Image 1: LBN159 SH2-99 NGC6857 in Cygnus
LBN159 is a dark nebula towards the "Orion Spur" of our galaxy. Dark nebulas are huge amount of dust obstructing the light of the background stars.
Image 2: Digital zoom on both emission nebulas SH2-99 and NGC6857
NGC6857 (up) is a tiny emission nebula having a brightness of 11.4m and an apparent size of 0,6". The second nebula SH2-99 is apparently located under it.