Does space exploration justify the cost?
I think so. The money spent does not go zipping off into space. It goes into the paychecks and pockets of engineers, technicians, support staff, vendors of wire, tools, optical lenses, medical supply manufacturers, and tens of thousands of other professions. They use this money to pay their employees who use it to raise their families, pay the dentist, the grocery, dry cleaner and gas station. This is something that returns the money we pay in taxes. It goes back into circulation and every one of us benefit through more employment, and ultimately by new and improved technology.