| 单词 | astronomy unit |
| 释义 | astronomy unit (extremely rare) n WORD FAMILY astronomy unit n a linear unit used for astronomical distances Hypo|Hyper light year, light-year the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers light hourthe distance light travels in a vacuum in one hour; approximately one billion kilometers light minutethe distance light travels in a vacuum in one minute; approximately 18 million kilometers light secondthe distance light travels in a vacuum in one second; approximately 300,000 kilometers AU, Astronomical Unita unit of length used for distances within the solar system; equal to the mean distance between the Earth and the Sun (approximately 93 million miles or 150 million kilometers) parsec, secpara unit of astronomical length based on the distance from Earth at which stellar parallax is 1 second of arc; equivalent to 3.262 light years linear measure, linear unit a unit of measurement of length |
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