A solar eclipse will be visible across much of the United States on Sunday afternoon. Take a look at the edges of the Sun on May 20, 2012. (Check space.com to learn more about the eclipse and when and how to carefully look for it in your region.)

In honor of the eclipse, this week’s Science Missions are about astronomy. Take a look below for more information about Hubble’s Hidden Treasures, Galaxy Zoo and Planet Hunters. Whether you see the eclipse or not, you can join in these projects as a citizen scientist and help us learn more about the Universe. Also check out the latest in our series of blog posts titled: Citizen Science Test Drive! U.K. guest blogger, Hal Hodson, helps you flex your inner-astronomer’s muscle with a first-person account of Zooniverse, one of dozens of astronomy citizen science projects featured in the SciStarter Project Finder!

Calling all researchers and science team leaders! Are you looking for citizen science volunteers to help with research? SciStarter seeks to bring projects and people together. If you’d like your project featured, submit it to the SciStarter Project Finder for consideration by the editors.

Do you have a favorite App for citizen science? If so, tell us about it. To contribute to this series and share your experiences with our community, email Dr. John Ohab, Director of Community Engagement: john@scistarter.com.