The planet is almost 25,000 miles around and 4.54 billion years old, and humans are still discovering some of the amazing ...

From the moon's formation to the Earth's core, some of the planet's biggest mysteries are still wide open Fascinating ...

Astronauts and robotic spacecraft have captured breathtaking photos of Earth from space for decades. See the best images.

About 71% of Earth’s surface is covered by water, and 96.5% of that water is found in the oceans.

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

How much do you know about our planet? Here are the amazing, odd and downright cool Earth facts scientists learned in the ...

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

In a year of grim climate and environment news, we’ve compiled several hopeful signs about our planet’s future.

Astronomers discover that the rotation speeds of distant planets reveal how they form and evolve in the universe ...

Earth Day 2026 is the largest civic observance on the planet. Yet few organizations mark it. Here are four actions to take ...