Thursday, May 29, 2008
Messier 20, Trifid Nebula
Compare this to the earlier post of M8 and you can see here that the starfield of the Milky Way around M20 lacks the background noise and reddish glow. Stars are more pinpoint. I did pick up some coma in the far upper right; not sure if there was some tube flexure or impact from additional temperature drop.