Nebulae and comet tails

[Werewolf420]

Can someone tell me why i have nebula selected and i cant seem to track them? or why i cant see the comet tails even though i selected to view them?

[t00fri]

Can someone tell me why i have nebula selected and i cant seem to track them? or why i cant see the comet tails even though i selected to view them?

You certainly are aware that comet tails vanish beyond a distance of the comet of ~ 5 AU from sol. So I take it for granted that you selected only comets that are closer than 5 AU at the time considered? Hence what comets did you exactly select at which time that did NOT show a tail and were closer than 5 AU to sol???

Go and look up some dates when e.g. the comet Halley was close by and I promise you will see a loooooooooooooooong tail

As to nebulae, their implementation is still under heavy development. If you look for galaxies instead, you will most certainly be successful whichever galaxy you choose...

Bye Fridger

[selden]

Exactly what Nebula are you unable to "track"?
Where did you get it?

Celestia does not (yet) come with any Nebula objects. The ones currently available are all Addons.

[Fightspit]

Go and look up some dates when e.g. the comet Halley was close by and I promise you will see a loooooooooooooooong tail

Here the biggest tail of the solar system :

cel://Follow/C1965_S1(Ikeya-Seki)/2842-05-03T10:04:30.65939?x=QPLOslfA2I1yDA&y=ClKqX3INugIW&z=VYMdiybCw98b&ow=0.745077&ox=-0.079462&oy=0.571380&oz=0.334771&select=C1965_S1(Ikeya-Seki)&fov=27.718887&ts=0.000000&ltd=0&rf=300979&lm=2

and

cel://Follow/C1965_S1(Ikeya-Seki)/2842-05-03T10:04:30.65939?x=VGcTG4kJyrC9DA&y=1XLmf+7mNRI&z=EEpAwJezJxk&ow=0.834553&ox=0.116898&oy=0.200631&oz=0.499604&select=C1965_S1(Ikeya-Seki)&fov=27.718891&ts=0.000000&ltd=0&rf=300979&lm=2

[selden]

Fightspit,

Unfortunately, I see nothing at those locations.
I suspect they're pointing to Addons that aren't included with Celestia. You'll need to tell us which Addons they are, or provide URLs of comets that are included with Celestia.