Since the Hubble Telescope was launched, some of the most amazing images and discoveries it has made are in the “Ultra Deep Field”, viewing galaxies that first transmitted light 13-billion years ago. Now, researchers have taken these images and offset the galaxies by their computed red-shift and created a fantastic 3D model of the “ultra deep field”.
See the video, covering the capture of these images and how the red-shift works, after the break.
Could it be a weight thing? The hubble probably isn’t very light, and the shuttle isn’t the most agile of airplanes on the way back down. I think they dump all their left-over fuel in orbit to lighten the downstream load, so I can see them saying “Nah, hubble’s too heavy”