| 单词 |
micrometeoroid |
| 释义 |
micrometeoroid|maɪkrəʊˈmiːtɪərɔɪd|
[f. micro- 1 + meteoroid n.]
A solid particle in space, or of extraterrestrial origin, which is small enough to survive entry into the earth's atmosphere. Cf. prec.
1954Mineral. Abstr. XII. 242 There may be ‘micrometeorites’ (? micrometeoroids..) too small to suffer ablation and falling as cosmic dust. 1961Daily Tel. 26 Aug. 1/4 Another earth satellite, Explorer 13, was put into orbit to-day. It will measure dust-like particles in space known as micrometeoroids. 1968Awake! 22 Sept. 30/2 The suit will be made to protect the astronaut..from tiny particles known as micrometeoroids. 1973[see prec.]. 1974Nature 6 Sept. 17/1 It sent back more than 300 pictures of Jupiter, as well as measurements of magnetic fields, energetic particles,..and micrometeoroids.
Hence ˌmicrometeoˈroidal a.
1972Science 2 June 979/2 The scale of hypervelocity impact craters. on the moon extends down to submillimeter and submicron micrometeoroidal pits on rock surfaces. |
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