The Inside of the Milky Way Galaxy in 3-D

Scientists at the Max Planck Institute for Extraterrestrial Physics have produced the first detailed three-dimensional map of the stars that form the inner regions of our Milky Way, using publicly available VVV survey data from the science archive facility at ESO. They find a box/peanut shaped bulge with an elongated bar and a prominent X-structure, which had been hinted at in previous studies. This indicates that the Milky Way was originally a pure disk of stars, which then formed a thin bar, before buckling into the box/peanut shape seen today. The new map can be used for more detailed studies of the dynamics and evolution of our Milky Way.

English: Artist's conception of the spiral str...

English: Artist’s conception of the spiral structure of the Milky Way with two major stellar arms and a central bar. “Using infrared images from NASA’s Spitzer Space Telescope, scientists have discovered that the Milky Way’s elegant spiral structure is dominated by just two arms wrapping off the ends of a central bar of stars. Previously, our galaxy was thought to possess four major arms.” (Photo credit: Wikipedia)

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