[Fringe Science]Holy Nuclear Weapons, J'onn J'onnz!
(ganked from autopope
It appears the author of the paper is also connected to a lot of really fringe stuff, so the likelihood of this proving out seems very low. Still, it's a fun idea to use in a story sometime...
Apparently there's evidence that a gargantuan NATURAL nuclear reactor operated on Mars about a billion years ago
... and because it was huge and buried deep, naturally tamped itself until it BLEW UP.
How much blowing up, you ask? Somewhere between one and ten BILLION MEGATONS. That's dinosaur-killer level. On Mars, which is a lot smaller than Earth.
Of course, maybe we're actually looking at the reason we have no Martians invading...