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Galaxy Zoo

By Murray Cumming

This app is only available on the App Store for iOS devices.


To understand how galaxies have formed, astronomers need your help to classify them according to their shapes. If you're quick, you may even be the first person to see the galaxies you're asked to classify. Images come from telescopes including Hubble and the Sloan Digital Sky Survey.

This app caches several subjects locally so you can classify even while offline and have the classifications automatically uploaded later.

To learn more about the Galaxy Zoo project and our science, visit

*** The sequence of questions is determined by the Galaxy Zoo project and is consistent with the web UI.

What's New in Version 1.18

* Use the latest Galaxy Zoo surveys. (Gama 12, SDSS Lost Set, and Illustris surveys.)
* Show web pages inside the app instead of in the browser.


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iPad Screenshot 1
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Customer Reviews

App doesn't work that well, but the content is beautiful

I LOVE looking at galaxies. I could do it all day, every day. When I look at them, I imagine all of the life that's out there living in them somewhere at this very moment. It's literally thousands of worlds of possibilities in each little galaxy that comes up. Fascinating!

That said ,the app itself needs a lot of work. It crashes and sometimes refuses to load any content until I delete and reinstall it. Other times, it randomly loads options for some galaxies and not others. It's far from ideal. I'll put up with it in order to spend hours staring at the wonders of the universe, and to help, but a better app would be pretty awesome, just sayin'. ;)

Galaxy Zoo
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This app is designed for both iPhone and iPad
  • Free
  • Category: Education
  • Updated:
  • Version: 1.18
  • Size: 11.1 MB
  • Languages: English, German
  • Seller:

Compatibility: Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.

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