The stars that were monitored in this astronomical survey were all located in the Sagittarius-I Window , a rare transparent view to the Milky Way 's central bulge stars in the Sagittarius constellation as our view to most of the galaxy 's central stars is blocked by lanes of dust .
This is a rare transparent look at the huge group of closely packed stars at the Milky Way 's center ( central bulge ) , in the Sagittarius constellation .