The corresponding distances for this velocity from the galactic rotation curve are 3 and 14kpc.

It is then possible to use the plot of the rotation curve and the velocity to determine the distance to a certain point within the galaxy.

The presence of dark matter in the halo is demonstrated by its gravitational effect on a spiral galaxy's rotation curve.

The rotation curve (shown in the figure) describes this rotation.

Observations of the rotation curve of spirals, however, do not bear this out.

Astronomers call this phenomenon the "flattening of galaxies' rotation curves".

Finally, no data on the rotation curve of these galaxies was available at the time.

His theory explains galactic rotation curves without invoking dark matter.

The discovery of unexpected rotation curves for galaxies took everyone by surprise.

Later, Moffat claimed that it has also been applied to explain rotation curves of galaxies without invoking "dark matter".