atmosphere, air (noun)

Extra-vehicular activity is work done by an astronaut away from the Earth, and outside of a spacecraft.

In spaceflight, a launch vehicle or carrier rocket is a rocket used to carry a payload from the Earth's surface into outer space.

Apollo 8 was the first manned space voyage to achieve a velocity sufficient to allow escape from the gravitational field of planet Earth; the first to escape from the gravitational field of another celestial body; and the first manned voyage to return to planet Earth from another celestial body.

The water cycle, also known as the hydrologic cycle, describes the continuous movement of water on, above, and below the surface of the Earth.

Eriador is a large region inJ.R.R. Tolkien's fictional world of Middle-earth.

Hyperbaric medicine, also known as hyperbaric oxygen therapy, is the medical use of oxygen at a level higher than atmospheric pressure.

Space debris or orbital debris, also called space junk and space waste, are the objects in orbit around Earth created by humans, and that no longer serve any useful purpose.