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Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: Carnos Jax
Date: September 10, 2019 11:05AM
[news.slashdot.org]

Quote

Drilling into the seafloor off Mexico, scientists have extracted a unique geologic record of the single worst day in the history of life on Earth, when a city-sized asteroid smashed into the planet 65 million years ago, wiping out the dinosaurs and three-quarters of all other life. Their analysis of these new rock samples from the Chicxulub crater, made public Monday, reveals a parfait of debris deposited in layers almost minute-by-minute at the heart of the impact during the first day of a global catastrophe (Warning: source paywalled; alternative source). It records traces of the explosive melting, massive earthquakes, tsunamis, landslides and wildfires as the immense asteroid blasted a hole 100 miles wide and 12 miles deep, the scientists said. The sediments also offer chemical evidence that the cataclysm blew hundreds of billions of tons of sulfur from pulverized ocean rock into the atmosphere, triggering a global winter in which temperatures world-wide dropped by as much as 30 degrees Fahrenheit for decades, the scientists said.
"The asteroid blasted a cavity between 25 and 30 miles deep in the first seconds of impact, creating a boiling cauldron of molten rocks and super-heated steam," reports The Wall Street Journal, citing the scientists' interpretation of the rock. "Rebounding from the hammer blow, a plume of molten rock splashed up into a peak higher than Mount Everest. Within minutes, it collapsed into itself, splashing gigantic waves of lava outward that solidified into a ring of high peaks, the scientists said."

"About 20 minutes or so later, sea water surged back over the newly formed peaks, covering them in a blanket of impact rocks, the scientists said. As minutes became hours, waves choked with shards of volcanic glass and splintered rock rippled back and forth, coating the peaks in a layer of impact rock called suevite, the scientists said. As the hours passed, the backwash of waves added more and more finely graded debris. At the very top of the rock core, the scientists detected traces of organic matter and charcoal."

The study was published today in the journal PNAS.
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: Carnos Jax
Date: September 10, 2019 11:06AM
What a bad day that was.
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: mikebw
Date: September 10, 2019 11:16AM
And this, I think, is why Musk is so hot to get at least some of us on Mars, ASAP.
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: Mike Sellers
Date: September 10, 2019 11:32AM
Quote

... 65 million years ago..."

Probably a Monday.
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: NewtonMP2100
Date: September 10, 2019 11:33AM
......'roid.....rage.....??



_____________________________________

I reject your reality and substitute my own!
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: ztirffritz
Date: September 10, 2019 11:35AM
Quote
mikebw
And this, I think, is why Musk is so hot to get at least some of us on Mars, ASAP.

We need to remember that humans will not be able to live on any other planet unsupported by Earth for a LONG time. Elon's plan is ambitious, but achievable, but it still requires an umbilical cord for supplies from earth and will for decades, if not centuries.



**************************************
MacResource User Map: [www.zeemaps.com]#
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: tuqqer
Date: September 10, 2019 11:39AM
I spilled my coffee this morning, and I thought I had problems.



Mac Pro 2013 3.7GHz Quad-Core, 32G RAM Mojave 10.14.x Dual 25" Acer 1440p LCDs11" i5 MacBook Air
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: sekker
Date: September 10, 2019 12:14PM
And yet, without this massive reshuffling of life on Earth, there would be no large mammals like us.

Thanks, Mr Asteroid!

EDIT- yes, a guy. Move reasons why to the other side!



Edited 1 time(s). Last edit at 09/10/2019 12:15PM by sekker.
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: rgG
Date: September 10, 2019 12:26PM
If it happens again, I want to be at ground zero. Get it over with. Can’t imagine how awful it would be.





Roswell, GA (Atlanta suburb)
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: mikebw
Date: September 10, 2019 02:07PM
sick burn
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: Buck
Date: September 10, 2019 03:09PM
I thought they died due to lactose intolerance?!?
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: Carnos Jax
Date: September 10, 2019 03:49PM
No sufficient quantities of lactose around at the time.
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: tuqqer
Date: September 10, 2019 03:49PM
Quote
Carnos Jax
No sufficient quantities of lactose around at the time.

Thus: death.



Mac Pro 2013 3.7GHz Quad-Core, 32G RAM Mojave 10.14.x Dual 25" Acer 1440p LCDs11" i5 MacBook Air
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: Carnos Jax
Date: September 10, 2019 03:53PM
Quote
ztirffritz
Quote
mikebw
And this, I think, is why Musk is so hot to get at least some of us on Mars, ASAP.

We need to remember that humans will not be able to live on any other planet unsupported by Earth for a LONG time. Elon's plan is ambitious, but achievable, but it still requires an umbilical cord for supplies from earth and will for decades, if not centuries.

One nice byproduct of the space based infrastructure that will be required to achieve this, is that we’ll be better positioned to deal with asteroids.
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: Carnos Jax
Date: September 10, 2019 03:55PM
Quote
tuqqer
Quote
Carnos Jax
No sufficient quantities of lactose around at the time.

Thus: death.

But then that would be lactose deficiency (as opposed to intolerance). winking smiley
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: Paul F.
Date: September 10, 2019 05:22PM
Quote
ztirffritz
Quote
mikebw
And this, I think, is why Musk is so hot to get at least some of us on Mars, ASAP.

We need to remember that humans will not be able to live on any other planet unsupported by Earth for a LONG time. Elon's plan is ambitious, but achievable, but it still requires an umbilical cord for supplies from earth and will for decades, if not centuries.

I figure it'll be close to 100 years from first landing before any colony is moderately self sustaining. 200 years after that that it's completely self sustaining.

But, that's no reason not to get started! That 100 year clock doesn't get shorter if we wait around in low earth orbit with our thumbs on the dark side of uranus.
I'd really like to live to see the first human land on Mars (on a return ticket, that is).



Paul F.
-----
A sword never kills anybody; it is a tool in the killer's hand. - Lucius Annaeus Seneca c. 5 BC - 65 AD
----
Good is the enemy of Excellent. Talent is not necessary for Excellence.
Persistence is necessary for Excellence. And Persistence is a Decision.

--

--

--
Eureka, CA
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: Lux Interior
Date: September 10, 2019 07:00PM
Quote
Mike Sellers
Quote

... 65 million years ago..."

Probably a Monday.

Or a Thursday.

I could never get the hang of Thursdays.
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Re: Scientists discover new evidence about asteroid that was instrumental in killing off dinosaurs
Posted by: N-OS X-tasy!
Date: September 10, 2019 09:37PM
Quote
Lux Interior
Quote
Mike Sellers
Quote

... 65 million years ago..."

Probably a Monday.

Or a Thursday.

I could never get the hang of Thursdays.

Or a Friday... the thirteenth...



It is what it is.
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