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Two Micron All Sky Survey
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centre of the Milky Way Galaxy
centre of the Milky Way Galaxy Central regions of the Milky Way Galaxy. The image on the left is in visible light, and the image on the right is in infrared; the marked difference between the two images shows how infrared radiation can penetrate galactic dust. The infrared image is part of the Two Micron All Sky Survey (2MASS), a survey of the entire sky in infrared light.

Two Micron All Sky Survey

astronomical survey
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Also known as: 2MASS
Written by
Erik Gregersen
Erik Gregersen is a senior editor at Encyclopaedia Britannica, specializing in the physical sciences and technology. Before joining Britannica in 2007, he worked at the University of Chicago Press on the...
Erik Gregersen
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The Editors of Encyclopaedia Britannica
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Article History

Two Micron All Sky Survey (2MASS), astronomical survey conducted from 1997 to 2001 of the entire sky at near-infrared wavelengths. Two automated 1.3-metre (4.3-foot) telescopes were used. One was at Mount Hopkins, Arizona; the other was at the Cerro Tololo Inter-American Observatory in Chile. The observed wavelengths were 1.25, 1.65, and 2.17 microns (1 micron is 10−6 metre). The project was a collaboration between the University of Massachusetts at Amherst and the National Aeronautics and Space Administration’s Infrared Processing and Analysis Center in Pasadena, Calif. There were several reasons for conducting 2MASS. There had been a previous survey of the ...(100 of 216 words)

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