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The troposphere is the lowest layer of Earth's atmosphere. It extends from Earth's surface to an average height of about 12 km (7.5 mi; 39,000 ft), although this altitude varies from about 9 km (5.6 mi; 30,000 ft) at the geographic poles to 17 km (11 mi; 56,000 ft) at the Equator, [23] with some variation due
1.45136 92348 83381 05028 [Mw 18] ... where agm is the arithmetic–geometric mean and ... 1.00000 00000 [1; ] Phi, Golden ratio
The density of air or atmospheric density, denoted ρ, [1] is the mass per unit volume of Earth's atmosphere. Air density, like air pressure, decreases with increasing altitude. Air density, like air pressure, decreases with increasing altitude.
Moon's orbital distance from Earth 10 9: 1 gigameter 1.39 Gm Diameter of the Sun: 5.15 Gm Greatest mileage ever recorded by a car (3.2 million miles by a 1966 Volvo P-1800S) [38] 10 10: 10 Gm: 18 Gm Approximately one light-minute: 10 11: 100 Gm: 150 Gm 1 astronomical unit (au); mean distance between Earth and Sun 10 12: 1 terameter (Tm) 1.3 Tm
The station orbits the Earth at an average altitude of 400 kilometres (250 miles) [12] and circles the Earth in roughly 93 minutes, completing 15.5 orbits per day. [ 13 ] The ISS programme combines two previous plans to construct crewed Earth-orbiting stations: the United States' Space Station Freedom and the Soviet Union's Mir-2 .
The horizontal, or altitude-azimuth, system is based on the position of the observer on Earth, which revolves around its own axis once per sidereal day (23 hours, 56 minutes and 4.091 seconds) in relation to the star background. The positioning of a celestial object by the horizontal system varies with time, but is a useful coordinate system ...
The observable universe contains as many as an estimated 2 trillion galaxies [36] [37] [38] and, overall, as many as an estimated 10 24 stars [39] [40] – more stars (and, potentially, Earth-like planets) than all the grains of beach sand on planet Earth.
The U.S. Navy's Blue Angels Flight Demonstration Squadron switched to the F/A-18 Hornet in 1986, [18] [29] replacing the A-4 Skyhawk. The Blue Angels performed in F/A-18A, B, C, and D models at air shows and other special events across the US and worldwide before transitioning to the F/A-18E/F Super Hornet in late 2020. [ 30 ]