On the 50th anniversary of Earth Day, NASA astronaut Chris Cassidy of Expedition 63 reflects on what Earth Day means to him.
This Earth Day, we can still collectively appreciate the beauty of our planet and the extraordinary science that helps us understand how it all works — and we can do it from our homes. Join us in commemorating the 50th anniversary with #EarthDayAtHome.
ESA astronaut André Kuipers and astronaut Don Pettit greet WWF
Luca Parmitano and Chris Cassidy explain what happened during EVA 23
Earth Day 2020: NASA Puts Space to Work for the Planet
NASA Science Live: Earth Day at Home
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