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asteroid    音标拼音: ['æstɚ,ɔɪd]
n. 小游星,小行星,海盘车
a. 星状的

小游星,小行星,海盘车星状的

asteroid
adj 1: shaped like a star [synonym: {asteroid}, {star-shaped}]
n 1: any of numerous small celestial bodies composed of rock and
metal that move around the sun (mainly between the orbits
of Mars and Jupiter)

Asteroid \As"ter*oid\, n. [Gr. ? starlike, starry; 'asth`r star
e'i^dos form: cf. F. ast['e]ro["i]de. See {Aster}.]
A starlike body; esp. one of the numerous small planets whose
orbits lie between those of Mars and Jupiter; -- called also
{planetoids} and {minor planets}.
[1913 Webster]


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  • Asteroid - Wikipedia
    An asteroid is a minor planet —an object larger than a meteoroid that is neither a planet nor an identified comet —that orbits within the inner Solar System or is co-orbital with Jupiter (Trojan asteroids)
  • Asteroids - Science@NASA
    Asteroids, sometimes called minor planets, are rocky, airless remnants left over from the early formation of our solar system about 4 6 billion years ago Most asteroids can be found orbiting the Sun between Mars and Jupiter within the main asteroid belt
  • Eyes on Asteroids - NASA JPL
    Explore the 3D world of Asteroids, Comets and NEOs Learn about past and future missions, tracking and predicting orbits, and close approaches to Earth
  • Asteroid | Definition, Size, Facts | Britannica
    Asteroid, any of a host of small bodies, about 1,000 km (600 miles) or less in diameter, that orbit the Sun primarily between the orbits of Mars and Jupiter in a nearly flat ring called the asteroid belt Hundreds of thousands of asteroids are known
  • Asteroid on collision course with moon could fire shrapnel at Earth
    The asteroid 2024 YR4, which was once thought to be on a collision course with Earth, may still pose a threat to the planet There is still a chance the space rock could smash into the moon, and
  • What Is an Asteroid? | NASA Space Place – NASA Science for Kids
    Asteroids are small, rocky objects that orbit the sun Although asteroids orbit the sun like planets, they are much smaller than planets A close-up image of the asteroid Ida taken by NASA's Galileo spacecraft Image credit: NASA JPL-Caltech UCLA MPS DLR IDA There are lots of asteroids in our solar system
  • In Depth | Asteroids - NASA Solar System Exploration
    Asteroids, sometimes called minor planets, are rocky remnants left over from the early formation of our solar system about 4 6 billion years ago The current known asteroid count is: Most of this ancient space rubble can be found orbiting our Sun between Mars and Jupiter within the main asteroid belt
  • Asteroid Fast Facts - NASA
    About once a year, an automobile-sized asteroid hits Earth’s atmosphere, creates an impressive fireball, and burns up before reaching the surface Every 2,000 years or so, a meteoroid the size of a football field hits Earth and causes significant damage to the area
  • James Webb telescope ups the odds that city-killer asteroid 2024 YR4 . . .
    The James Webb Space Telescope has taken another look at the potential "city-killer" asteroid 2024 YR4 and found its chances of hitting the moon in December 2032 have increased to 4 3%
  • City-killer asteroid hurtling toward moon — this is the terrifying . . .
    Wiegert estimated that the asteroid would hit the Moon at 29,000 mph, creating a blast crater 0 6 miles wide, making it the largest lunar impact in the last 5,000 years





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