bmahersciwriter writes: Theoretical physicists propose that the Sun periodically crosses into a dense layer of dark matter sandwiching the Milky Way. The gravitational push and pull that this creates disturbs debris in the Oort cloud sending deadly comets and asteroids ricocheting around the solar system. This passage happens, their admittedly speculative model suggests, every 35 million years, which jibes somewhat with evidence on impact craters. Take it with a dino-sized grain of salt. Link to Original Source
"And do you think (fop that I am) that I could be the Scarlet Pumpernickel?"
-- Looney Tunes, The Scarlet Pumpernickel (1950, Chuck Jones)