"Like a thorn in the side of mainstream researchers, Muller's Nemesis theory -- that our Sun has a companion star responsible for recurring episodes of wholesale death and destruction here on Earth -- seems to reemerge periodically like microbes after a mass extinction.

It's a theory that has many detractors. And it's a theory that has been beaten down and left for dead in the minds of most scientists.

Yet it is a theory that just won't die."