When someone sends boulder-sized rocks down to planet Earth from the moon, they approach like meteors. On the right trajectory, they don't burn up in the atmosphere, but can come down with the force of a nuclear blast.
Our tiny outpost of sentient shape-shifting wolves and escapees from the slave-labor moon colonies had caused a stir up there. They probably still didn't figure out how we managed to help all those people disappear, cross 250,000-miles of space, and wind up on Earth, healthy and smiling in the videos we sent back.
But, they did figure out where our headquarters was, and targeted it with a string of flaming rock-meteors, all falling in a straight line toward our little valley.
If we evacuate in time, we can still avoid that impact. But, all it really means is: Earth and the Moon are at war, and they have the better weapons. Or, so they think...
