Our Sun, Moon and our Earth was acquired from our parent Galaxy called Sagittarius Dwarf by the Milky Way! So, we came into our new home. And Milky Way is in the habit of devouring numerous smaller galaxies. So even in the cosmos… it is big fish (or galaxies) eat the small ones!
"After slow, continuous gnawing by the Milky Way, Sagittarius has been whittled down to the point that it cannot hold itself together much longer," said 2MASS Science Team member and study co-author Martin Weinberg of the University of Massachusetts. "We are seeing Sagittarius at the very end of its life as an intact system."
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