Possibly the oldest star cluster in the Milky Way,[4] with an age of more than 12 billion years. Located in an area of the sky known as Baade's Window, named for the astronomer Walter Baade, who first recognized its signficance. Baade's Window is an area of the sky with relatively low amounts of interstellar dust along the line of sight from the Earth, allowing unobstructed observation of the center of our Milky Way galaxy.