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Originally Posted by Toubrouk
Okay, let's put some numbers into the problem:
So, what we need to know is; what kind of explosive we need to blow a nice chunk of matter that got two-thirds the density of iron weighting 5.98 x 1024 kg.
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I wouldn't look at it that way.
The earth has both HP and DR. The HP come from the total mass, which you can get from density and radius. But the DR appears to come from the crust, which is a fairly thin layer of rock. Once you get through that, you're dealing with fluid material most of the way down.
I wouldn't consider the core as having DR; it's not shielding anything. Oh, I suppose you could say that the outer surface of the core has a DR, like any other chunk of solid iron, but compared to the damage that can shatter a planet, it's going to be pretty negligible. You might as well assume that the entire mass of the earth is one HP pool, and not try to do layered defenses.
Now, a gas giant is not going to have any DR, if you look at it this way. Jupiter's surface is not rock.