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Why is the Sun's corona so much hotter than the Sun's surface? (more unsolved problems in astronomy) The temperature of the photosphere is approximately 6,000 K, whereas the temperature of the corona reaches 1,000,000–2,000,000 K. The high temperature of the corona shows that it is heated by something other than direct heat conduction from the photosphere. It is thought that the energy ...
ESPN (an abbreviation of its original name, the Entertainment and Sports Programming Network [2]) is an American international basic cable sports channel owned by The Walt Disney Company (80% and operational control) and Hearst Communications (20%) through the joint venture ESPN Inc. The company was founded in 1979 by Bill Rasmussen, Scott ...
A map of the United States showing its 50 states, federal district and five inhabited territories. Alaska, Hawaii, and the territories are shown at different scales, and the Aleutian Islands and the uninhabited northwestern Hawaiian Islands are omitted from this map. This article is part of a series on.
Development XV-15 experimental tiltrotor, 1980 Early concept illustrations of V-22 In the late 20th century VTOL aircraft gained popularity, and many prototype designs were developed, but only one entered service; the Harrier fighter/attack jet used a turbo fan engine. A practical tilt-rotor remained more elusive, until finally in the 1980s the United States moved forward with V-22 design ...
An Expanded Renewable Energy Target was passed with broad support by the Australian Parliament on 20 August 2009, to ensure that renewable energy achieves a 20% share of electricity supply in Australia by 2020. To ensure this the Federal Government committed to increasing the 2020 MRET from 9,500 gigawatt-hours to 45,000 gigawatt-hours.
Steam is injected into many oil fields where the oil is thicker and heavier than normal crude oil. This sketch illustrates steam flooding.. Steam injection is an increasingly common method of extracting heavy crude oil.
These engines feature a vertical crankshaft and the cylinders were arranged in an X pattern of four cylinder banks in four cylinder rows. These were the 16-184 and 16-338 "pancake" engines. The 16-388 engine was 13.5 feet (4.1 m) from the base of the generator to the top of the air intake filter and 4 feet (1.2 m) wide.
"In addition to these grid-based installations, there are 87,150 off-grid systems with a total installed capacity of 14.35MWP." In 2022, South Africa's shift to solar power was marked by a 24% increase in small-scale solar generating capacity.