The Death Star is at most 100 miles (160 kilometers) in diameter, and would not be able to survive long in low Earth orbit. 'The best way to build a Death Star would likely be to mine asteroids and possibly the moon for metals, print the massive parts, and then transport them to the neighborhood of the Earth or whatever planet you want to destroy,' he said.īut even then, there are problems, he added. The cost is also difficult to bear: $850 quadrillion, according to the White House's response to the online petition, which is many times the U.S. Rocket launches to send all that metal and other building materials to space would 'pollute the atmosphere to the point that anyone left who could use the Death Star would have to live on it - Earth would be uninhabitable,' Pyle said.