The map, called the 2MASS Redshift Survey, spans a distance of 380 million light years, and took over ten years to complete.posted by gman at 9:59 AM on May 28, 2011
Scientists collected data for the map by scanning near-infrared light, the spectral region where interstellar dust is most transparent. The researchers discovered over 43,00 galaxies. The map is color coded so that the most distant galaxies are red, and nearby galaxies purple.
The scientists initially had a 2D image that did not account for distances, and so turned to redshift calculations to formulate a 3D image. The light from distant galaxies experiences redshift, an increase in wavelength, as a result of the expansion of the universe. Galaxies farther away have higher redshift, and so scientists can use these measurements to calculate galaxy distances.
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posted by riruro at 9:32 AM on May 28, 2011