At the image top, over Io's limb, a bluish plume rises about 140 kilometers above the surface of a volcanic caldera known as Pillan Patera.

在这张照片的顶部，木卫一的表面上升起了一道大约140千米高的青烟，它从名为Pillan Patera的火山口喷发而出。

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The curvature of the Earth’s horizon (the limb) is clearly visible, as is the faint blue line of the upper atmosphere directly above it (at image top center).

地球地平线的曲线（周边）清晰可见，它的正上方隐约显现出高层大气的蓝线（图片中上部）。

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The curvature of the Earth's horizon (the limb) is clearly visible, as is the faint blue line of the upper atmosphere directly above it (at image top center).

地球地平线的曲线(周边)清晰可见，它的正上方隐约显现出高层大气的蓝线(图片中上部)。

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