The clouds and dramatic light rays that formed at sunset yesterday just east of where I live here in Colorado sure did look like an alien invasion had begun.
But the flying saucers were a particularly cool kind of cloud formation that’s common in these parts. And those rays? As ominous as they looked in combination with the saucers, they were a spectacular example of a phenomenon known as anticrepuscular rays. More about them in a minute.
But first, what about those clouds? They are kn