Avi Loeb always says the aliens are coming for us. Other people say he is wrong because no aliens have conclusively and obviously showed up since he started making these predictions. The disturbing part is that the objects in question are either showing up much more often than they used to and/or much more often than predicted, or else they have always been showing up and we have just recently developed the technology we need to notice that they are there.

“The brightness of the object implies a diameter of 20 km, and there is not enough rocky material in interstellar space to deliver such a giant object per decade,” Loeb said…

He went on to say he thinks there’s a chance that the object could be engineered rather than naturally occurring…

“[31/ATLAS] may come to save us or destroy us,” he said. “We’d better be ready for both options and check whether all interstellar objects are rocks.”