谁能给我个UFO的英文简介 也要中文

谁能给我个UFO的英文简介 也要中文

An unidentified flying object (usually abbreviated to UFO or U.F.O.) is any unusual apparent object or phenomenon in the sky whose cause cannot be identified by the observer,or (in a narrower definition) by investigators; though in popular usage it more loosely means alien spacecraft,being one explanation (among several) offered for such sightings.Though UFO sightings have occurred throughout history,modern interest in them dates from World War II,since when governments have investigated UFO reports,often from a military perspective,and UFO researchers have investigated,written about and created organizations devoted to the subject.
Studies have established that the majority of UFOs are observations of some real but conventional object—most commonly aircraft,balloons,noctilucent clouds,nacreous clouds,or astronomical objects such as meteors or bright planets — that have been misidentified by the observer as anomalies,while a small percentage of reported UFOs are hoaxes.However,after excluding these incorrect reports,between 5% and 20% of the total remain unexplained,and so can be classified as unidentified in the strictest sense.Many such reports have been made by trained observers such as pilots,police and the military; some involve radar traces,so not all reports are visual.Proponents of an extraterrestrial hypothesis believe that these unidentified reports are of alien spacecraft,though various other hypotheses have been proposed.
无法立即向观测者解释清楚的空中物体或光学现象.第二次世界大战以后,随着航空航天事业的发展,人们对不明飞行物的关注倍增.20世纪50年代一个调查异常现象的美国政府科学小组报告,不明飞行物中有90％是天文或气候现象,或者看到的是飞机、鸟类或热气,有时则是由于异常的天气条件造成的.有些现象仍然无法解释,在20世纪 60年代中期,个别科学家认为少数报告显示有天外来客的出现.这种耸人听闻的假说在报刊发表后,立即遭到其他科学家的反对.始于1968年的美国空军不明飞行物研究报告坚决摒弃天外来客说,但美国大部分公众和少数科学家仍然支持此种假说.不明飞行物报告在可靠性方面有很大差别.肉眼很容易产生错觉,雷达对不明飞行物的探测虽然在某些方面较为可靠,但可能无法将有形物体与流星余迹、雨水或热跃变的径迹区分开,并且还会受到电波干扰.