Multimedia Gallery
January 9, 2007
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Luminous gas appears red and dark matter appears blue, in this image of colliding galaxies.
Astronomers observing a rare collision of galaxies made the first direct detection of "dark matter." In this image, the luminous gas from the collision (red) lags behind the two clusters of dark matter (blue).
Credit: Marusa Bradac, Kavli Institute for Particle Astrophysics and Cosmology
Images credited to the National Science Foundation, a federal agency, are in the public domain. The images were created by employees of the United States Government as part of their official duties or prepared by contractors as "works for hire" for NSF. You may freely use NSF-credited images and, at your discretion, credit NSF with a "Courtesy: National Science Foundation" notation.
Additional information about general usage can be found in Conditions.
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