The Horsehead Nebula in Orion

The easy to identify Horsehead and nearby Flame (or Christmas Tree) nebulae are invisible wonders in what many Australians refer-to as the Saucepan, the base of which, is really Orion's Belt. Everything in this picture is invisible to the unaided eye, except for one or two of the brightest stars. Taken with a 4" Takahashi Apo refractor telescope with f3.7 reducer. f.l = 220mm. SBIG 3.2 megapixel cooled ccd camera with Astrodon RB, Ha and OIII filters. Total Exposure Time: 17.3 hours.