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A light blue spiral appeared in the night sky on April 15 among the northern lights, fueling people’s interest in unidentified flying objects (UFOs). However, this time the science behind the event was simple.

4月15日，夜空的北極光中出現了淺藍色螺旋形物體，這引起了人們對不明飛行物的好奇。其實，這一事件背后的科學原理很簡單。

 

The cause of the spiral was the fuel released from the SpaceX rocket that had been launched from California, US, about three hours before the spiral appeared, reported The Guardian. It was just a cloud of frozen fuel in the sky. It’s also the third spiral, as similar shapes were observed in June 2022 and January this year, both after the launch of SpaceX rockets, according to the Space Weather website.

據《衛(wèi)報》報道，在美國加利福尼亞州出現螺旋約三個小時前，SpaceX火箭發(fā)射升空，其釋放的燃料導致螺旋的形成。人們看到的藍色螺旋物體，其實只是天空中的一團由冰凍燃料形成的云。據“空間天氣（Space Weather）”網站報道，2022年6月和今年1月，在SpaceX 火箭發(fā)射后，人們都觀察到了類似的形狀，這已經是第三次了。

 

On April 16, people in Shandong province observed a green object with a long golden tail flying across the sky. Qingdao Aishan Observatory confirmed later that it was a piece of meteor. “Even the aliens are coming for the local barbecue,” an internet user joked as barbecue in Zibo, Shandong, has recently become popular.

4月16日，我國山東省民眾觀測到一個帶著一條長長金色尾巴的綠色物體飛過天空。青島艾山天文臺后來證實那是一顆流星。一位網友調侃說：“甚至外星人都來吃淄博燒烤了”。那時，山東淄博燒烤火爆全網。

 

Strange sights in the sky never cease to attract people’s interest. So what else could the “UFOs” we see in the sky be? People may believe that they have seen a UFO right before sunrise or after sunset. The “UFO” may be glowing and climbing, as if it’s getting out of Earth’s atmosphere. However, they may be just airplanes. At those times, the sky is dusky when observed from Earth, but high in the sky, there is still light that shines on the aircraft, which is why it’s glowing. Also, the shape of the airplane isn’t clear when it’s climbing, leading to confusion among observers.

天空中的奇怪景象總會引發(fā)人類的好奇。那么，我們在天空中看到的“不明飛行物”還可能是什么呢？在日出前或日落后，經常有人觀測到所謂的“不明飛行物”。該物體可能一邊發(fā)光一邊緩緩升空，仿佛正在脫離地球大氣層。然而，其實可能只是飛機。因為在這些時刻，從地球上看，天空是昏暗的，但在高空中，依然有光線照射在飛機上，所以它才會發(fā)光。此外，當飛機在上升時，其形狀并不清晰，導致觀測到的人產生誤解。

 

Something else that can shine strangely in the sky is a noctilucent cloud, which can be mistaken as a UFO.  Usually appearing after sunset, these clouds are formed when the temperature in the atmosphere is at its lowest. Due to the high altitude, water vapor can freeze into clouds of ice crystals, which then reflect the sunlight. The reflected sunlight can reach out toward the edge of space, according to the Space website.

在天空中還可能觀測到另一種能夠奇異發(fā)光的物體——夜光云，它有時候也被誤認為是“不明飛行物”。夜光云通常在日落后出現，其在大氣溫度最低的時候形成。高海拔讓水蒸氣凝結成冰晶云，然后反射陽光。“太空（Space）”網站介紹，這些反射的陽光可以延伸至太空邊緣。

 

Sometimes, when you take a picture of the night sky in the city, weird lighted objects may appear in the picture – but you can’t see them in the sky! The “objects” are actually reflections of other lighted things, such as a lamp or street lights. The camera on smartphones usually has several layers of glass – for example, the camera on iPhone 12 has seven layers. The light goes through these layers before reaching the sensor which controls when the picture is taken. 

有時候，在城市里拍攝夜空，照片中可能會出現奇怪的發(fā)光物體，但肉眼卻無法觀測到！這些“物體”實際上是其他發(fā)光物體反射的光，比如街上的燈光。智能手機上的攝像頭通常有幾層玻璃，例如iPhone 12上的攝像頭就有七層。光線在到達傳感器之前會穿過這些玻璃層。

 

In the 1940s and 50s, reports of “flying saucers” became a cultural phenomenon in the US. Sightings of strange objects in the sky became material for Hollywood and UFOs were a frequent topic in movies. This is partly why people usually think a UFO is a disk-shaped object. However, modern sci-fi movies show different types of alien spaceships.

在20世紀40年代和50年代，關于“飛碟”的報道在美國成為了一種文化現象。天空中奇怪物體的目擊成為了好萊塢素材，UFO在電影中也成為了一個頻繁出現的話題。這也是人們通常認為UFO是圓盤狀物體的部分原因。然而，現代科幻電影也展示了不同類型的外星飛船。

 

What is your impression of a UFO? If aliens were real, what would they visit Earth for?
你對UFO有什么印象？如果外星人是真實存在的，你覺得他們?yōu)槭裁磿L問地球？
 

以上文章內容選自《21世紀學生英文報》高二908期