Quote:
Originally Posted by tusenfem
Did you actually read the stuff you link to? The expansion phase was during a limited period when Ganymede was in its differentiation period, i.e. the creation of a metal core, a rocky mantle and an ice/water outer layer.
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Clearly it's you who have reading comprehension difficulties.
"
Researchers now believe that Ganymede's more youthful-looking half could be due to a crust that stretched--as has happened in the past few million years on Europa--rather than any sort of icy volcanism, as many had assumed." -- Richard. A. Kerr, 2001
Exactly what part of "rather than any sort of icy volcanism, as many had assumed" don't you understand?