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天文学家首度确认海王星存在极光现象

2025-03-29 22:09 by 通灵师

天文学家首度确认海王星上存在极光现象,由 NASA 韦伯太空望远镜所发现,补上了太阳系四颗巨行星极光观测的最后一块拼图。这也是我们首次直接捕捉到这颗最远行星的极光辉光与光谱特征。海王星位于太阳系边缘,距离太阳约45亿公里,是一颗冰冷巨行星。自 1989 年航海家二号飞掠海王星后,这颗遥远行星便再无太空船造访。如今韦伯太空望远镜首度捕捉到海王星上明亮的极光活动。这项突破得益于韦伯望远镜优异的近红外灵敏度,不仅能拍下极光发出的辉光,还能透过光谱清楚辨识代表极光活动的重要指标:三氢阳离子(H₃⁺)。这种离子也曾在木星、土星与天王星的极光中被侦测到,被视为气体行星极光的重要证据。与地球或木星不同,海王星的极光并不集中于南北极,而是分布在行星的中纬度地区。这是因为海王星具有异常倾斜的磁场结构,其磁轴与自转轴倾斜达 47 度,这一特征最早由航海家二号所发现。

天文館:首度捕捉到海王星極光
NASA's Webb Captures Neptune's Auroras For First Time

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天文学家首度确认海王星存在极光现象

2025-03-29 22:09 by 通灵师

天文学家首度确认海王星上存在极光现象,由 NASA 韦伯太空望远镜所发现,补上了太阳系四颗巨行星极光观测的最后一块拼图。这也是我们首次直接捕捉到这颗最远行星的极光辉光与光谱特征。海王星位于太阳系边缘,距离太阳约45亿公里,是一颗冰冷巨行星。自 1989 年航海家二号飞掠海王星后,这颗遥远行星便再无太空船造访。如今韦伯太空望远镜首度捕捉到海王星上明亮的极光活动。这项突破得益于韦伯望远镜优异的近红外灵敏度,不仅能拍下极光发出的辉光,还能透过光谱清楚辨识代表极光活动的重要指标:三氢阳离子(H₃⁺)。这种离子也曾在木星、土星与天王星的极光中被侦测到,被视为气体行星极光的重要证据。与地球或木星不同,海王星的极光并不集中于南北极,而是分布在行星的中纬度地区。这是因为海王星具有异常倾斜的磁场结构,其磁轴与自转轴倾斜达 47 度,这一特征最早由航海家二号所发现。

天文館:首度捕捉到海王星極光
NASA's Webb Captures Neptune's Auroras For First Time

#太空

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The lead from Wall Street offers little clarity as the major averages opened lower on Friday and then bounced back and forth across the unchanged line, finally finishing mixed and little changed.The Dow added 33.18 points or 0.10 percent to finish at 34,798.00, while the NASDAQ eased 4.54 points or 0.03 percent to close at 15,047.70 and the S&P 500 rose 6.50 points or 0.15 percent to end at 4,455.48. For the week, the Dow rose 0.6 percent, the NASDAQ added 0.1 percent and the S&P gained 0.5 percent.The lackluster performance on Wall Street came on uncertainty about the outlook for the markets following recent volatility.

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Telegram has made it easier for its users to communicate, as it has introduced a feature that allows more than 200,000 users in a group chat. However, if the users in a group chat move past 200,000, it changes into "Broadcast Group", but the feature comes with a restriction. Groups with close to 200k members can be converted to a Broadcast Group that allows unlimited members. Only admins can post in Broadcast Groups, but everyone can read along and participate in group Voice Chats," Telegram added.

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