[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: Galactic forces at work in mass extinctions?



--- David Marjanovic <david.marjanovic@gmx.at>
schrieb:

> > Two years ago, scientists at the University of
> California, Berkeley
> > found the marine fossil record shows that
> biodiversityâ&#8364;&#8221;the number of
> > different species alive on the
planetâ&#8364;&#8221;increases
> and decreases on a
> > 62-million-year cycle.
> 
> Wasn't it 31 last time this was proposed (in the
> 1980s)? 

Might be interesting to look whether there are Oort
Cloud, Kuiper Belt, or other outer solar system
dynamics with such a periodicity. Because for all that
is said, the K-Pg bang was ultimately a one-time
event: the impacting body was destroyed. Where it came
from and why may be another matter. Maybe every 31
million years, the number of asteroids, mega-comets or
whatchamacallits send sunwards increses dramatically,
and thus the chance of collision with these things.
Travel time from the outer reaches of the solar system
is a blink of an eye compared to the supposed cycle's
duration (< to << than 1% of the cycle's duration),

Eike


      __________________________________  Kennt man wirklich jeden über 3 
Ecken? Die Antworten gibt's bei Yahoo! Clever. www.yahoo.de/clever