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Unit 4 Astronomy：the science of the stars 你接受了一项写作任务，要为英语校报写一篇有关UFO的文章。 请根据以下信息，简要介绍UFO。 名称简介 UFO是Unidentified Flying Object 的缩写 世界十大未解之谜之一 有关事件 首次目击报告是在1878年的美国 从那以后目击报告层出不穷，有许多是虚假的 人们的看法 来自其他行星的太空飞船 一种自然现象 外星人 研究状况 三分之一的国家对UFO展开研究 大量关于UFO的图书和期刊出版 有些大学开设UFO课程 外星人 alien 精彩美文 UFO, which is short for Unidentified Flying Object, has long been regarded as one of the top 10 unsolved mysteries in the world. The first UFO sighting was reported to have happened in America in 1878. Since then, numerous sightings have been reported all over the world, many of which turned out to be false. Some people think UFOs are spaceships from other planets, others believe that they're just a kind of natural phenomenon and still others guess they're aliens. Now about one third of the countries in the world are doing research on UFOs, about which many books and journals have been published, and in some universities courses are even set up to study UFOs. | 
