... An object like a quasar does not produce very many photons (well, actually it ... A typical quasar may produce less than 10 total photons per second detected! ... This is for a typical quasar in the near ultra-violet range using numbers for STIS ...
... Faint Object Spectrograph measures the light of spectrum to detect the chemical make up of comets and quasars and to determine the speed at which that light travels. ...
... Actually, another funny thing is the picture that goes with the caption: it's a nice image of a field of stars, galaxies and quasars taken by my colleague and friend Gerry Williger. ...
... This is a very powerful tool for finding out things such as how galaxies and stars form, and what very hot objects like quasars and supernovae look like. ...