Near and far infrared, ultraviolet, x-rays, gamma rays -- there are lots of photons out there. Hubble has many sensors[0], so many of the images taken are from

Near and far infrared, ultraviolet, x-rays, gamma rays -- there are lots of photons out there. Hubble has many sensors[0], so many of the images taken are from outside the relatively small portion of the spectrum that humans can see and then mapped to the visible spectrum. Additionally, human vision is dominated by intensity sensitivity, not color sensitivity.[1] So especially with very modest optical equipment and faint light sources you won't see much color. [0]http://hubblesite.org/the_telescope/hubble_essentials/ http://hubblesite.org/the_telescope/hubble_essentials/ [1]http://hyperphysics.phy-astr.gsu.edu/hbase/vision/rodcone.html http://hyperphysics.phy-astr.gsu.edu/hbase/vision/rodcone.ht...