# Tag Info

From the virial theorem, peculiar velocities resulting from gravitational processes generally have magnitudes of the order of $$V \sim \left(\frac{GM}{R}\right)^{1/2},$$ where $G$ is the gravitational constant, and $M$ and $R$ are the mass and radius of the system. Galaxies Galaxies have peculiar velocities of the order of several 100 km per second; small ...