The famous 100-inch telescope used by Edwin Hubble. The data acquired with the 100-inch telescope helped Hubble establish that spiral nebulae are distant galaxies outside the Milky Way, and that the Universe is expanding. To view more pictures of my visit to Mount Wilson Observatory go to http:/​/​rascvic.​zenfolio.​com/​p321284535

Date: September 24, 2011
Location: Mount Wilson, California
Optics: Canon EF 17-40mm f/4L USM
Camera: Canon EOS 7D
Exposure: One single light frame of 1/25 second, f/4, ISO 6400