英语词汇“astronomical unit”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

astronomical unit

(abbreviation AU)

noun Astronomy

A unit of measurement equal to 149.6 million kilometres, the mean distance from the centre of the earth to the centre of the sun.Bodies that formed from the Sun out to a distance of about 2.5 astronomical units are primarily rocky and metallic....

Typical distances from the Sun are 10,000 astronomical units, and typical orbital periods are on the order of 1 million years.
Today the distance between the Earth and sun, known as an astronomical unit, is accurately measured by radar.

单词	astronomical unit
释义	astronomical unit (abbreviation AU) noun Astronomy A unit of measurement equal to 149.6 million kilometres, the mean distance from the centre of the earth to the centre of the sun.Bodies that formed from the Sun out to a distance of about 2.5 astronomical units are primarily rocky and metallic.... Typical distances from the Sun are 10,000 astronomical units, and typical orbital periods are on the order of 1 million years. Today the distance between the Earth and sun, known as an astronomical unit, is accurately measured by radar.
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