Link here. The short version – a distant star has occasional dips in brightness. Dips in brightness would normally be caused by orbiting planets – a big planet like Jupiter orbiting the star might cause periodic 1% or so dips in brightness. But this planet’s dips don’t appear to be regular, so far, and are much larger than 1% – up to 22% of the light from the star is sometimes blocked! That’s really huge – something really, really big is crossing between us and the star.
So what’s causing this? Big dust clouds, or something? Or a gigantic construction project by aliens?
Probably not aliens, but it’s still a pretty cool story.