530be1823ae74079c3005345
Large sunspot group near the limb of the Sun. Image from http://www.sunspotter.org, taken by the Michelson Doppler Imager on board SOHO

 

Some of you may remember back in February we launched a new project called Sunspotter. It was only a soft launch with a a small dataset that was classified very quickly by our volunteers. Well, it’s back! But this time there is plenty of data to go through; with over 200,000 images of sunspot groups that we need your help to classify. Get involved now at www.sunspotter.org

WARNING: This project can be VERY addictive!