wrote
In sci.astro Lisa Agnes Gardner wrote on Mon,
23 Jun 2003 19:47:15 -0700:

:LAG What do you do at the lab, BTW?

I research asteroids and comets, why?

Jim.

Lisa thinks comets are out to get her and an asteroid is some
kind of growth on her butt.

So, what would you say to the guy who said "tail drag" changes
comets' orbits "when they come into the solar system"? George
Norry said something like "Gosh, I didn't know that!" The tail,
according to that twit, consists of debris the comet attracts (its
"entourage"). I'm not making this up. He really said that, and
he wants you to buy his book. I was waiting for him to start
talking about the net momentum change when the comet
sweeps up space junk, but apparently his "tail drag" is limited
to the same atmospheric drag that screws up satellite orbits.
Apparently the comets lose their tails on the way out, probably
by magic, and it takes years to grow a new one.

I think Lisa's path might change because of tail drag.