Which galaxy is the most massive in the local universe?

Quick Answer

In the Local Group, the Milky Way is not the most massive galaxy; Andromeda is generally estimated to be larger and more massive. Its mass is commonly placed around 1.2 trillion solar masses, though estimates vary.

The Full Story

Among the two dominant galaxies in the Local Group, Andromeda (M31) is generally considered the more massive one. Astronomers estimate its total mass at roughly 1.2 trillion solar masses, though the exact number depends on how much dark matter is included. The Milky Way is also a giant spiral galaxy, but recent measurements typically place it somewhat lower in total mass. Andromeda is about 2.5 million light-years away and is on a slow collision course with the Milky Way. The merger is expected billions of years in the future.

Key Facts

1.Estimated mass: about 1.2 trillion solar masses

2.Distance from Earth: about 2.5 million light-years

3.Expected to merge with the Milky Way in the distant future

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