The Nikon D90 has a very low “dark current”, which makes it better suitable than the previous D70 and D80 for “deep” sky photo’s. Here are some examples:
Core of the the Orion nebula:
4x 30s ISO1600 @F10(?) C8/LXD75 mount, rough polar alignment
Pleiades: (f=200mm f/5.6 ISO200, 4x 180s)
Orion as a whole:
Andromeda nebula:
