Q:  What sort of telescope would be best suited for observing
             circumstellar disks of this sort?


          A telescope optimized for mid-to-far infrared wavelengths.
 

  Q:  Why?  Give at least TWO reasons.


          1) because the dust in the disk emits most of its radiation
                  at those wavelengths

          2) because light of such long wavelengths -- unlike optical
                   light -- can penetrate the clouds of gas and dust
                   which might surround a young stellar system