PIA07396: Invisible Galaxies Come to Life! (Artist Concept)
 Mission:  Spitzer Space Telescope
 Product Size:  3000 x 2400 pixels (w x h)
 Produced By:  California Institute of Technology 
 Full-Res TIFF:  PIA07396.tif (18.75 MB)
 Full-Res JPEG:  PIA07396.jpg (578.1 kB)

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This artist's animation demonstrates that an invisible galaxy shrouded in dust can become glaringly bright when viewed in infrared light. The movie begins with a visible-light view, showing a dark blob of a galaxy that is so shrouded in dust it appears invisible. The picture then transitions to what the same region of space might look like in infrared light. A galaxy appears out of the darkness, because its heated dust glows at infrared wavelengths.

NASA's Spitzer Space Telescope uncovered a hidden population of invisible galaxies like these using its highly sensitive infrared eyes. The dusty galaxies are among the brightest in the universe and are located 11 billion light-years away, back to a time when the universe was 3 billion years old. The universe is currently believed to be 13.5 billion years old.

Astronomers are not sure what is lighting up these cosmic behemoths, but they speculate that quasars--the most luminous objects in the universe--may be lurking inside.

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