Astronomy Picture of the Day . The Shuttle Launches an Inflatable Antenna . ... In the Center of 30 Doradus . ... In the center of 30 Doradus lies a huge cluster of the largest, hottest, most massive stars known. The center of this cluster, known as R136, is boxed in the upper right portion of the above picture. The Violent Star Cluster 30 Doradus . ... The largest, most violent star forming region known in the whole Local Group of galaxies lies in our neighboring galaxy the LMC. ...