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.
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