Old and 'Red' Distant Galaxies
January 23, 2006
This image provides a close-up look at two of the extremely bright infrared galaxies revealed by NASA's Spitzer Space Telescope. While they are very faint (bottom) or even completely invisible (top) in the deepest-ever optical images obtained by NASA's Hubble Space Telescope, Spitzer easily picked them up because of their strong infrared emissions. Astronomers believe these galaxies are particularly "red" because they are very old and appear to go back in time to a period when the universe was only two billion years old.
Topics: Technology Internet, Spitzer Space Telescope, Galaxy, Hubble Space Telescope, National Aeronautics and Space Administration, Great Observatories Origins Deep Survey, Hubble Deep Field, Infrared