2022年7月20日


特色图像显示了詹姆斯韦伯太空望远镜拍摄的红外光木星。可见的是云、大红斑——颜色看起来很浅——以及围绕着这颗巨大行星的一个显著的环。请参阅说明以获取更多详细信息。

Jupiter and Ring in Infrared from Webb
Image Credit:
NASA, ESA, CSA, STScI; Processing & License: Judy Schmidt

Explanation: Why does Jupiter have rings? Jupiter’s main ring was discovered in 1979 by NASA’s passing Voyager 1 spacecraft, but its origin was then a mystery. Data from NASA’s Galileo spacecraft that orbited Jupiter from 1995 to 2003, however, confirmed the hypothesis that this ring was created by meteoroid impacts on small nearby moons. As a small meteoroid strikes tiny Metis, for example, it will bore into the moon, vaporize, and explode dirt and dust off into a Jovian orbit. The featured image of Jupiter in infrared light by the James Webb Space Telescope shows not only Jupiter and its clouds, but this ring as well. Also visible is Jupiter’s Great Red Spot (GRS) — in comparatively light color on the right, Jupiter’s large moon Europa — in the center of diffraction spikes on the left, and Europa’s shadow — next to the GRS. Several features in the image are not yet well understood, including the seemingly separated cloud layer on Jupiter’s right limb.

Celestial Surprise: What picture did APOD feature on your birthday? (post 1995)

Tomorrow’s picture: open space


韦伯: 木星与木星环的红外光图像
图像提供:
NASA, ESA, CSA, STScI; 图像处理与授权: Judy Schmidt

说明: 为何木星有行星环呢?旅行者1号宇宙飞船于1979年路过木星之时,发现了木星的主环,然而在当时它的起源是个谜。后来从1995年到2003年之间绕行木星的伽利略号宇宙飞船回传的数据中,方才确认这道环是因为流星体撞击行星环附近的小卫星所产生。例如:当小流星体撞击娇小的木卫十六(Metis)时,会在穿透卫星表面后才汽化爆炸,将土和尘埃扬入绕行木星的轨道里。这幅由韦伯太空望远镜摄于红外光波段的木星主题图像,除了呈现木星及其云层之外,更记录了这道明亮的行星环。在图像里,还可见右侧以淡斑之姿现身的木星大红斑(GRS)、木星的大卫星木卫二(左侧衍射芒的中心)、及大红斑左方的木卫二之暗影。图像里还有数个尚未全然了解的特征,其中包括木星右侧邻边上看似分离的云层。

天体惊喜: 你生日那天APOD拍了什么照片?(1995年后)

明日的图片: open space

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