Larouche's idea that the solar systems bobs up and down through the arms of the galaxy remains unexplained.

The bobbing solar system is a rediculous idea. [Picture from www.tetrahedral.blogspot.com

Larouche wrote

QUOTE
Long term temperature changes are mapped by the change in O-18, O-16 and Be-10 in deep ocean fossil cores over time. Recent work by Dr. Shaviv and others, have correlated these changes with the flux of cosmic ray density, and there appears to be a 145 million year cycle of ice ages which corresponds with the passing of our solar system through the galaxy’s spiral arms.3
UNQUOTE
source http://www.larouchepac.com/node/19290

MY COMMENT
Witzsche notes this can't be. He asks why would our solar system be the only one to be bobbing? He's got a point that I haven't seen Larouche or sky Shields answer. And none of the Larouche articles expands on this. Larouche cites a source as 3The Milky Way Galaxy's Spiral Arms and Ice-Age Epochs and the Cosmic Ray Connection, by By Nir J. Shaviv.

CONT'D... plus dicussion...