red_shifted mp21k The "Red Shift" across_the_Universe:- Early in this century, astronomers noticed that distant galaxies had peculiar light spectra. Specifically, the galaxies' light spectra were shifted toward the red end of the spectrum. In 1929 astronomer Edwin Hubble compared the galaxies' spectra with their distances, calculated using different methods, and showed that the amount of "red shift" was proportional to distance. Hubble and others realized that the most obvious explanation for the "red shift" was that the galaxies were receding from Earth and each other, and the farther the galaxy, the faster the recession. http://www.arachnoid.com/sky/redshift.html 040814 ... mp21k Chandra X-ray Image of MACSJ1423.8+2404 The Chandra X-ray image of the galaxy cluster MACSJ1423 shows hot gas displayed in red. http://chandra.harvard.edu/photo/2004/darkenergy/macsj1423_xray.jpg This galaxy cluster has a redshift of 0.54, at a distance corresponding to a light travel time of 5.4 billion years. http://chandra.harvard.edu/photo/2004/darkenergy/more.html 040814 ... mp21k * The Hubble Deep Field * http://physicsweb.org/box/world/12/5/9/pw-12-5-9-fig2 The most distant galaxies in the Hubble Deep Fields have redshifts in excess of 3.5, indicating that their light has been travelling towards us for about 85% of the age of the universe. 040814 ... . Red Shift vs. Fraction of Age of Universe:- http://physicsweb.org/objects/world/12/5/9/pw-12-5-9-fig1.gif For instance, when we observe a galaxy with redshift = 2, we see that galaxy as it appeared when the universe was only 20% of its current age. 040814 what's it to you? who go blather from