page_title: Sky
section_title: Use in transportation
hierarchical_section_title: Sky / Use in transportation
context_page_description: The sky is everything that lies above the surface of the Earth, including the atmosphere and outer space.
  In the field of astronomy, the sky is also called the celestial sphere. This is an abstract sphere, concentric to the Earth, on which the Sun, Moon, planets, and stars appear to be drifting. The celestial sphere is conventionally divided into designated areas called constellations.
  Usually, the term sky informally refers to a perspective from the Earth's surface; however, the meaning and usage can vary. An observer on the surface of the Earth can see a small part of the sky, which resembles a dome appearing flatter during the day than at night. In some cases, such as in discussing the weather, the sky refers to only the lower, denser layers of the atmosphere.
  The daytime sky appears blue because air molecules scatter shorter wavelengths of sunlight more than longer ones. The night sky appears to be a mostly dark surface or region spangled with stars. The Sun and sometimes the Moon are visible in the daytime sky unless obscured by clouds. At night, the Moon, planets, and stars are similarly visible in the sky.
context_section_description: Flight is the process by which an object  moves through or beyond the sky (as in the case of spaceflight), whether by generating aerodynamic lift, propulsive thrust, aerostatically using buoyancy, or by ballistic movement, without any direct mechanical support from the ground.  The engineering aspects of flight are studied in aerospace engineering which is subdivided into aeronautics, which is the study of vehicles that travel through the air, and astronautics, the study of vehicles that travel through space, and in ballistics, the study of the flight of projectiles.  While human beings have been capable of flight via hot air balloons since 1783, other species have used flight for significantly longer.  Animals, such as birds, bats, and insects are capable of flight.  Spores and seeds from plants use flight, via use of the wind, as a method of propagating their species.
caption: Jupiter, Ancient Roman sky deity
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