When they reach the inner solar system.
Why do comets have tails
No, they do not burn only comets have tails.
yes
No, that would be comets.
Comets
rocks and dust
It depends on how fast the comet is going.
In the sense that an observer can see tails on comets - no, the gravity and composition of Mars is not favorable to the production of a tail.
Because they aren't traveling towards the sun. Comet tails are caused by debries being burned off.
no, only comets develop glowing tails.Fun Fact:some scientists called comets "dirty snowballs"
yes
They are called comets.