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Damn good catch kz! I do get a lot of images from the Astronomy Pic of the Day but had missed that one somehow.
One thing I still don't understand. That writeup says the heat of Io is due to the tidal gravity stretching it. I can see how it would stretch it, but wouldn't the stretching just get to some point and then stop?
Is Io different from the Moon in that it doesn't always face one side towards the planet?
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