Earth Day began as a protest in 1970, but its meaning has evolved. Here’s how it changed - and what it represents today.

Earth’s story may have hardened into place almost as soon as the Solar System began. That is the striking claim in new ...

Scientists have seemingly settled long-standing arguments about whether the components of Earth originated from the inner or ...

Earth Day, which began in 1970, is celebrated each year on April 22.

For the first time, scientists have watched a subduction zone literally fall apart beneath the ocean floor. Using advanced ...

Millions of people around the world will pause, at least for a moment, to mark Earth Day. The annual event is Wednesday.

From time to time, the Earth's magnetic poles flip, leaving us without a protective magnetic field for up to centuries ...

See stunning photos of Earth taken from space by astronauts and robotic spacecraft, celebrating our home planet on Earth Day.

Scientists have found that the crust beneath East Africa’s Turkana Rift is thinning to a critical point, signaling that the ...

Understanding how to explore hidden glaciers on Mars begins not in a laboratory, but in remote field camps across Alaska and Wyoming.