美國火星探測器「毅力」號近日傳回一張在火星拍攝的照片,相中疑似出現彩虹,引起廣泛討論。美國太空總署(NASA)周三(7日)在Twitter表示,火星應該不會出現彩虹,相中所見的並非彩虹,而是鏡頭光暈。
NASA解釋稱,彩虹是陽光照射到半空中水滴折射而成,但火星大氣中水分太少,因此火星應該不會出現彩虹。NASA太陽系探索計劃執行主管Dave Lavery受訪時,同意相中所見的是鏡頭光暈,「這絕對不是彩虹,只是相機鏡頭內部反射而已」。
(NASA毅力號Twitter/The Hill/福布斯)
Many have asked: Is that a rainbow on Mars? No. Rainbows aren't possible here. Rainbows are created by light reflected off of round water droplets, but there isn't enough water here to condense, and it’s too cold for liquid water in the atmosphere. This arc is a lens flare. pic.twitter.com/mIoSSuilJW
— NASA's Perseverance Mars Rover (@NASAPersevere) April 6, 2021
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