This year marks the 55th anniversary of Earth Day! Every year on April 22, people worldwide mobilize to address some of the most urgent threats facing our environment, from climate change to ...

This quiz will explore the science behind the scenery, the facts behind the familiar, and the wonders that make Earth a living planet.

Although the Earth completes one full rotation in 86,400 seconds on average, that spin fluctuates by a millisecond or two every day. Before 2020, the Earth never experienced a day shorter than the ...

The ocean basins are so vast and deep that they hold about 97 percent of the Earth's water. Sea water that's trapped in ...

Giant donut-shaped swaths of magnetically trapped, highly energetic charged particles surround Earth. James Van Allen, a physicist at the University of Iowa, discovered these radiation belts in 1958 ...

This striking satellite photo shows 10 swirling "dark voids" that appeared above an uninhabited volcanic island in the Indian Ocean. The black spots are the result of atmospheric cloud vortices, but ...

This eerie satellite photo shows a "devilish" Russian volcano spewing out a 1,000-mile-long river of smoke into Earth's atmosphere. It is a striking reminder of the volcanic power trapped within the ...

Snakes are among the most mysterious and awe-inspiring creatures on the planet. While many people are familiar with venomous snakes or constrictors, few realize just how massive some species can get.