NASA Astronaut Chris Cassidy Commemorates the 50th Earth Day from the In...

One World, Together – This Earth Day marked 50 years of celebrating our beautiful life-giving home planet. People across the globe shared their affection – all from their own homes – with #EarthDayAtHome. One of our NASA astronauts, Chris Cassidy, reflects on what the 50th Earth Day means to him while he is on board the International Space Station.