() |
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06-01-2023, 12:46 PM | #48 |
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In the news today:
The jellyfish galaxy JW39 hangs serenely in this image from the NASA/ESA Hubble Space Telescope. This galaxy lies over 900 million light-years away in the constellation Coma Berenices and is one of several jellyfish galaxies Hubble has been studying over the past two years. (Image credit: ESA/Hubble & NASA, M. Gullieuszik and the GASP team) |
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06-01-2023, 01:24 PM | #49 |
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900 million light years away means it's probably all whirled itself into oblivion, if you could somehow "visit" the location.
And that's amazing in itself. That light has traveled in a straight (mostly) line for 900 million years, just so we cold look at it and wonder.
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09-23-2023, 06:43 AM | #50 |
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Sombrero Galaxy -- James Webb Space Telescope mosaic taken August 25, 2023.
(cross-post)
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09-23-2023, 09:14 AM | #51 | |
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09-24-2023, 03:46 AM | #52 |
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A beautiful image from the Hubble telescope: Saturn with aurora.
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09-24-2023, 03:48 AM | #53 |
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And another good shot of a (mini) planet: Pluto. Source uncredited.
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09-24-2023, 03:56 PM | #54 | |
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The richest one percent of this country owns half our country's wealth, five trillion dollars. One third of that comes from hard work, two thirds comes from inheritance, interest on interest accumulating to widows and idiot sons and what I do, stock and real estate speculation...It's bullsh*t. I create nothing. I own. We make the rules, pal...Now you're not naive enough to think we're living in a democracy, are you buddy?
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09-25-2023, 05:10 PM | #55 |
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Good for you! You can live your life, but realize there are others around you. It's an unfortunately unique perspective.
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09-25-2023, 05:46 PM | #56 |
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Wdym?
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The richest one percent of this country owns half our country's wealth, five trillion dollars. One third of that comes from hard work, two thirds comes from inheritance, interest on interest accumulating to widows and idiot sons and what I do, stock and real estate speculation...It's bullsh*t. I create nothing. I own. We make the rules, pal...Now you're not naive enough to think we're living in a democracy, are you buddy?
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09-25-2023, 05:48 PM | #57 |
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SO dang many peeps think they, and they alone, are the center of the universe
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09-25-2023, 06:06 PM | #58 |
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Hmmm, I suspect you thought that. Anyway, I didn't say that I'm the only one in existence....read again.
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The richest one percent of this country owns half our country's wealth, five trillion dollars. One third of that comes from hard work, two thirds comes from inheritance, interest on interest accumulating to widows and idiot sons and what I do, stock and real estate speculation...It's bullsh*t. I create nothing. I own. We make the rules, pal...Now you're not naive enough to think we're living in a democracy, are you buddy?
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09-25-2023, 06:35 PM | #59 | |
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09-25-2023, 07:29 PM | #60 |
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EXACTLY, you didn’t say that. Which means you are aware of others -it was a compliment to your character
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09-25-2023, 08:03 PM | #61 | |
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![]() Anyway, tx, I guess. ![]()
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The richest one percent of this country owns half our country's wealth, five trillion dollars. One third of that comes from hard work, two thirds comes from inheritance, interest on interest accumulating to widows and idiot sons and what I do, stock and real estate speculation...It's bullsh*t. I create nothing. I own. We make the rules, pal...Now you're not naive enough to think we're living in a democracy, are you buddy?
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09-26-2023, 05:24 AM | #62 |
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The universe is apparently complicated, too.
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09-26-2023, 09:03 AM | #63 |
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Only when it doesn't follow MY directions
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09-27-2023, 03:45 AM | #64 |
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Comet Nishimura 2023
It last swung by in 1588 and will be back in another 435 years.
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09-27-2023, 04:36 AM | #65 |
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NGC6302 the Butterfly Nebula - 2009 Hubble image
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09-27-2023, 08:10 PM | #66 |
Cailín gan eagla.
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When you think about it, if aliens located 65 million light years away were to look at the earth through a powerful telescope, they would see dinosaurs.
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