Heating A Ball Just By Squeezing It
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This is because Io, Europa, and Ganymede are all in orbital resonance.
这是因为木卫一、木卫二和木卫三都处于轨道共振中。
Each time Ganymede completes one orbit, Europa completes two, and Io four.
木卫三每绕行一圈，木卫二绕行两圈，木卫一则绕行四圈。
Because of that, Io tugs Europa inward on one side of the orbit, while Ganymede pulls it out on the other, making its orbit more eccentric.
正因如此，木卫一在轨道的一侧将木卫二向内拉扯，而木卫三在另一侧将其向外拉扯，使其轨道变得更加偏心。
Now, Jupiter's pull is stronger on the closer side of the orbit than on the farther side, so Europa is constantly being stretched and squeezed, stretched and squeezed.
木星在轨道近侧的引力比远侧更强，因此木卫二不断地被拉伸和挤压，拉伸和挤压。
You can see how this rubber ball gets warmer as I squeeze it.
你可以看到当我挤压这个橡胶球时，它是如何变热的。
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