If you already have a Facebook account, you may want to become a fan of NASA. It is a fun way to keep up with what is happening and to have access to some really fine images. My favorite is the Jupiter rings.
Recommendation: If/when you become a NASA fan, comment about how you and your students are using the NASA information, images, and what else you'd like to see. This is a good opportunity to be visible as a librarian. Be sure to reference curriculum standards that support projects using the NASA information.