Quick Read
Andromeda is a large nearby galaxy that can be seen from Earth under dark skies.
Learn More
A representative stellar-disk diameter is about 152,000 light-years, although the measured edge depends on the chosen criterion.
In Depth
Its halo extends much farther than the bright disk. This explorer uses the stellar disk for a consistent comparison.
Scale measurement
152,000 ly · diameter
Quick facts
- It is Messier object M31.
- It belongs to the Local Group.
- It is a spiral galaxy.
Related objects
- member-of: Local Group
- compared-with: Milky Way