It's been way too long since I've done one of these, so here goes. And by the way, this one is pretty epic. Be prepared to be blown away in astral proportions.
I'm talking about a planetary nebula, or, to put it simply, a ring-shaped nebula formed by an expanding shell of gas around an aging star. There are approximately 10,000 out there in space, and each has very specific defining characteristics. This makes it relatively easy to nick name, albeit an official scientific name is given as well (at least, as far as I recall).
One noteworthy discovery is Little Gem, as you'll no doubt see why. Another might be Abell 30, although very standard in my opinion.
more info here and here about the basics of planetary nebulae.
space worthy dubstep here