Our colossal cosmic neighbor
Chained to the night sky
Andromedans of the silver screen
The cosmic wanderers
YOUR GOAL
Master of Andromedan mysteries from science to starseeds
007skaty Messier 31 spans 220,000 light-years across, harboring vastly more stars than the Milky Way's estimated 100 to 400
007skaty Two glowing spiral galaxies slowly pull together in a massive cosmic collision.
007skaty Decode messages from your space buddy to learn how the Andromeda galaxy compares to ours.
Speeding galaxy: Andromeda is hurtling toward our Milky Way at 110 kilometers per second, but don't panic—the collision won't happen for another 4.5 billion years!
A large spiral galaxy that is the closest major neighbor to the Milky Way. In 1923, Edwin Hubble discovered a Cepheid variable star there, proving it was a separate galaxy.
At what speed are the Milky Way and Andromeda galaxies currently moving toward each other?
In how many billion years is the collision between Andromeda and the Milky Way expected to occur?
Why are individual stars unlikely to collide when the Milky Way and Andromeda merge?