发射羽状物：SpaceX水母
(原标题: Launch Plume: SpaceX Jellyfish)
2026-03-19
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即使你生活在云端，你也不会经常发现像这样的水母。3月4日，SpaceX公司的猎鹰9号火箭在佛罗里达州卡纳维拉尔角发射。发射发生在日出前52分钟，第二级火箭的排气羽流在天空中足够高，可以捕捉到初升的太阳的光线，而摄影师仍然在黑暗中。这种光与影的结合，可能发生在黎明或黄昏，使得废气，主要是水蒸气和二氧化碳，看起来像一个发光的云。它只是看起来在下降，因为火箭沿着地球的曲率进入太空。一个相关的现象是暮光现象，它会导致彩色的尾迹，有时被误认为是不明飞行物。但是，如果你想知道：真正的水母在20世纪90年代被美国国家航空航天局送往太空，作为科学实验的一部分。
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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.
© Michael Seeley