False color image of Cassiopeia A using Hubble and Spitzer telescopes and Chandra X-ray Observatory.
I guess there are things that could be worse than a Hillary presidency.
Posted on 04/06/2016 3:50:53 PM PDT by JimSEA
An international team of scientists has found evidence of a series of massive supernova explosions near our solar system, which showered Earth with radioactive debris.
The scientists found radioactive iron-60 in sediment and crust samples taken from the Pacific, Atlantic and Indian Oceans.
The iron-60 was concentrated in a period between 3.2 and 1.7 million years ago, which is relatively recent in astronomical terms, said research leader Dr Anton Wallner from The Australian National University (ANU).
"We were very surprised that there was debris clearly spread across 1.5 million years," said Dr Wallner, a nuclear physicist in the ANU Research School of Physics and Engineering. "It suggests there were a series of supernovae, one after another.
"It's an interesting coincidence that they correspond with when the Earth cooled and moved from the Pliocene into the Pleistocene period."
The team from Australia, the University of Vienna in Austria, Hebrew University in Israel, Shimizu Corporation and University of Tokyo, Nihon University and University of Tsukuba in Japan, Senckenberg Collections of Natural History Dresden and Helmholtz-Zentrum Dresden-Rossendorf (HZDR) in Germany, also found evidence of iron-60 from an older supernova around eight million years ago, coinciding with global faunal changes in the late Miocene.
(Excerpt) Read more at sciencedaily.com ...
False color image of Cassiopeia A using Hubble and Spitzer telescopes and Chandra X-ray Observatory.
I guess there are things that could be worse than a Hillary presidency.
>>Supernovae showered Earth with radioactive debris<<
Womyn and minorities hardest hit!
Will the Government have to raise taxes ?
If I wanted the Earth to be showered with radioactive debris I would remove all sanctions from Iran and give them billions of dollars... Whoops, too late. Someone already did that.
>>Will the Government have to raise taxes ?<<
Space radiation credits.
The Alpha Centauri system is 4.37 Light Years away.
So if one of it’s stars went nova we wouldn’t know about it for 4.37 years.
How much time is there between seeing the explosion and it’s physical effects on our system?
Just curious.
‘...the Pliocene into the Pleistocene period.’
Those Were The Days! ;)
How much iron-60 hit the earth if we can still find measureable amounts after 1.5 million years?
Much slower than the speed of light (seeing it) obviously. The answer is in here, “One of these isotopes is iron-60 which decays with a half-life of 2.6 million years, unlike its stable cousin iron-56.” It would have to have been a relatively close star but with the isotope being created in the supernova and knowing, as they must, the age of the strata the isotope is found in, they can have a fair idea of the star’s distance and from that you could calculate the speed.
Opps,it’s half life is 2.6 million years!
You can get a age well beyond the isotope’s half life of 2.6 million years.
What?? But it's only the evil United States and it's evil nuclear weapons and nuclear power programs that spreads the awful radioactive stuff around the globe and causes the birth of two headed kittens.
Forget it, that’s well before GW Bush and before Reagan even. Nobody to blame. Sad, really.
Aw hell, that’s Tuesday down here in Texas.
Sheesh, a little radioactivity and everybody starts getting all uppity.
Ummm.
Maybe not if it's subject to a vote...
Silly question.
It's obviously the result of global warming.
Tax it!
And this is what they call science nowadays? Let’s just make up a theory knowing that it can’t be proven?
I don’t know. You’ve got some isotopes that don’t exist normally on earth. They are however a product of supernovas. They didn’t come from here. It’s not a big leap to the reasoning of this study. Proven? Yes to a good degree of certainty. It is however, like all hypothesis, subject to challenges and is not “settled science” but has a reasonable degree of probability. I don’t know much in science that isn’t open to challenges.
But of course. That’s the knee jerk response to most things.
"Ceterum censeo 0bama esse delendam."
Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)
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