Last Friday, we woke up to a hot air balloon coming our way: We often see them in the sky north of us, but they almost never come south. This one went almost directly over our house and then, to avoid power lines, went west and landed in a small park down the road. The kids and I drove the half mile or so to watch them take it down, and I learned a little about flying hot air balloons from one of the ground crew. (Now that must be a pretty boring job--following a hot air balloon in a van and trying to figure out where it's going to land.) Did you know there's no steering? Just up and down. Wind currents change direction at different elevations, so they steer by going up or down and seeing where the wind takes them. Interesting. And kind of scary. (Maybe they have a way of knowing which direction the wind is going. I don't know.) That was our morning adventure. Friday's nighttime adventure was attending a star party at Craters of the Moon National Monument. Viewing …