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Supernova Dust Fell to Earth in Antarctic Meteorites
Scientific American 'blogs ^ | April 24, 2013 | John Matson

Posted on 04/28/2013 10:19:12 AM PDT by SunkenCiv

In the new study (pdf), Pierre Haenecour of Washington University in St. Louis and his colleagues analyzed two meteorites collected in Antarctica in 2003, each named for a geographic feature near the spot where the meteorite fell. (Antarctica makes an ideal hunting ground for dark-colored meteorites, which stand out clearly against the ice fields.) Grove Mountains 021710, found by a Chinese expedition, and LaPaz Icefield 031117, collected by U.S. searchers, each harbor presolar grains of silica (SiO2), the researchers found, as evidenced by the grains’ enrichment in a heavy isotope of oxygen known as oxygen 18. That signature points to the grains’ formation in a type II supernova -- the explosion initiated by the collapse of a massive star’s core. Other researchers had spotted presolar silica in meteorites before, but those grains had different isotopic signatures that indicated that they came from an aging star called an asymptotic giant branch (AGB) star rather than from a supernova.

The conclusion by Haenecour and his colleagues that a supernova seeded our corner of space with silica grains, among other types of dust, lends laboratory support to a 2008 study, using the Spitzer Space Telescope, that spotted the possible spectral signature of silica in the remnant of a supernova that exploded in the Milky Way so recently that its light reached Earth just 300 or so years ago.


(Excerpt) Read more at blogs.scientificamerican.com ...


TOPICS: Astronomy; Science
KEYWORDS: antarctica; catastrophism; clovisimpactevent; godsgravesglyphs; pierrehaenecour; supernova
A section of the LaPaz Icefield 031117 meteorite, courtesy of NASA.

A section of the LaPaz Icefield 031117 meteorite, courtesy of NASA.

1 posted on 04/28/2013 10:19:12 AM PDT by SunkenCiv
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The Cycle of Cosmic Catastrophes: Flood, Fire, and Famine in the History of Civilization The Cycle of Cosmic Catastrophes:
Flood, Fire, and Famine
in the History of Civilization

by Richard Firestone,
Allen West, and
Simon Warwick-Smith


2 posted on 04/28/2013 10:19:43 AM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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http://presolar.wustl.edu/Laboratory_for_Space_Sciences/Publications_2013_files/2013_ApJL768_L17.pdf


3 posted on 04/28/2013 10:20:03 AM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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To: 75thOVI; agrace; aimhigh; Alice in Wonderland; AndrewC; aragorn; aristotleman; Avoiding_Sulla; ...



4 posted on 04/28/2013 10:20:30 AM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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To: SunkenCiv
Supernova Dust Fell to Earth in Antarctic Meteorites

It's like beatnik poetry. Did Allen Ginsburg write this headline?

5 posted on 04/28/2013 10:23:23 AM PDT by ClearCase_guy (The ballot box is a sham. Nothing will change until after the war.)
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To: SunkenCiv

ahhh-HA!


6 posted on 04/28/2013 10:29:14 AM PDT by bigheadfred
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To: ClearCase_guy
It's like beatnik poetry.

Yes, RR Lyrae-cal...

7 posted on 04/28/2013 10:29:27 AM PDT by null and void (Republicans create the tools of oppression and Democrats use them. Gun confiscation enables tyranny.)
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To: SunkenCiv

Evidence is piling up in support of Darwin’s theory of evolution. The entire universe is evolving.


8 posted on 04/28/2013 10:32:07 AM PDT by OldNavyVet
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To: OldNavyVet

Darwin was an idiot and you have to jump to too many unknown concepts and bridge too much data to fully support in the entire history of mankind, one guy got it right.

Anyone know who that person is today? Not one.

There is a huge difference between evolution and adaption which he never addresses.

Darwin, saw a snap-shot in his life and extrapolated data he never proved or, disproved - we call that global warming in this generation.


9 posted on 04/28/2013 10:40:28 AM PDT by edcoil (If the man was accused of leadership, there would not be enough evidence to convict him.)
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To: edcoil
Fronm the internet.

The phrase "Ignorance is bliss" is from the poem Ode on A Distant Prospect of Eton College by the English poet Thomas Gray. The poem was published in 1742. The full context of the quote reads as follows:

"Thought would destroy their paradise. No more. Where ignorance is bliss, 'tis folly to be wise".

10 posted on 04/28/2013 11:02:42 AM PDT by OldNavyVet
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To: ClearCase_guy

Champagne Supernova.


11 posted on 04/28/2013 11:39:31 AM PDT by Sawdring
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To: OldNavyVet

 GGG managers are SunkenCiv, StayAt HomeMother & Ernest_at_the_Beach
Just adding to the catalog, not sending a general distribution. ;')

To all -- please ping me to other topics which are appropriate for the GGG list.


12 posted on 04/28/2013 12:28:24 PM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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To: bigheadfred

Crystal Blue Persuasion...


13 posted on 04/28/2013 12:28:43 PM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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To: ClearCase_guy; null and void

That Howl-mo?


14 posted on 04/28/2013 12:29:32 PM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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To: edcoil
Darwin was an idiot and you have to jump to too many unknown concepts and bridge too much data to fully support in the entire history of mankind, one guy got it right.

And who was that exactly, you?

Moron.

15 posted on 04/28/2013 1:11:31 PM PDT by John Valentine (Deep in the Heart of Texas)
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To: John Valentine

At least i am not an ideologue like you and free to think as you can. It appears you gave up that knowledge a long time ago and simply drank the cool-aid.


16 posted on 04/28/2013 1:41:40 PM PDT by edcoil (If the man was accused of leadership, there would not be enough evidence to convict him.)
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To: John Valentine

And before you call some one a moron for simply disagreeing with you, Darwin noted “things change” but never proved where the stuff came from to change.

Half and idea is still half and idea.


17 posted on 04/28/2013 1:43:58 PM PDT by edcoil (If the man was accused of leadership, there would not be enough evidence to convict him.)
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To: edcoil
You assume I am calling someone else a moron. You might just as well assume that was my "signoff".

By the way, I have never called anyone a moron simply for disagreeing with me. There are plenty of morons out there who agree with most of my thinking and there are plenty of very smart people who don't. And vice versa.

If I were to call someone a moron, it would be because they said something really dumb in public.

...Darwin noted “things change” but never proved where the stuff came from to change.

So what? You seem to be saying that unless an idea is perfectly complete, fully developed in all its implications and consequences, as well as fully supported in ways not even discovered yet, the idea is somehow debased. That's dumb.

Half an idea is still half an idea.

Yes - and half an idea is still better than no cogent idea at all.

18 posted on 04/28/2013 2:25:07 PM PDT by John Valentine (Deep in the Heart of Texas)
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