Science > Physics > Age of the Universe based on the age of the isotopes
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Science > Physics |
| User: |
"Sam Wormley" |
| Date: |
06 Jul 2005 04:33:33 PM |
| Object: |
Age of the Universe based on the age of the isotopes |
Ref: http://www.astro.ucla.edu/~wright/cosmolog.htm#News
New Age for the Universe
30 Jun 2005 - This week's Nature has a letter giving a new determination
of the age of the Universe based on the age of the isotopes. 238U and
232Th are both radioactive with half-lives of 4.468 and 14.05 Gyrs but
the uranium is underabundant in the Solar System compared to the expected
production ratio in supernovae. This is not surprising since the 238U has
a shorter half-life, and the magnitude of the difference gives an estimate
for the age of the Universe. But the production ratio is poorly known from
nuclear physics models, so Dauphas (2005, Nature, 435, 1203) combines the
Solar System 238U:232Th ratio with the ratio observed in very old, metal
poor stars to solve simultaneous equations for both the production ratio
and the age of the Universe, obtaining 14.5 +2.8/-2.2 Gyr.
See: http://www.astro.ucla.edu/~wright/cosmolog.htm#News
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| User: "tj Frazir" |
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| Title: Re: Age of the Universe based on the age of the isotopes |
06 Jul 2005 06:02:53 PM |
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Isotopes 14 by.
hu ?
the max distance any mass has gone is 186 million light years.
The star was seen 10 billion light years away .
The radius of the universe was 10 billion light years at the time of
the big bang.
the universe is 24 billion years old.
Or mmmm how does an object get 10 billion light years away in 14
billion years at .013*c
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| User: "Bjoern Feuerbacher" |
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| Title: Re: Age of the Universe based on the age of the isotopes |
07 Jul 2005 02:41:39 AM |
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tj Frazir wrote:
Isotopes 14 by.
hu ?
the max distance any mass has gone is 186 million light years.
The star was seen 10 billion light years away .
The radius of the universe was 10 billion light years at the time of
the big bang.
the universe is 24 billion years old.
Or mmmm how does an object get 10 billion light years away in 14
billion years at .013*c
Where did you get that speed from, and what makes you think it had
*always* that speed?
Bye,
Bjoern
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| User: "Morituri-|-Max" |
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| Title: Re: Age of the Universe based on the age of the isotopes |
07 Jul 2005 03:21:16 AM |
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"Bjoern Feuerbacher" <bjoern.feuerbacher@pci.uni-heidelberg.de> wrote in
message news:daimbj$e70$1@news.urz.uni-heidelberg.de...
Where did you get that speed from, and what makes you think it had
*always* that speed?
He looked it up the same place he and other super-billionaires do all their
proof-of-concept research, webTV...
8 )
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