SDSS Sloan Digital Sky Survey

SDSS Sloan Digital Sky Survey

SDSS Sloan Digital Sky Survey

This image shows a section of the three-dimensional map constructed by the Sloan Digital Sky Survey's BOSS project. The rectangle on the far left shows a cutout of 1000 sq. degrees in the sky containing nearly 120,000 galaxies, or roughly 10% of the total survey. The spectroscopic measurements of each galaxy -- every dot in that cutout -- transform the two-dimensional picture into a three-dimensional map, extending our view out to 7 billion years in the past. The brighter regions in this map correspond to the regions of the universe with more galaxies and therefore more dark matter. The extra matter in those regions creates an excess gravitational pull, which makes the map a test of Einstein's theory of gravity. Image credit: Jeremy Tinker and SDSS-III

IMAGE: Jeremy Tinker and SDSS-III
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