When you look at photographs of Earth from space, the planet looks like a blue marble, with patterns of clouds lying on the surface of the marble. It seems as if Earth's atmosphere is incredibly ...

The extent of the Earth’s boundaries and the beginning of space revealed that no astronauts in the history of spaceflight had ...

The Earth’s atmosphere is the relatively thin layer of gases surrounding the planet. The atmosphere is held close to Earth by gravity, but the higher you go away from the Earth’s surface ...