| 单词 | meteoroid |
| 释义 | meteoroid (once / 179081 pages) n A meteoroid is a small space rock moving through a solar system. Space is full of meteoroids. Most meteoroids are small, the size of pebbles or dust from a comet’s tail, but they can also be quite large. They’re all chunks off of something bigger, sometimes even the moon or Mars! If a meteoroid enters the Earth’s atmosphere, it’s called a meteor, or shooting star. If part of that meteor survives the trip through the atmosphere and hits the Earth, it’s a meteorite. A lot of meteoroids never end up being meteors or meteorites. WORD FAMILYmeteoroid: meteoroids+/meteor: meteoric, meteoroid, meteors, micrometeor/meteoric: meteorically/micrometeor: micrometeoric, micrometeoroid/micrometeoroid: micrometeoroids USAGE EXAMPLES"Under perfect conditions, rates could soar to 200 meteors per hour," Bill Cooke with NASA’s Meteoroid Environments Office, said in a statement. The Verge(Aug 09, 2016) Some 3.4 billion years ago, giant meteoroids slammed into a frigid ocean covering Mars's northern hemisphere. Nature(May 18, 2016) “This year’s not a good viewing time for Lyrids,” said Bill Cooke, an astronomer with NASA’s Meteoroid Environment Office. New York Times(Apr 18, 2016) n (astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere Syn|Hypo|Hyper meteor meteorite stony or metallic object that is the remains of a meteoroid that has reached the earth's surface meteor swarma group of meteoroids with similar paths aerolitea stony meteorite consisting of silicate minerals micrometeor, micrometeorite, micrometeoroida meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere pallasitea meteorite composed principally of olivine and metallic iron sideritea meteorite consisting principally of nickel and iron estraterrestrial body, extraterrestrial object a natural object existing outside the earth and outside the earth's atmosphere |
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