Can you prove that magic isn't real?

UFO-type extraterrestrial life is as unreal as wizard magic. It is effectively the same thing.

There is a non-zero chance that angels and magic are not real, and the chance of aliens being real, while perhaps greater, still relies mostly on conjecture, and is ultimately pretty close to those two things.

Show me a demonstrably provable example of either.

In an "infinite worlds, infinite possibilities" sense it's possible that something, somewhere in the universe is alive and/or magical. But there is no telling that 1) that's actually happening, and 2) that we'd ever encounter it before the heat death of the universe.