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Explosions In Space May Have Initiated Ancient Extinction On Earth
Science Daily ^
| 4/12/05
| NASA/Goddard Space Flight Center
Posted on 04/12/2005 1:12:15 PM PDT by doc30
click here to read article
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To: doc30
Thanks for the ping. Good article. I fear the thread's gone downhill already, but I'll crank up the ping machine.
21
posted on
04/12/2005 3:01:33 PM PDT
by
PatrickHenry
(<-- Click on my name. The List-O-Links for evolution threads is at my freeper homepage.)
To: VadeRetro; Junior; longshadow; RadioAstronomer; Doctor Stochastic; js1138; Shryke; RightWhale; ...
Science Ping! |
An elite subset of the Evolution list. |
See list's description in my freeper homepage. Then FReepmail to be added/dropped. |
|
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22
posted on
04/12/2005 3:02:40 PM PDT
by
PatrickHenry
(<-- Click on my name. The List-O-Links for evolution threads is at my freeper homepage.)
To: RightWhale; Brett66; xrp; gdc314; sionnsar; anymouse; RadioAstronomer; NonZeroSum; jimkress; ...
23
posted on
04/12/2005 3:04:21 PM PDT
by
KevinDavis
(Let the meek inherit the Earth, the rest of us will explore the stars!)
To: doc30
[ Explosions In Space May Have Initiated Ancient Extinction On Earth ]
And since we're IF'n....
Maybe they DIDN"T...
24
posted on
04/12/2005 3:04:42 PM PDT
by
hosepipe
(This Propaganda has been edited to include not a small amount of Hyperbole..)
To: doc30
Literally:
25
posted on
04/12/2005 3:05:25 PM PDT
by
freedumb2003
(First you get the sugar, then you get the power, then you get the women (HJ Simpson))
To: Ashamed Canadian
"...and they berate us Christians for not having direct evidence. I suppose this will be adopted as scientific fact shortly then."
Sooooo. Mein lieber Herr....
Ver did you get zees hatred for Science, huh.
Never fear, ve haf our ways to make you talk...
O-\
O-/
26
posted on
04/12/2005 3:24:44 PM PDT
by
furball4paws
(Ho, Ho, Beri, Beri and Balls!)
To: PatrickHenry
A strange article IMHO. First of all, modelling of supernova extinction has been conducted as far back as
1995 - there's nothing novel about the idea anymore. Secondly, at least since
1999 the
hard evidence has been building that in fact several extinction events are attributable to cosmic rays - it's not just a "what-if" scenario..
27
posted on
04/12/2005 3:39:58 PM PDT
by
AntiGuv
(™)
To: AntiGuv
A strange article ... I'm just the ping list guy.
28
posted on
04/12/2005 3:42:12 PM PDT
by
PatrickHenry
(<-- Click on my name. The List-O-Links for evolution threads is at my freeper homepage.)
To: doc30
Ok.
Here's a stupid questions:
How do these scientists know that we in fact HAD an ozone layer way back when?
29
posted on
04/12/2005 3:42:55 PM PDT
by
roaddog727
(The marginal propensity to save is 1 minus the marginal propensity to consume.)
To: roaddog727
How do these scientists know that we in fact HAD an ozone layer way back when? Because ozone is produced whenever an oxygen molecule O2 is split by ultraviolet waves from the sun and the stray oxygen atoms then attach to another O2 oxygen molecule, creating an O3 molecule - ozone. The electrical discharge of lightning also produces ozone and we know both phenomena (sunlight & lightning + oxygen) have been around since way back when.
The ozone has a very short half-life (less than five days) so it has to be continually recycled, so that's how we also know that the current ozone layer isn't just an accumulation over the eons. Finally, ozone is vitally important to complex life as we know it, because the UV rays would cause irreparable damage otherwise. Since there was complex life, there must've been an ozone layer.
30
posted on
04/12/2005 4:06:13 PM PDT
by
AntiGuv
(™)
To: doc30
Were the explosions near Uranus?
31
posted on
04/12/2005 4:08:33 PM PDT
by
dfwgator
(Minutemen: Just doing the jobs that American politicians won't do.)
To: dfwgator
A gamma-ray burst originating within 6,000 light years from Earth...T1--explosion. T2--6,000+ years later--Earth gets the blast.
Whatever we're afraid of, it's already happened.
32
posted on
04/12/2005 6:06:34 PM PDT
by
Rudder
To: dfwgator
33
posted on
04/12/2005 6:13:04 PM PDT
by
reg45
To: doc30
34
posted on
04/12/2005 6:15:33 PM PDT
by
LiteKeeper
(The radical secularization of America is happening)
To: PatrickHenry
To: PatrickHenry
... I fear the thread's gone downhill already, That's OK. I get much entertainment from reading the comments from non-scientists and anti-scientists post. It is quite humorous and lets me know I have job security :)
36
posted on
04/13/2005 6:03:31 AM PDT
by
doc30
(Democrats are to morals what and Etch-A-Sketch is to Art.)
To: AntiGuv
Your refrences are very interesting. I wonder if anyone has tried to map the Fe60 distribution. Since a gamma ray burst would, in principle last only for a few moments, a map of the distribution of the altered isotopes would reveal which hemisphere was affected and what direction the burst came from. Too bad stellar drift would make that information pointless.
37
posted on
04/13/2005 6:08:23 AM PDT
by
doc30
(Democrats are to morals what and Etch-A-Sketch is to Art.)
To: doc30
This topic is from April 2005.
39
posted on
08/08/2006 9:42:15 AM PDT
by
SunkenCiv
(updated my FR profile on Thursday, July 27, 2006. https://secure.freerepublic.com/donate/)
This topic was posted , thanks again doc30.
The rest of the gammarayburst keyword:
40
posted on
10/18/2022 6:01:27 PM PDT
by
SunkenCiv
(Imagine an imaginary menagerie manager imagining managing an imaginary menagerie.)
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