Zooniverse

Galaxy Zoo
Classify galaxies—photographed by the Hubble spacecraft—according to their shapes.
Difficulty Very easy

Planet Hunters
Find planets orbiting stars by judging the amount of light a star gives off. Look at data from the Kepler spacecraft, and mark a star when it dips in brightness.
Difficulty Easy

Moon Zoo
Help chart the moon’s surface by spotting craters, boulders and interesting features, such as channels and cracks. You might even see spacecraft debris or man-made footprints.
Difficulty Medium

Ancient Lives Project
View the Egypt Exploration Society’s ancient papyri and help decode text by attributing each letter to a symbol on a keyboard.
Difficulty Easy