Star Trek fans know the episode of the Doomsday Machine. The USS Enterprise encounters a planet killer. A giant robot that destroys and eats planets. Naturally Kirk figures out a way to destroy it.
So clearly in the Star Wars vs. Star Trek matchup, The Death Star gets eaten for breakfast by the planet killer, no contest.
Wel, a different version, which I proposed here, would involve a giant swarm of vonNeumann self-replicating robot probes that, over time, just turn a planet to dust in the process of making more of themselves.
In fact, I stated that, should astronomers happen to find an old or mature star with a young dust disk of rubble surrounding it, then maybe it is time to be afraid.
Well, they found one. It's mature star that is surrounded by a young disk of rubble. There are all sorts of proposed methods for this to occur naturally, but it could be ET. If ET phones, don't answer.
So, and so close to Halloween. If ET rings the doorbell, turn off all the lights, turn off the music and the TV, and go hide the behind the couch.
Because that strategy will work against vN probes as good as any.