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2001年11月19日凌晨,在天文史上赫赫有名的狮子座流星雨如期而至,每小时几千颗甚至上万颗流星划过夜空。目睹这一奇观的人们也许要问,流星雨究竟是从哪里来的呢? 我们知道,在太阳系中,除了九大行星和它们的卫星之外,还有彗星、小行星以及一些更小的天体,在围绕太阳公转。彗星的主要部分是低温物质结成的空间“冰雪球”,在接近太阳的时候,由于太阳辐射的作用,“冰雪球”可能部分地升华或瓦解、碎
In the early morning of November 19, 2001, the famous Leonid meteor shower in the history of astronomy arrived on schedule, with thousands or even tens of thousands of meteors flying every night. People who have witnessed this spectacle may have to ask, where did the meteor shower come from? We know that in the solar system, in addition to the nine planets and their moons, there are comets, asteroids, and some smaller objects. In orbit around the sun. The main part of the comet is the space “ice ball” formed by the low-temperature material. When it approaches the sun, the “ice ball” may partially sublimate or disintegrate or break due to solar radiation.