Astronauts in low-Earth orbit see 16 sunrises andsunsets every day due to their high orbital velocity (more than 17,000 mph, or28,000 kph). Images:Earth From Above Top 10Views of Earth From Space ...

Earth’s atmosphere has five major and several secondary layers. From lowest to highest, the major layers are the troposphere, stratosphere, mesosphere, thermosphere and exosphere. "The Snow ...

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, about ...