Historical photographs

Map of the SDSS Universe. Learn from the experience

Map of the SDSS Universe. Learn from the experience


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October 2003. The most recent map of the cosmos again indicates that dark matter and dark energy predominate in our universe. The Sloan Digital Sky Survey (SDSS) is aimed at measuring distances to more than one million galaxies.

After identifying the galaxies in two-dimensional images as shown above, the distance is measured to create the three-dimensional map. The SDSS currently reports three-dimensional information for more than 200,000 galaxies, rivaling the 3D galaxy count of the Celestial Field Map in Two Degrees ("Two-Degree Field").

The last SDSS map, shown above left, could show the distribution of galaxies only if the universe was composed and had evolved in a certain way. After trying to adapt several candidate universes, the Cinderella universe that best fits the map in the photo has 5% atoms, 25% dark matter and 70% dark energy.

Such a universe was previously postulated since its recent rapid expansion may explain why distant supernovae are so opaque, and their early evolution may explain the distribution of points in the very distant cosmic microwave background.

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