The source of a mystery trace of gamma radiation in the Milky Way has been traced back to a Black Widow star.

New season, new war, and of course, a new crazy-pants villain for our heroes (or what remains of them) to deal with. As Daryl (Norman Reedus) put it in the SDCC trailer, sometimes it feels like they're just surviving from one big fight to the next. But if that footage was any indication, The Walking Dead Season 10 is poised to deliver one of the biggest battles yet, and when you're a decade into a series, it's time to break out the craziest of the big bads. How crazy? Well, we've got to the point …