There are a handful of known exoplanets with three host stars, and quite a few out there with two suns. Where does all this multistar madness end? Is it possible for alien planets to have four, five, six or even more suns?
Nebulas come in all sorts of shapes, sizes, colors and configurations, from almost-perfect spheres and shells to dazzlingly complex helices to tangled wrecks. But where exactly do they come from? And, perhaps more importantly, where are they going?