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原文:
Where do comet tails come from? Although it is common knowledge that comet tails and comas originate from comet nuclei, exactly how that happens is an active topic of research. One of the best images yet of emerging jets is shown in the featured image, taken last November by the robotic Rosetta spacecraft in orbit around the Comet 67P/Churyumov-Gerasimenko (Comet CG), and released last month. The overexposed picture shows plumes of gas and dust escaping numerous places from the Comet CG’s nucleus as it nears the Sun and heats up. Although Comet CG is currently further out from the Sun than Mars, its orbit will take it almost as close as the Earth this coming August, at which time its jet activity is expected to increase by a factor of about 100. You’ve likely seen some debris from comet nuclei before but in another form — when sand-sized bits end their journey through the Solar System by impacting the atmosphere of Earth as meteors. Almost Hyperspace: Random APOD Generator
中文翻譯:
💫 尖端科學探索：彗星的尾巴來自於哪裡？彗星尾巴與彗髮的形成過程仍然是活躍的研究課題。去年的11月，由機械人太空船Rosetta拍攝的嶄新圖像顯示出彗星67P/屈留莫夫-赫拉西門科（Comet CG）表面冒出的氣體和塵埃噴流。隨著彗星靠近太陽，溫度上升，這些噴流從彗星的核裂出，不同的噴口逐漸出現。
雖然目前彗星CG的軌道位置在火星之遠，但預計在今年8月時將近地球，屆時其噴發活動將增加約100倍！您可能曾經在另一種形式上見過彗星核的碎片——當沙粒大小的物質穿過地球大氣層並以流星的形式結束它們的旅行。
#彗星 #太空探索 #Rosetta #68P核 #噴流 #科學 #宇宙 #流星 #科學研究 #天文學 #太陽系 #探索未知
來源:NASA每日圖片
