Earth Needs A Good Comet Deflector. It seems to me that they could put new rockets on the International Space Station when it's current original useful life is used up and then push it up into higher orbit perhaps a lunar orbit; then make a comet deflector out of it. Perhaps give it a large spiderweb of cables and girders so it can wrap around a number of different types of potentially earth-impacting objects. The added engines would then be used to move the dangerous object. If a hundred years or so goes by and it doesn't get used as a comet deflector, it could be landed on the moon as a tourist attraction saving it for future generations to appreciate. Due to the mass of the International Space Station, it would be very useful under many circumstances as a comet deflector if it could be strengthened and moved to the right orbit. Why not do that when its useful life has passed? The cost to do it is getting cheaper every day.