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, the STEM in 30 team look at the beginnings of Earth Day and how a better understanding of our place in the universe has evolved through photographic scientific discoveries.

This program is made possible through the generous support of Boeing.

See more from STEM in 30: http://airandspace.si.edu/stemin30