It's absolutely not monochromatic. It's full of colours that we cannot see, we have to use fake colours to visualize objects from space in all their diversity.
Full of colors that we cannot see. Are you saying its like watching a color TV signal on a black and white TV set? Are we just too far away? Would any of those nebulae show such beautiful colors to the human eye if we were only closer? I can never get a straight answer on that.
But if you look at these objects through a small telescope, you will see white blobs.
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.
