With a radius of 3,959 miles, Earth is the fifth largest planet in our solar system, and it's the only one known for sure to have liquid water on its surface. Earth is also unique in terms of ...

The Earth's interior is composed of four layers, three solid and one liquid—not magma but molten metal, nearly as hot as the surface of the sun. The deepest layer is a solid iron ball ...

The U.S.-India NISAR mission will track Earth's surface changes weekly, offering insights into glaciers, forests, and ...

Curious Kids is a series for children of all ages ... the air pressure continuously increases. Ultimately you hit Earth’s surface, either land or water. Compare that with Jupiter: Start near ...