Copyright:Michael Seeley
中文翻譯:
即使你活在雲端，也不會經常看到像這個水母一樣的景象。圖片顯示的是SpaceX的Falcon 9火箭於3月4日在佛羅里達的卡納維拉爾角發射。這次發射是在日出前52分鐘進行的，第二級火箭的排氣煙霧高達天空，捕捉到了升起的陽光，而攝影師仍處於黑暗之中。這種光與影的組合，只有在黎明或黃昏時才能看到，使得火箭的排放物（主要是水蒸氣和二氧化碳）看起來像是一朵發光的雲。這看起來是下降的，其實火箭是沿著地球的曲率向太空前進。一個相關的現象是黃昏現象，會導致五彩斑斕的飛行軌跡，偶爾會被誤認為是UFO。不過，如果你在好奇的話：真正的水母在1990年代被NASA發送到了太空，作為一個科學實驗的一部分。
原文:
ven if you live with your head in the clouds, you won’t find a jellyfish like this one very often. The featured image shows a SpaceX Falcon 9 rocket launch from Cape Canaveral in Florida on March 4. The launch happened 52 minutes before sunrise, and the second stage rocket exhaust plume was high enough in the sky to catch the light of the rising sun, while the photographer was still in the dark. This combination of light and shadow, possible at dawn or dusk, makes the exhaust, mostly water vapor and carbon dioxide, appear as a glowing cloud. It only looks like it’s going down, as the rocket follows the curvature of the Earth on its way to space. A related effect is the twilight phenomenon, which causes colorful contrails sometimes mistaken for UFOs. But, in case you are wondering: real jellyfish were sent to space by NASA in the 1990s as part of a science experiment.
來源:NASA每日圖片
