Students gathered over 50 sets of data
concerning the motion of Hydrogen in the
Galaxy. Hydrogen emits radio waves at a
frequency of 1420.41 MHz.
By pointing the telescope at different Galactic
longitudes and gathering data about the
frequency shifts of the Hydrogen students
discerned that the Milky Way is indeed rotating.
Students also detected clumps of Hydrogen
atoms in the Milky Way at periodic intervals. This
allowed them to deduce that the Milky Way
Galaxy is indeed a spiral galaxy.