Galaxy Zoo 2

Code for data reduction and analysis of Galaxy Zoo 2

This project is maintained by willettk

Galaxy Zoo 2

This page hosts code for reducing and analyzing data from the Galaxy Zoo 2 project. Contact Dr. Kyle Willett if you have questions about the project, code, or data availability.

Running and working on the repository

Most of the code is in Python and IDL. The raw data files that the code runs on (consensus classifications for the site) are several hundred MB each, and are not hosted here. Contact the authors if you are interested in getting access to them.

If you have a GitHub account, you should be able to download the code and the data release paper (Willett et al., 2013, MNRAS accepted) from this site. Use the following command:

$ git clone

Or, if you want to make changes to the code/contribute to future papers via git (which would be really cool), you can fork it:

First, click the "Fork" button on Next:

$ cd your_directory
$ git clone
$ git remote add upstream
$ git pull upstream

Make some changes to the draft:

$ vim galaxyzoo2/datapaper/gz2datarelease.tex

Finally, go back to your GitHub page and switch to the branch you've been working on. Click the "Pull Request" button, add a title (eg, "Added reference to 1926 Hubble paper") and hit "Send". If we agree on the changes, I'll accept them and they'll be automatically merged into the upstream repository (ie, the master draft).

Authors and Contributors

Contributors to Galaxy Zoo 2 on GitHub: Chris Lintott (@chrislintott), Steven Bamford (@bamford), Mike Williams (@mikewilliams), and Arfon Smith (@arfon).

Much of the general Galaxy Zoo code is also available at the Zooniverse repo (@zooniverse).

Support or Contact

Having trouble with Pages? Check out the documentation at or contact