Death Star shields vs Alderaanian debris: to scale

[jwl]

If shield power is an indication of destructive power (and alderaan has shields that can withstand a considerable fraction of the death star beam) then alderaan itself can go around blowing up planets too.

[Darth Tanner]

I believe Ganymede is thought to have solid 'ice' from water pressure and low temperature solidifying the water at its depths.

I think under about 20km water will start to turn into a type of ice naturally from water pressure... obviously that twice the depth available on Earth but if your oceans go all the way to the core?

[Sea Skimmer]

Not to mention that the pressure in the planet's "core" would have been immense, I can't imagine large fish being able to survive at those depths. Not in those shapes anyway.

Why would shape matter? The pressure is balanced internally and externally. Its pressure change that is a problem, barring absolutes people are talking about like water turning into ice. Deep sea fish on earth already can't survive if you pull them to the surface, just as humans will die from even 200ft depths if the change is rapid. But this is because of gases dissolving in and out of the blood stream and the cells violently enough to cause damage, not because of any specific pressure rating in a direct manner.

Last I checked one of the more annoying qualities of water was that you can't compress it.

Water can compress. For normal purposes, even most engineering purposes, water won't compress in any meaningful terms which is why people say it can't, but in absolute terms it can and does. IIRC the water at the bottom of the ocean, ~15,000ft is compressed by about 1% volume reduction compared to surface water. The pressure is also something like 450 bars at that depth. Still that isn't that much compared to some steels which have a compressive strength of 6500 bars or more. Hydraulics pistons though are usually at 300 bars or less even in advanced aircraft, which is where the 'incompressibility' is often cited, so in those terms the compression means very little. The hydraulic lines swelling from the pressure is a bigger error then the compression of the fluid.

[Eternal_Freedom]

I was under the impression that most really deep-sea fish evolve into broader, flatter shapes to better cope with the pressure. If not, oh well, I withdraw that point and apologise.

Still, the planet's core being filled with water still precludes the planet having a load of radioactive decay to keep it warm inside and no rotating core for a magnetic field. I'm sure life could quite probably evolve on such a planet, but I doubt it would be as human as the Gungans.

[biostem]

I was under the impression that most really deep-sea fish evolve into broader, flatter shapes to better cope with the pressure. If not, oh well, I withdraw that point and apologise.

Still, the planet's core being filled with water still precludes the planet having a load of radioactive decay to keep it warm inside and no rotating core for a magnetic field. I'm sure life could quite probably evolve on such a planet, but I doubt it would be as human as the Gungans.

IIRC, organisms that live in the very deep ocean are, for all intents and purposes, water - their internal and external pressures equalize, and so there really is no difference in pressure that they have to deal with. Humans, OTOH, need a difference in pressure in order to breath and so forth.

Regarding Naboo and the "Planet Core" - yeah, I just took it to mean that it was network of underwater caves, and not the actual center of the planet.