韦伯拍摄的红外线木星和土星环
(原标题: Jupiter and Ring in Infrared from Webb)
2022-07-20
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为什么木星有光环？1979年，美国宇航局的旅行者1号探测器发现了木星的主环，但它的起源在当时还是个谜。然而，从1995年到2003年环绕木星运行的美国宇航局伽利略号宇宙飞船的数据证实了这个光环是由流星体撞击附近的小卫星造成的假设。例如，当一个小流星体撞击微小的梅蒂斯时，它会钻进月球，蒸发，并将灰尘和灰尘爆炸到木星轨道上。詹姆斯·韦伯太空望远镜在红外光下拍摄的木星特色图像不仅显示了木星和它的云，还显示了这枚戒指。同样可见的是木星的大红斑（GRS）——在右边是相对较浅的颜色，木星的大卫星木卫二——在左边衍射峰的中心，木卫二的阴影——在GRS旁边。图像中的几个特征还没有被很好地理解，包括木星右翼上看似分离的云层。《天体惊喜》：APOD在你生日那天给你拍了什么照片？(1995后)
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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)