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RL65A – Radiation-cooled power pentode up to 15 MHz, 65 W UA025A – 10 kV, 250 mA Argon-filled, half-wave rectifier with an E27 Edison screw lamp base and an anode screw top cap UA5A – 11 kV, 5 A Half-wave mercury-vapor rectifier with a 2-pin base and an anode screw top cap
The current black body temperature of the background radiation is about 2.7 K (−455 °F). [42] The gas temperatures in outer space can vary widely. For example, the temperature in the Boomerang Nebula is 1 K (−458 °F), [ 43 ] while the solar corona reaches temperatures over 1,200,000–2,600,000 K (2,200,000–4,700,000 °F).
This timeline shows the whole history of the universe, the Earth, and mankind in one table. Each row is defined in years ago, that is, years before the present date, with the earliest times at the top of the chart. In each table cell on the right, references to events or notable people are given, more or less in chronological order within the cell.
This is an accepted version of this page This is the latest accepted revision, reviewed on 18 December 2024. Problem of the lack of evidence for alien life despite its apparent likelihood This article is about the absence of clear evidence of extraterrestrial life. For a type of estimation problem, see Fermi problem. Enrico Fermi (Los Alamos 1945) The Fermi paradox is the discrepancy between ...
The Discworld is the fictional world where English writer Sir Terry Pratchett's Discworld fantasy novels take place. It consists of an interstellar planet-sized disc, which sits on the backs of four huge elephants, themselves standing on the back of a world turtle, named Great A'Tuin, as it slowly swims through space.
Roger Joseph Ebert (/ ˈ iː b ər t / EE-burt; June 18, 1942 – April 4, 2013) was an American film critic, film historian, journalist, essayist, screenwriter and author.He was the film critic for the Chicago Sun-Times from 1967 until his death in 2013.
Due to the influence of solar radiation, monsoon circulation and geographical factors, Shanxi's climate has four distinct seasons, synchronous rain and heat, sufficient sunshine, significant climate difference between north and south, wide temperature difference between winter and summer, and large temperature difference between day and night.