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This infrared view reveals galaxies far, far away that existed long, long ago. Taken by the Near Infrared Camera and Multi-object Spectrometer aboard NASA's Hubble Space Telescope, the image is part of the Hubble Ultra Deep Field survey, the deepest portrait ever taken of the universe. This galaxy-studded view represents a "deep" core sample of the universe, cutting across billions of light-years.

This infrared image offers a slightly farther look into the universe's past, compared with the snapshot of the same field taken in visible light by Hubble's Advanced Camera for Surveys. Astronomers used Hubble's near-infrared camera to find very distant galaxies that cannot be seen in visible light. The light from remote galaxies has been stretched from visible to invisible infrared wavelengths by the expansion of space. Some light also has been absorbed by intergalactic hydrogen.

Astronomers are hoping to strike it rich by finding some of the farthest known galaxies, existing perhaps 400 million years after the big bang. To find them, astronomers must combine the infrared and visible-light images. The remotest galaxies will only appear in the infrared image. If discovered, these record-breaking galaxies may offer clues to the emergence of galaxies when the universe was only 2 to 5 percent of its present age.

The Ultra Deep Field observations represent a narrow, deep view of the cosmos. Peering into the Ultra Deep Field is like looking through an eight-foot-long soda straw.

In ground-based photographs, the patch of sky in which the galaxies reside (just one-tenth the diameter of the full Moon) is largely empty. Located in the constellation Fornax, the region is so empty that only a handful of stars within the Milky Way galaxy can be seen in the image.

This composite image was assembled from exposures taken by the near-infrared camera and the advanced camera. Astronomers incorporated the advanced camera's visible-light observations into the image to better discriminate the colors of the distant galaxies. The near-infrared camera observations were taken from Sept. 3 to Nov. 27, 2003.

Object Name(s): Hubble Ultra Deep Field, HUDF


Photo Credit: NASA

Content Source: NASA