We can see the star sirius and its companion, the pup, moving around each other. Careful measurement of this motion can provide the masses of both stars in the system.
How do stars move?
The stars in our galaxy are all said to be orbiting in a nearly circular path around the center of the galaxy because the immense combined mass of the galaxy, which is mostly near the center, creates immense gravity that pulls all the stars in our galaxy into circular orbits.
The study of astronomy has helped us to understand that Stars rise in the northeast and set in the northwest, moving in counter-clockwise circles around a point that's high above the northern horizon.
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