There is something fascinating going on at Tabby's Star. Its light is fluctuating in a way that we've not seen before with any other star. This could mean that the star is behaving in a way we don't understand, or that there is something extraordinary orbiting it.
Normally we detect exoplanets by the dimming of the parent star as the planet passes between it and us, but the variation of Tabby's Star is so enormous that no conceivable planet could account for it.
One hypothesis is that instead of a single body it could be lots of smaller bodies close together. This could be a swarm of comets, for example, or a planet that's broken up.
Aliens are one possible, but unlikely, explanation, but then aliens are a possible but unlikely explanation for anything strange we see in the night sky. Over the years we've seen lots of strange things, none of which turned out to be due to aliens. In most cases we discovered something new we didn't know about the natural universe, and this will probably be the same.
Our default response to news stories about aliens should be the same as Lister's in 'Red Dwarf':
Lister: Your explanation for anything slightly peculiar is aliens, isn't it? You lose your keys, it's aliens. A picture falls off the wall, it's aliens. That time we used up a whole bog roll in a day, you thought that was aliens as well.
Rimmer: Well we didn't use it all, Lister. Who did?
Lister: Rimmer, ALIENS used our bog roll?
Rimmer: Just cause they're aliens doesn't mean to say they don't have to visit the little boys' room. Only they probably do something weird and alien-esque, like it comes out of the top of their heads or something.
Lister: Well I wouldn't like to be stuck behind one in a cinema.