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Posted
no, not particularly. But what's so special about 62 million years?
No one knows for sure, but it appears the earth gets bombarded by asteroids or comets about ever 62-65 million years. It could be that our sun has an unseen and distant companion (brown dwarf) star that periodically dislodges massive comets from the Oort Cloud. There is no agreement among scientists that I know of.

 

Others think it is volcanic activity on a huge scale, but why should volcanic activity be so regular?

Posted
Thursday
Just about, give or take a million years. We are actually past due for another extinction event. It will be interesting to see whether we exterminate ourselves before the next asterioid hits.
Posted
It could be that our sun has an unseen and distant companion (brown dwarf) star that periodically dislodges massive comets from the Oort Cloud.

I have a rarely seen and distant companion brown star too, and it also periodically dilodges massive things, usually preceded by Oort clouds! hahaha.gifmoon.gif

Posted
no, not particularly. But what's so special about 62 million years?
No one knows for sure, but it appears the earth gets bombarded by asteroids or comets about ever 62-65 million years. It could be that our sun has an unseen and distant companion (brown dwarf) star that periodically dislodges massive comets from the Oort Cloud. There is no agreement among scientists that I know of.

 

Others think it is volcanic activity on a huge scale, but why should volcanic activity be so regular?

 

Maybe a burst of solar radiation or some sort of gamma bombardment that periodically eminates from the theoretical super black hole at the center of our galaxy? Would such a gamma burst be readable in the geologic record here?

Posted
some sort of gamma bombardment

 

"the chief brigadier's head began to swell

firing off depleted uranium shells

he bombarded everything pretty well

except for the gamma ray

 

and the gamma ray seemed to say

if you carry twelve margaritas on a tray

you cannot be touched in any way

by the benign yet malevolent ...

 

gamma-gamma-gamma-gamma

gamma-gamma-gamma-gamma ray"

 

- Joe Strummer & the Mescaleros, "Gamma Ray"

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