[ml/nj]

Having learned comets were primarily balls of ice and seeing the comet appears to be a very solid object has me questioning what is being thrown off, causing the 'tail'.

Glad to see someone else here thinks like me. (Does ice crater when impacted?)

And now "powder"? What could posssibly have brought this powder to the surface and keep it in place? The escape velocity from such a small mass must be next to nothing.

ML/NJ

[Vinnie]

I've always questioned the ice theory.
Ice sublimes in a vacuum. How can there be ice on a comet, or the Moon for that matter?
Certainly over the millions of years these objects are supposed to have existed any ice would have long ago evaporated. IMHO anyway.( that is how they make freeze dried food)