At least according to the Daily Mail. Dr John Brandenburg is advancing the idea that certain phenomena found on Mars are best explained by Nuclear weapons detonations and that the aliens that fought this war could be coming here next.
You can read the idea in detail at Ancient Martian civilisation was wiped out by nuclear bomb-wielding aliens – and they could attack Earth next, claims physicist.
I’m a little skeptical of the idea but I love this sort of conspiracy stuff and stories running with the idea are among some of my favourite. I really enjoyed the Area 51 series from Bob Mayer, that runs with this sort of idea, and I have always loved Stargate SG-1 and the spin offs Stargate Atlantis and Stargate Universe
Also I am aware this is probably the most clickbaity title I have ever used.