Why is Jupiter so heavy if it's made of hydrogen and helium?

Thanks for A2A. You must have asked his question because of the conventional and quick popping idea of hydrogen being a gas always. read more

Jupiter has a liquid Hydrogen layer which is very expansive and thick (about 1.5 earth diameters) which accounts for its heavy mass. Gaseous Hydrogen has a minute density of 0.089 g/L whereas Liquid Hydrogen has a partly significant density of 70.85 g/L and we can see a 796 times increase in weight for the same volume. read more

Jupiter is not only made out of hydrogen and helium, there are other things as well. Even hydrogen and helium have mass. And we are talking about a ball about 1000 times the volume of your entire planet. That beast stretches half way between earth and moon. Now just imagine we need 100km of atmosphere at earth to create atmospheric pressure on surface. read more

Jupiter is composed of gases — hydrogen and helium, mostly — all the way down to its core, which may be a molten ball or a solid rock. Jupiter is composed of gases — hydrogen and helium, mostly — all the way down to its core, which may be a molten ball or a solid rock. read more