Date Taken: 11/12/2010
Equipment: 12.5" PlaneWave Telescope with SBIG 10XME camera;
Exposures: RGB 20 min. each, Lum-30 min. Processing: MaximDL and Photoshop
NGC 891 (also known as Caldwell 23) is an edge-on unbarred spiral galaxy about 30 million light-years away in the constellation Andromeda.
Although this galaxy looks as we think our own galaxy would look like when viewed edge-on, recent high-resolution images of its dusty disk show unusual filamentary. These patterns are extending into the halo of the galaxy, away from its galactic disk. Scientists presume that supernova explosions caused this interstellar dust to be thrown out of the galactic disk toward the halo. But this explosive hypothesis may not be right. It may also be possible that the light pressure from surrounding stars causes this phenomenon