Might need to load this back up. Seems to have been an update where “mysterious aliens have just declared war”. There seems to be a lot of threads on reddit about this. From what ive just read on pc gamer, the ships are “organic in nature” and if you shot a piece of the ship and collect it, “The tissue sample is corrosive, and as soon as jcollasius scoops it up it begins eating away at his ship’s internal systems.”
Video of an encounter below.