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What does SDG stand for?

SDG stands for Sagittarius Dwarf Galaxy (astronomy)

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Samples in periodicals archive:

A team of astronomers led by Sergey Koposov and Vasily Belokurov of Cambridge University recently discovered two streams of stars in the Southern Galactic hemisphere that were torn off the Sagittarius dwarf galaxy y analysing data from the latest Sloan Digital Sky Survey (SDSS-III).
Using observations of such tidal debris from a dwarf known as the Sagittarius Dwarf Galaxy, astronomers have been able to reconstruct the orbit of Sagittarius and derive models for the Milky Way and its dark-matter halo.
He and his colleagues note that the stream of stars lies near the center of the Sagittarius dwarf galaxy, a small galaxy that is currently being torn apart by the Milky Way.