A large solar coronal mass ejection could put astronauts, airline passengers, power grids, electronic devices, and satellites at risk. Participants in the Solar Stormwatch citizen science project estimate the size and shape of coronal mass ejections using pictures taken by the NASA STEREO Spacecraft. So far in addition to having the thrill of discovery these citizen scientists have contributed to 7 scientific papers. To learn how to do this exciting research and become a member of a world wide community of solar storm watchers go to the Solar Stormwatch II website.