"palsing" wrote in message
...

On Sunday, December 10, 2017 at 12:44:21 PM UTC-8, Hägar wrote:

*** you are one clueless dummy, treBert. By the time comets are
visible to the naked eye, they have two tails.
One trails in the direction of travel and the other is blown in the
direction of the Solar Wind, pointing away from the Sun.

Not exactly correct. 2 tails, yes, but neither one trails in the direction
of travel, unless I am not understanding what you mean by this. Both tails
point away from the Sun, but the dust trail curves and the gas (ion) tail
does not...

http://astronomy.swin.edu.au/cosmos/...tary+Dust+Tail

http://hubblesite.org/reference_desk...at=solarsystem


*** my apology ... this was treBert asking the question and I tried
to make the answer as simple as possible. It appears, he's never
heard of Google ...