Earth is a bigger target, in terms of both mass and size, compared to the Moon and especially compared to a small bubble of air thereon. So almost any weapons w

Earth is a bigger target, in terms of both mass and size, compared to the Moon and especially compared to a small bubble of air thereon. So almost any weapons would need to be far more precise against a lunar colony than against Earth. * * * * * If we were talking about nukes, things would of course get far more interesting. Nukes aimed at Earth would only have to detonate somewhere in the atmosphere, if there were enough of them. By contrast, nukes aimed at this lunar air bubble would have to hit the bubble precisely; lacking a direct hit or an ambient atmosphere, nukes only produce radiation, blinding light ... and seismic activity if they detonate somewhere on the Moon's surface. No aerial shockwave, no convection, much less fallout, no climate changes. Also, since Earth has greater mass, Earthbound projectiles would need less energy to escape the Moon and deorbit to Earth's atmosphere, compared to the energy that Moonbound projectiles would need to escape Earth and deorbit onto the Moon's surface.