Tabby's Star is the one with the weird light curves. A lot of little dips in brightness with an occasional huge dip. One possible, but extremely remote, possibility is intelligent beings in process of constructing a Dyson sphere. Right now there is still no really good explanation. Phil Plait in his Bad Astronomy blog discusses the current state of the research on the star. So Maybe Not Aliens, but How About Comets?

Bill Gill

C is not the speed of light in a vacuum.
C is the universal speed limit.