So far I have looked for planets near stars and classified galaxies. To find planets, you have to examine how the brightness of stars changes over time. You are presented with a graph of the star's brightness and any drastic variations of the brightness indicate a planet nearby. I did this on planethunters.org.
For the galaxy classification, galaxyzoo.org presents you with images of various galaxies and you are asked to identify the shape, the roundness and any features such as spiral arms, rings, merging of galaxies, dust lanes or irregular shapes.
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