Zooniverse is a very cool project I found out about today. Zooniverse is a collection of "citizen science projects" where citizens contribute to the research and content.
The projects are all about space science: Planet Hunters, Milky Way, Moon Zoo, Solar storms and more. The projects use publicly available information as resources and look for new things about the planets, solar system and more.
The projects are an excellent resource for inquiry based learning in both content and scientific process. There is an education site that has ideas for using Zooniverse in the classroom and there are education resources specifically for the Galaxy Zoo and Solar Stormwatch projects.
There is a huge amount of information and resources available here and they can be used across subjects and grades.