In Module 6, we used radio observations of the Andromeda Galaxy that we entered into Skynet. The goal was to measure the neutral hydrogen that was already existing in the Galaxy. We used the natural frequency of the hydrogen as well as the Doppler Shift. We also used this to map out the large variety of frequencies that were used. The broadband frequency was between 1420.4 MHz and 14.23 MHz.
In these photos, you can see that the blue section is moving away from us while the red section is coming towards us, which means that the green would be the center of the Galaxy. We then used the photo and the small angle formula to calculate the speed of the spin rate and the mass.