2025年5月25日
Beneath Jupiter
Image Credit & Copyright: NASA, Juno, SwRI, MSSS; Processing & License: Gerald Eichstädt & Seán Doran
Explanation: Jupiter is stranger than we knew. NASA’s Juno spacecraft has now completed over 70 swoops past Jupiter as it moves around its highly elliptical orbit. Pictured from 2017, Jupiter is seen from below where, surprisingly, the horizontal bands that cover most of the planet disappear into swirls and complex patterns. A line of white oval clouds is visible nearer to the equator. Impressive results from Juno show that Jupiter’s weather phenomena can extend deep below its cloud tops, that Jupiter‘s center has a core that is unexpectedly large and soft, and that Jupiter’s magnetic field varies greatly with location. Although Juno is scheduled to keep orbiting Jupiter further into 2025, at some time the robotic spacecraft will be maneuvered to plunge into the giant planet.
Jigsaw Jumble: Astronomy Puzzle of the Day
Tomorrow’s picture: galaxy spikes
木星的底部
影像提供与版权: NASA, Juno, SwRI, MSSS; 影像处理与授权: Gerald Eichstädt & Seán Doran
说明: 木星比我们所知的还要怪异。以高度椭圆轨道绕行木星的美国国家航空航天局朱诺号探测器，已完成了70多次飞越木星。上面这幅摄于2017年的影像，呈现了从下方仰视木星所见到的景观，其中最令人惊讶的，是涵盖大部分木星的水平云带，转变成涡旋云和其他形状复杂的云。此外，在赤道附近还可见到串珠状的椭圆白斑。朱诺号最重要的观测结果显示，木星的天气现象可深入到云层内部，其核心则意外的大且柔软，而且木星的磁场随位置而有大幅度的变化。虽然在2025年，朱诺号还会持续绕行木星，但在今年的某个待定时刻，它会接获指令舍身跃入这颗巨行星之内。
拼图游戏: 今日天文学谜题
明日的图片: galaxy spikes
