Galaxy Zoo

What Galaxy Zoo actually is

Galaxy Zoo shows you a telescope image and asks straightforward questions about it: smooth or spiral, how many arms, anything strange in the frame. Answers from many volunteers are combined into morphology catalogues that have supported hundreds of published papers.

Why it is worth your time

Most of these images have never been examined by a person, so the first galaxy you are handed is quite likely the first time anyone has really seen it.

Common questions

Is Galaxy Zoo free?

Yes. Galaxy Zoo is free and does not ask you to register or hand over an email address before you can use it.

How long does Galaxy Zoo take?

Five to fifteen minutes of proper attention. We file it under "Coffee break" — classify a galaxy nobody has ever properly looked at.

Does Galaxy Zoo work on a phone?

Yes. Galaxy Zoo works on a phone as well as it does on a laptop.

What kind of site is Galaxy Zoo?

We list it under Cosmos & Scale — zoom out until you feel small. Most of these images have never been examined by a person, so the first galaxy you are handed is quite likely the first time anyone has really seen it.