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9th Space Division
The 9th Space Division (9th SD) is an inactive United States Air Force organization. Its last assignment was with Air Force Space Command, being stationed at Patrick Air Force Base, Florida. It was inactivated on 1 October 1991. History Tactical Air Command The organization has had several periods of activation over its lifetime. Initially established in April 1949 as the 9th Air Division (Tactical) under Fourteenth Air Force, Continental Air Command at Pope Air Force Base, North Carolina, the command had no units assigned but was to act as a headquarters over tactical units. It was inactivated in August 1950. Air defense It was redesignated 9th Air Division (Defense) and reactivated in October 1954 by Air Defense Command (ADC) and assigned to Western Air Defense Force (WADF) at Geiger Field, Washington, taking over control of air defense units in eastern Washington, Oregon and Idaho from the 25th Air Division (AD), after the 25th AD was realigned over the Washington and Oregon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Air Force Space Command
The atmosphere of Earth is the layer of gases, known collectively as air, retained by Earth's gravity that surrounds the planet and forms its planetary atmosphere. The atmosphere of Earth protects life on Earth by creating pressure allowing for liquid water to exist on the Earth's surface, absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night (the diurnal temperature variation). By mole fraction (i.e., by number of molecules), dry air contains 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere. Air composition, temperature, and atmospheric pressure vary with altitude. Within the atmosphere, air suitable for use in photosynthesis by terrestrial plants and breathing of terrestrial animals is found only in E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
