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  Topic: Cosmology and Biodiversity, An interesting intersection hypothesis< Next Oldest | Next Newest >  
Lou FCD



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(Permalink) Posted: June 12 2007,14:56   

Older story I missed, also via LiveScience

Quote
The rise and fall of species on Earth might be driven in part by the undulating motions of our solar system as it travels through the disk of the Milky Way, scientists say.

Two years ago, scientists at the University of California, Berkeley found the marine fossil record shows that biodiversity—the number of different species alive on the planet—increases and decreases on a 62-million-year cycle. At least two of the Earth’s great mass extinctions—the Permian extinction 250 million years ago and the Ordovician extinction about 450 million years ago—correspond with peaks of this cycle, which can’t be explained by evolutionary theory.

Now, a team of researchers at the University of Kansas (KU) have come up with an out-of-this-world explanation. Their idea hinges upon the fact that, appearances aside, stars are not fixed in space. They move around, sometimes rushing headlong through galaxies, or approaching close enough to one another for brief cosmic trysts.

In particular, our Sun moves toward and away from the Milky Way’s center, and also up and down through the galactic plane. One complete up-and-down cycle takes 64 million years— suspiciously similar to Earth’s biodiversity cycle.


Probably should read the rest of the blurb at the link above to get the full gist of it.  I didn't want to paste too much of it...

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Lou FCD is still in school, so we should only count him as a baby biologist. -carlsonjok -deprecated
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Henry J



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(Permalink) Posted: June 12 2007,21:40   

Get those shields up! Bad space weather ahead!

Henry

  
Ichthyic



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(Permalink) Posted: June 12 2007,22:23   

might try matching it up with the frequency of super-volcanic eruptions as well.

Yellowstone suggests periodicity with which it erupts, for example.

if a couple of supervolcanoes went off fairly close together, that would throw a monkey wrench in things.

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"And the sea will grant each man new hope..."

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Darth Robo



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(Permalink) Posted: June 13 2007,06:41   

Heard of this before.  As the sun wobbles through the galaxy like a drunk, asteroids may also be disturbed and get thrown our way.  (I think it was on that Sam Neill 'Space' documentary.)

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Lou FCD



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(Permalink) Posted: June 13 2007,08:03   

Quote (Darth Robo @ June 13 2007,06:41)
Heard of this before.  As the sun wobbles through the galaxy like a drunk, asteroids may also be disturbed and get thrown our way.  (I think it was on that Sam Neill 'Space' documentary.)

I rather enjoyed that documentary.  We live in an effin shooting gallery, that's for sure.

Now add the motion of our galactic orbit which takes us closer to the bow shock every 64 million years where we're less protected from the extra-galactic cosmic rays as presented by these guys.

There sure is a lot of stuff out there trying to kill us.

Oh, and Ichthyic's super volcanoes.

...and comets from the Kuiper Belt and the Oort Cloud.

...and NEOs that we haven't discovered yet.

...and CME's that our own sun keeps spitting at us.  Traitor bitch.  I bet she thinks that's funny.

...and we can't forget supernovas and gamma ray bursts that could fry the atmosphere clean off if they occur too close.  (**casts a suspicious eye around our stellar neighborhood**)

...and the big honkin' "oh I think I'll eat a few million stars today" black hole at the center of the galaxy.  I don't care what they say, I don't trust that guy.  He's kinda shady lookin'.  (or shady not-lookin', I suppose)

...and the Andromeda galaxy which wants us to stop by and say hello, up close and personal.  I tried to turn that invitation down once, but that place has a certain pull to it...

...and psycho humans with WMDs - like Dubya fer instance.

...oh, and sharks.  Ichthyic assures me that they mostly have no interest in eating me, but I'm in denial on that one.  :)

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Lou FCD is still in school, so we should only count him as a baby biologist. -carlsonjok -deprecated
I think I might love you. Don't tell Deadman -Wolfhound

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Darth Robo



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(Permalink) Posted: June 13 2007,08:36   

"I rather enjoyed that documentary."

So did I.  I thought it was quite funny that in nearly every episode, he was like "And if (such and such) happens, we're all gonna DIE."

