where is the comet tail? please help

[jcyf007]

i am using celestia 1.40 and when i viewed halley,i discovered that no comet tail appeared around halley and i checked that i have ticked the comet tail in the option.Moreover, only fading colour of comet tail shown in other 2 comets,can anybody tell me what happen?thank you.

[selden]

Comet tails only appear when a comet comes within about 5-6 AU of the sun. Celestia was recently updated to take this into account.