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Re: Cometary Shower NOW?
- To: meteorite-list@meteoritecentral.com
- Subject: Re: Cometary Shower NOW?
- From: Phil@ticetboo.demon.co.uk (Phil Bagnall)
- Date: Sun, 29 Mar 1998 11:36:35 GMT
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- Reply-To: Phil@ticetboo.demon.co.uk
- Resent-Date: Mon, 30 Mar 1998 08:16:52 -0500 (EST)
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In your message dated Saturday 28, March 1998 you wrote :
> Hello Victor,
>
> It's interesting that this ties in with Ramphino's thought about a 30 million
> year extenuation cycle believed to be triggered (or helped along) by the solar
> system passing through the galactic lens and perturbing the orbits of cometary
> bodies in the Oort cloud into the inner solar system. We passed through the
> lens a few million years ago and could be seeing increased activity as a
> result.
I think this "Galactic Cycle" has largely been disproven. See, for example,
W.M.Napier's "Terrestrial Catastrophism and Galactic Cycles" in S.V.M.Clube
(Ed.) "Catastrophies and Evolution: Astronomical Foundations", Cambridge
University Press (1989) or S.Perlmutter et al "A Search for Nemesis: Current
Status and Review of Theory" in V.I.Sharpton and P.D.Ward (Eds.) "Global
Catastrophies in Earth History", Geological Society of America Special Paper 247
(1990)
--
Phil Bagnall
http://www.ticetboo.demon.co.uk/