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原文:
Two hours before closest approach to Neptune in 1989, the Voyager 2 robot spacecraft snapped this picture. Clearly visible for the first time were long light-colored cirrus-type clouds floating high in Neptune’s atmosphere. Shadows of these clouds can even be seen on lower cloud decks. Most of Neptune’s atmosphere is made of hydrogen and helium, which is invisible. Neptune’s blue color therefore comes from smaller amounts of atmospheric methane, which preferentially absorbs red light. Neptune has the fastest winds in the Solar System, with gusts reaching 2000 kilometers per hour. Speculation holds that diamonds may be created in the dense hot conditions that exist under the cloud tops of Uranus and Neptune. Twenty-six years later, NASA’s New Horizons is poised to be the first spacecraft to zoom past Pluto this July. Almost Hyperspace: Random APOD Generator
中文翻譯:
🌌 在1989年,旅行者2號(Voyager 2)在接近海王星(Neptune)兩小時前拍下的這張照片中,長長的淺色卷雲首次清晰可見。甚至能在較低的雲層上看到這些雲的影子。海王星的大氣主要由氫(Hydrogen)和氦(Helium)組成,這些氣體是無法被觀察到的。海王星的藍色因此源於其大氣中稍微存在的甲烷(Methane),這種氣體會優先吸收紅光。海王星擁有太陽系中最快的風,強風可達每小時2000公里。有推測認為,在海王星和天王星(Uranus)雲頂下的高密度、高溫條件下,可能會形成鑽石。26年後,NASA的新視野號(New Horizons)將於今年七月首次探測冥王星(Pluto)。
#海王星 #旅行者2號 #NASA #新視野號 #冥王星 #太陽系 #太空探索 #雲層 #科學 #宇宙
來源:NASA每日圖片