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题目材料：
Researchers suspect that meteorites (particles of matter that fall to Earth' s surface from space) are pieces of asteroids, the many minor planets primarily inhabiting the region between Mars and Jupiter called the asteroid belt. The most common meteorites are ordinary chondrites-rocks containing tiny flecks of metal. By analyzing the spectrums of sunlight reflected by asteroids to determine the asteroids' chemical composition, researchers have found that most of the brighter asteroids contain the same silicates and other compounds that dominate chondrites. These silicaceous, or S-type, asteroids are the most abundant type in the inner asteroid belt, the part of the asteroid belt from which objects are most likely to escape and travel to Earth. However, S-type asteroids reflect red and infrared light much better than they reflect green, blue, and violet light, suggesting that they have a higher metal content than do ordinary chondrites. This has led at least one researcher to posit that meteorites come from other types of asteroids that are too small and too dim to be detected. However, S-type asteroids could be ordinary chondrites that have been weathered by the effects of the space environment, making them seem redder and more metallic than they really are.
以上解析由 考满分老师提供。
