Yes. You just need to nudge an existing sufficiently large asteroid onto a collision course. (Targeting a specific city is harder but I don’t know how much harder.) There are how many near-earth and earth-crossing asteroids over 100m diameter?
Yes. You just need to nudge an existing sufficiently large asteroid onto a collision course. (Targeting a specific city is harder but I don’t know how much harder.) There are how many near-earth and earth-crossing asteroids over 100m diameter?