How much uranium will be required to blow up the whole planet?

About all uranium in the entire Solar System. “To blow up the whole planet” means to not only kill all life, but to actually cause the planet to go KABOOM, like Alderaan in Star Wars. There is a lot of energy that holds Earth together. read more

More than exists in the solar system. Blowing up the whole planet is a vague term, but destroying then planet (not just its inhabitants) is impossible. read more

~2.3 x 10 18 Kilograms of U-235 to blow the planet 6 x 10 24 / 2.3 x 10 18 = About 1 part in 2,600,000 of the Earth's mass would have to be uranium at the Earth's core (at critical mass density) to blow the planet. read more

Uranium 235 is approx. 0,7 % from the natural uranium; see the link below for the uranium supplies. read more