Comet Hyakutake 

Comet Hyakutake in Ursae Minor, photographed March 27, 1996 from Little Mountain, Utah 
Nikkor 135mm F:2.5 lens wide open, Ektachrome 400, about 3 minutes exposure
This is the same image, enhanced with Maxim DL to bring out detail in the ion tail of the comet.