“We want to know how our planet works, how we affect it, and how it might change in the future,” NASA Administrator Charles Bolden wrote. “Knowledge is a powerful tool & with it we can all be better stewards of our home planet.”
Children and parents were able to learn about NASA research and satellites, and as Spaceflight Insider reporter Josh Tallis wrote, “Throughout the pavilion, NASA representatives stood huddled over speaking to enraptured children. To them, during an afternoon punctuated by world-famous performers, they could have been rock stars too.”
Further Reading:
+ NASA Among ‘Rock Stars’ at D.C. Earth Day Concert, Spaceflight Insider
+ Flickr photo collection: Global Citizen Earth Day Celebration, April 17, 18, 21, and 22, 2015. Washington, D.C., National Mall and Union Station

Above the Earth, Below the Surface: Landsat’s Role in Monitoring Water Quality
Safeguarding freshwater resources is crucial, and while scientists use a variety of ground-based techniques to gauge water quality, the Landsat program has provided water quality data from orbit for decades.