How massive is the Milky Way?
Milky Way is the second-largest galaxy in the Local Group. The Milky Way is about 1,000,000,000,000,000,000 km (about 100,000 light years or about 30 kpc) across . The Sun lies about 8 kpc from the centre in the Orion Arm of the Milky Way. It has a mass that is 1.5 trillion times the mass of the Sun.