Local Group timing argument
= Local Group timing argument
{c}
The Local Group timing argument treats the Milky Way and M31 as a nearly radial two-body orbit whose present separation, approach speed, and cosmic age constrain their total mass.
= Local Group timing argument
{c}
The Local Group timing argument treats the Milky Way and M31 as a nearly radial two-body orbit whose present separation, approach speed, and cosmic age constrain their total mass.