NEWTON'S LAW OF GRAVITY
The graph shows how fast stars should be able to rotate without being flung into the universe, when there is only the mass of stars and gases at the centre of the galaxy to maintain the stars in their orbits.
The graph shows how fast stars should be able to rotate without being flung into the universe, when there is only the mass of stars and gases at the centre of the galaxy to maintain the stars in their orbits.