Now it’s time to build a MUCH larger one or more and keep them in storage.
I suppose...
Anything we can move with a projectile that is on a collision course with earth is totally irrelevant. Anything that small that can be altered in course greatly is no danger. Something big headed our way needs something big to move it. We are talking nukes.
The vast amount of energy of destruction from nukes is due to X-Rays released. They heat the air to incredible temps causing a shock wave of destruction and surface vaporization from said same X-Rays. In space there is no atmosphere. Almost all the energy is X-Ray. The incoming asteroid would have vaporization on its surface and thus a repulsive force due to gases of vaporization. It will not destroy the asteroid but put it on a safe trajectory.