§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.
§