:D

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Lou FCD



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(Permalink) Posted: June 13 2007,10:34   

It was more like "when this happens..."

There was one on the other night (I had stuff I had to attend to and missed the middle part, damnit) that was like The Top Ten Threats To Life On Earth or something.  Similar premise, and also well done, from what I saw.

Neil deGrasse Tyson was on it a couple of times.

I love that guy.

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Lou FCD is still in school, so we should only count him as a baby biologist. -carlsonjok -deprecated
I think I might love you. Don't tell Deadman -Wolfhound

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SpaghettiSawUs



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(Permalink) Posted: June 13 2007,13:12   

So you mean teh fludski could have corresponded with the peak of the current wobble (we're still just about in one aren't we if my math is right... gullllp)....

Maybe the milky way is really god's toy yoyo...

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On June 23, 2007, 01:06 PM AFDave wrote: "How can we dismiss their theories without first reading their work?"

  
Ichthyic



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(Permalink) Posted: June 13 2007,13:53   

Quote

...oh, and sharks.  Ichthyic assures me that they mostly have no interest in eating me, but I'm in denial on that one.


oh, did I forget to mention the giant, planet-eating space sharks?

I did, didn't I.

oops.

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"And the sea will grant each man new hope..."

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Ichthyic



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(Permalink) Posted: June 13 2007,13:53   

Quote (Darth Robo @ June 13 2007,08:36)
"I rather enjoyed that documentary."

So did I.  I thought it was quite funny that in nearly every episode, he was like "And if (such and such) happens, we're all gonna DIE."

:D

Yousa peoples gonna die?

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"And the sea will grant each man new hope..."

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Lou FCD



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(Permalink) Posted: June 13 2007,14:21   

Quote (Ichthyic @ June 13 2007,13:53)
Quote

...oh, and sharks.  Ichthyic assures me that they mostly have no interest in eating me, but I'm in denial on that one.


oh, did I forget to mention the giant, planet-eating space sharks?

I did, didn't I.

oops.

Crap.  Just when I thought it was safe to go back in the vacuum...

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Lou FCD is still in school, so we should only count him as a baby biologist. -carlsonjok -deprecated
I think I might love you. Don't tell Deadman -Wolfhound

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Lou FCD



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(Permalink) Posted: June 13 2007,14:22   

Quote (Ichthyic @ June 13 2007,13:53)
Quote (Darth Robo @ June 13 2007,08:36)
"I rather enjoyed that documentary."

So did I.  I thought it was quite funny that in nearly every episode, he was like "And if (such and such) happens, we're all gonna DIE."

:D

Yousa peoples gonna die?

We am if we don't get off this frickin' rock soon...

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Lou FCD is still in school, so we should only count him as a baby biologist. -carlsonjok -deprecated
I think I might love you. Don't tell Deadman -Wolfhound

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snoeman



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(Permalink) Posted: June 14 2007,00:19   

Quote (Ichthyic @ June 13 2007,13:53)
Quote

...oh, and sharks.  Ichthyic assures me that they mostly have no interest in eating me, but I'm in denial on that one.


oh, did I forget to mention the giant, planet-eating space sharks?

I did, didn't I.

oops.

Are space sharks descended from these?

  
Ichthyic



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(Permalink) Posted: June 14 2007,01:11   

actually, space sharks seeded both land and sea sharks on this planet.

so, you might say the reverse is more accurate, in a way.

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Darth Robo



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(Permalink) Posted: June 14 2007,07:01   

"oh, did I forget to mention the giant, planet-eating space sharks?"

Never heard of them.  Have heard of the amoeba's, though.  

http://upload.wikimedia.org/wikipedia/en/e/e6/STImmunity.jpg

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"Commentary: How would you like to be the wholly-owned servant to an organic meatbag? It's demeaning! If, uh, you weren't one yourself, I mean..."

  
Ichthyic



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(Permalink) Posted: June 14 2007,12:38   

Quote
Never heard of them.


oh yeah, you're right, I shouldn't be talking about them...

shhhhhh.

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"And the sea will grant each man new hope..."

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