15 photos that prove Earth is far stranger than any science fiction.

Did you know that when scientists wanted to test the Mars rover, they went to Chile? It turns out there are a lot of places on Earth that are totally out of this world.

1. The Atacama Desert in South America is so dry, NASA has used it to test Mars rovers.

It even has a reddish surface. Image from ESO/Wikimedia Commons.

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Earth Day

While world leaders were traveling to Paris to attempt to finally agree on what to do about climate change, people all over the world got together to hold their feet to the fire.

The ostensible goal of the COP21 conference in France is to produce a legally binding agreement that will help reduce emissions and slow down global warming. But climate change is already here, and the usual conference scenario — lots of important people talking a lot while getting little done — ain't gonna cut it anymore.

That's why this weekend, hundreds of thousands of people around the world gathered to send a message to their leaders:

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