Hints: spectroscope galaxy whizzing Dresslar NGC 1068 Andromeda.

The spectroscope shows the center of the galaxy as a white band and the movement of stars around the core is traced by a dark, vertical line. If the stars of the galaxy's center are circling slowly, then the dark band would show hardly any change, but if they are traveling at great speed, whizzing towards and away from us either side of a supermassive black hole, then the dark band should show a sudden shift across the center of the galaxy.
I would expect to see some rather rapid change in this dark line so that there'd be a very big change in the speed from one side of the galaxy to the other, very suddenly, right over the center and that would show that the stars were moving very rapidly in the center of the galaxy because of the influence of the great mass in the center, the supermassive black hole.
Over the next a few nights, Dresslar measured the speed of the stars in NGC 1068 and in Andromeda.

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