About those big iceballs past Pluto...
What about the theory that our Sol system moving through the
Milky Way galaxy gets the comets and KBOs and TNOs (and whatever
else we call them) all stirred up, causing some of them to plunge
Solward and doing things like wiping out the dinosaurs.
Is it still a possibility, has it been outmoded, or is it still way too
soon to tell until we actually hit another interstellar hydrogen cloud
on our 225 million year journey around Galactic Center?