2 ms·
Another theory for the periodicity of the extinctions has to do with crossing the galactic plane: http://www.americanscientist.org/issues/pub/perturbing-the-oor
by slackerIII 17y ago
Another theory for the periodicity of the extinctions has to do with crossing the galactic plane: http://www.americanscientist.org/issues/pub/perturbing-the-oort-cloud http://www.americanscientist.org/issues/pub/perturbing-the-o...