[The Magical Mischief Tour]

They suggest that during its orbit, this red dwarf or brown dwarf star would regularly enter the Oort cloud, jostling the orbits of many comets there and causing some to fall toward Earth. That would provide an explanation for what seems to be a cycle of mass extinctions here.

Hmmmm...

[muawiyah]

Oh, yes, and once upon a time the Giant Red Dwarf kicked over the Oort Cloud pummeling Earth with comets. And all the dinosaurs died.

[piasa]

They suggest that during its orbit, this red dwarf or brown dwarf star would regularly enter the Oort cloud, jostling the orbits of many comets there and causing some to fall toward Earth

Wouldn't something four times the mass of Jupiter cause said comets to fall towards itself rather than towards a teeny little planet far, far away?

[Domestic Church]

Jostled outer or inner Oort causes mass extinctions...pythonesque!

[RebelTex]

“...this red dwarf...”

Isn’t that a space garbage scow? Oh, right, it was a mining ship that looked like a garbage scow, LOL.

Red Dwarf: The Complete Guide
http://www.reddwarf.co.uk/news/index.cfm

;>D