Spiral galaxy, M31

Andromeda Galaxy

The farthest thing you can see with the naked eye. It is heading towards us at 110 km/s and will merge with the Milky Way in about 4.5 billion years.

Drive there in 3D Could we live in the Andromeda Galaxy? Ask Elon

Distance: 2.5 million light years
Width: 152,000 light years
Stars: ~1 trillion
Approaching at: 110 km/s

Made of

Dark matter 90%
Stars 9%
Gas and dust 1%

Hundreds of billions of stars in a halo of dark matter

Modelled from rotation curves and star counts

Nearby in the guide