the Cave nebula - Sharpless 2-155 / Caldwell 9 - in Cephus
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I think this object has more very different interpretations than any other... at least on the web. First, it is quite faint, there is actually a lot more
red nebulosity in the shadow areas, and there is a fine blue gossimer haze over the majority of the frame...... I just didn't catch enough
photons yet.. This effort is only rgb from the Canon 350d, no Ha... apologies for the extra stretch... this needs about 8 more hours..
 Telescope Explore Scientific David H. Levy Comet Hunter Maksutov-Newtonian 152mm f/4.8 mounted piggyback on Meade LX 200 Classic 12 inch
Camera Canon XT/350d modified with Baader type 1 filter by Hap Griffin
Exposure  12 ten-minute sub-exposures at iso 1600
 Guiding  PHD Guide from Stark labs with Meade DSI pro I on Meade 12-inch LX 200 Classic at f/3.3
 Software  Images acquired, calibrated, stacked and color corrected with Nebulosity 2.2.4 from Stark Labs. Further processing in Photoshop CS 3.
on-line links to more information   for more information try the wikipedia site, there is a fine image by Hunter Wilson