How does the mass of the Milky Way’s halo compare with the mass of its visible parts?

The massive halo of the Milky Way Galaxy is a giant, poorly understood component that extends well beyond the galaxy's visible parts, reaching distances significantly greater than 100,000 light-years from the center.1

Regarding its mass, current astronomical understanding indicates that the halo is substantially more massive than the rest of the galaxy combined. While the total mass of the Milky Way remains a subject of uncertainty due to the presence of dark matter, estimates suggest the galaxy's total mass is at least several hundred billion, and possibly as high as one trillion, times the mass of the Sun. The halo's mass is estimated to be several times greater than the mass of all other galactic components taken together.21

This massive halo is largely composed of undetected dark matter, which does not emit light at any wavelength and is inferred primarily through its gravitational effects on the rotation of the galaxy.12