| 单词 | asteroid |
| 释义 | asteroid (once / 2973 pages) 1n 2adj An asteroid is a large, irregularly shaped object in space that orbits our Sun. If one of these giant rocks ends up on a collision course with Earth, we are in for big trouble. An asteroid is like a comet. However, while comets are mostly made of ice, asteroids are made up of rock or even metal. This makes them dangerous because they can cause a lot of damage if they collide with a planet. The craters on the Moon were formed by asteroids and some think it was an asteroid that wiped out the dinosaurs. Around a million asteroids are located between Mars and Jupiter in an area called the “asteroid belt.” WORD FAMILYasteroid: asteroidal, asteroids USAGE EXAMPLESWhen the asteroid hit, “dinosaurs were basically caught holding bad cards—a dead man’s hand,” Erickson says. Science Magazine(Jan 02, 2017) Unlike the path of an asteroid, whose motion is determined by the relatively simple laws of gravitational mechanics, climate is horribly complex. Slate(Dec 26, 2016) This allowed a team led by Thomas Prettyman at the Planetary Science Institute in Tucson, Arizona, to measure hydrogen at the asteroid's surface. Nature(Dec 20, 2016) 1 n any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter) 2Exp|Hypo|Hyper Apollo asteroid an asteroid whose orbit crosses the Earth's orbit Ceresthe largest asteroid and the first discovered Pallasa large asteroid; the second asteroid to be discovered Vestathe brightest asteroid but the fourth to be discovered Chiron an asteroid discovered in 1977; it is unique in having an orbit lying mainly between the orbits of Saturn and Uranus minor planet, planetoid any of numerous small celestial bodies that move around the sun adj shaped like a star Syn star-shaped angular, angulate having angles or an angular shape |
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