On this Earth Day, explore remote, uninhabited Henderson Island in the South Pacific. It may look idyllic from above, but is littered with millions of tons of plastic.
Launched last week, TESS will scan 200,000 close and bright stars, seeking new planets and possibly livable worlds. Here's a roundtable discussion with 2 scientists on the TESS mission.
NASA's Lunar Reconnaissance Orbiter (LRO) captured a unique view of Earth from the spacecraft's vantage point in orbit around the moon on October 12, 2015. More images here.
In the late 1960s, there were love-ins, be-ins … and, like the first Earth Day, teach-ins. Here are two organizers of the first Earth Day in 1970. Image via earthday2013funphotos.com.
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