The people of Earth didn't see a photo of our planet until the late 1960s. Photos of Earth changed the way we think about our planet. In this webcast we look at the beginnings of Earth Day and how a better understanding of our place in the universe has evolved through photographic scientific discoveries. Visit the full archived lesson with pictures and audience comments here.
Originally presented on April 22, 2015 | Explore the Support Materials below for the archived live-stream content with questions, comments, and images shared during the live event.