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哈雷彗星是轨道周期约为76.1年的太阳系的一个成员.彗核半径估计为15公里.严格地说,它算不上是一颗星,其主要组成部分是许多象流星体那样的石块,石块之间充满着水粒、气体和宇宙尘埃.它的庞大体积和有利的轨道位置(近日点在太阳和地球轨道的半中间)使其每次接近近日点时都能被肉眼看到.当它接近太阳的时候,还往往在背太阳的一面伸出一条长长的尾巴.自公元前1056年以来,哈雷彗星的多次出现,在我国丰富的史料中都留下了珍贵的记载.欧洲对哈雷彗星的观测记载被认为最早是在公元前11年,落后于中国一千年.据推算,下次将在1986年2月出现.
Halley’s comet is a member of the solar system with an orbital period of about 76.1 years, and the radius of the comet nucleus is estimated to be 15 km. Strictly speaking, it is not a star, its main component is a lot of stones like meteoroid, The stones are filled with water particles, gas and cosmic dust, and its large size and favorable orbital position (recently halfway between the sun and the Earth’s orbit) make it visible to the naked eye each time it approaches the perihelion. When it Close to the sun, often in the back side of the sun stretched out a long tail.Every time since come into existence in 1056, the comet Halley, in our rich historical data have left a precious record.European Harley Observational records of comets are considered as early as 11 BC and lag behind China for a thousand years, and it is estimated that the next will appear in February 1986.