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The propulsion system for the descent stage of the lunar module was designed to transfer the vehicle, containing two crewmen, from a 60-nautical-mile (110 km) circular lunar parking orbit to an elliptical descent orbit with a pericynthion of 50,000 feet (15,000 m), then provide a powered descent to the lunar surface, with hover time above the lunar surface to select the exact landing site.
The least stable is 10 He, with half-life 260(40) yoctoseconds (2.6(4) × 10 −22 s), though 2 He may have an even shorter half-life. In Earth's atmosphere, the ratio of 3 He to 4 He is 1.343(13) × 10 −6. [5] However, the isotopic abundance of helium varies greatly depending on its origin.
From a cross-project redirect: This is a redirect from a title linked to an item on Wikidata.The Wikidata item linked to this page is helium-10 (Q12624964).. Use this template only on hard redirects – for soft redirects use {{Soft redirect with Wikidata item}}.
Each atom of helium-4 is a boson particle, by virtue of its integer spin. A helium-3 atom is a fermion particle; it can form bosons only by pairing with another particle like itself, which occurs at much lower temperatures. The discovery of superfluidity in helium-3 was the basis for the award of the 1996 Nobel Prize in Physics. [1]
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HTR-10 is a pebble-bed high-temperature gas reactor utilizing spherical fuel elements with ceramic coated fuel particles. The reactor core has a diameter of 1.8 metres (5 ft 11 in), a mean height of 1.97 metres (6 ft 6 in) and the volume of 5.0 cubic metres (180 cu ft), and is surrounded by graphite reflectors .
Major contributions of this period are the study of the evaporation mechanism of helium clusters [3] and the T=0 extension of the Hohenberg-Mermin-Wagner theorem. [ 4 ] His interests in the physics of Bose-Einstein condensates (BEC) started with the workshop on Bose-Einstein Condensation (BEC), known as the "Levico conference", organized in ...
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