Q:  This cloud is located about 7000 pc away from the Sun, close
         to the center of the Milky Way (which is about 8000 pc away
         from the Sun).

      Use the angular extent of this map to estimate the linear size
         of the molecular cloud.


         To a decent approximation, the linear size is given by


               L   =   d * tan(theta)

                   =   (7000 pc) * tan(0.4 degrees)

                   =   49 pc


          Again, big!