Weird Fantasy #16

A uranium mine owner owns a mining plant on Mars but has tapped out all the uranium on that planet. When he finds out that Venus is rich in Uranium, he decides to mine it from that planet and then teleport it to his mining plant on Mars. The problem is, the removal of uranium from Venus causes its mass to decrease while adding all that uranium to Mars causes its mass to increase. This causes the two planets to leave their respective orbits and ultimately crash into the Earth destroying it.