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Extragalactic Astronomy

Infrared Hubble Deep Field
Image Credit: Wang, W.-H., et al.
Infrared Hubble Deep Field
Hubble Deep Feild and its surrounding field in the infrared. The color image is a combination and deep images taken at 2.1 um (blue) by CFHT, 3.6 and 4.5 um (green) by Spitzer, and 5.8 and 8.0 um (red) by Spitzer.
To understand the formation and evolution of galaxies, it is necessary to take deep images of the sky. In such images, there can be several thousands to millions of faint galaxies. Astronomers study the color, brightness, and spatial distribution of these galaxies, to infer how galaxies form, grow, and evolve through the cosmic time. The most famous deep image of the sky is the Hubble Deep Field, originally observed by the Hubble Space Telescope in the visible light. Because of the expansion of the universe, visible light from the most distant galaxies redshifts to the infrared wavelengths. Therefore it is also important to study distant galaxies in the infrared. This picture combines deep infrared images taken on the ground and in the space, by the Canada-France-Hawaii Telescope on Mauna Kea and by the Spitzer Space Telescope.
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