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单词 Ariel
释义
Ariel

Astronomy
  • The fourth-largest satellite of Uranus, 1158 km in average diameter; also known as Uranus I. Ariel orbits Uranus in 2.52 days at a distance of 190 900 km, keeping the same face towards the planet. It was discovered in 1851 by W. Lassell. Ariel is an icy body, with a surface scored by giant steep-sided troughs, termed chasmata, between lightly cratered regions. The longest trough, Kachina Chasmata, is over 600 km long, and the largest crater, Yangoor, is 78 km wide. The erosion of some craters and the presence of smooth-floored material in the chasmata is evidence of volcanic or tectonic resurfacing by viscous ice flows.


Space Exploration
  • A series of six UK satellites, and Britain’s first. Launched by NASA between 1962 and 1979, these satellites made the UK the third nation, behind the US and Soviet Union, to launch a satellite successfully into space. The most significant was Ariel 5 in 1974, which made a pioneering survey of the sky's X-ray wavelengths.


Geology and Earth Sciences
  • One of the major satellites of Uranus, with a radius of 581.1 × 577.9 × 577.7 km; mass 13.53 × 1020 kg; mean density 1670 kg/m3; albedo 0.34. Surface features are visible, including fissures, craters, and flows.


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