Sometimes planetary physics is like being in a snowball fight. Most people, if handed an already-formed snowball, can use their experience and the feel of the ball to guess what kind of snow it is composed of: packable and fluffy, or wet and icy.
Planetary scientists use physics and images of impact craters to gauge thickness of ice on Europa retrieved 20 March 2024 from https://phys.org/news/2024-03-planetary-scientists-physics-images-impact.html
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