More than one billion people participate in Earth Day, making it the largest civic observance in the world. This year, make sure you join in on the action. Celebrated annually on April 22, Earth Day ...

Billions of years ago, Earth was an uninhabitable rock covered in magma. Scientists are still working to decipher the tale of how it transformed into a blue and green orb teeming with life. However, ...

In April 2029, a 20-million ton asteroid once thought to pose a potentially catastrophic collision risk with the Earth will fly by our home. Apophis, named for the Egyptian god of chaos and evil and ...

Over four millennia ago, in the final days of the Akkadian Empire in Mesopotamia, a drought swept over the region, afflicting lands as far away as Greece and what’s now Pakistan. Probably driven by ...

The science is clear: the patient, our home planet earth, is in critical condition. Patrick Pleul/picture alliance—Getty Images The results of the planet’s first annual physical—a complete health ...

I remember working on my first Earth Day project as a kid in elementary school in Massachusetts, constructing two huge, makeshift Styrofoam spheres showing what our planet looked like at that time and ...

Early in 1993, a manuscript landed in the Nature offices announcing the results of an unusual — even audacious — experiment. The investigators, led by planetary scientist and broadcaster Carl Sagan, ...

Leaving Planet Simple doesn't require rocket ships and interstellar “road trips” to Mars. It demands something potentially more challenging: a paradigm shift in how we understand our relationship with ...