It's not the name of a Japanese scifi movie...Scientists have spotted stellar fossils in the center of the Milky Way, globular clusters orbiting in the central bulge which seem to have come from somewhere else. Like all fossils these are vital evidence of the evolutionary processes which led to everything we see today.
This composition indicates that Terzan 5 evolved its stellar populations as a dwarf galaxy, and must once have been much larger than it is now. As old stars explode in supernovae they spread newly created material huge distances across space - so subsequently formed stars begin with more of these distinctive elements. But the blasts are so gigantic they would throw this starborne material right out of the current globular cluster - indicating Terzan 5 and others like it were once small galaxies in their own right.
It seems the Milky Way's massive bulge (and others like it) accrete over time as dwarf galaxies erode and are eaten up by passers-by.
The Daily Galaxy via ESO
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