Someone in California and Nevada must have been a little too excited about 'The X-Files' is coming back to TV or they are glued to the new season of 'Fargo' (mini-spoiler!), however the light in the sky turned out to be a scheduled unarmed missile test courtesy of the USS Kentucky.  Here's video of the, at first, unexplained incident. 

The USS Kentucky is an Ohio-class ballistic missile submarine. It's the third ship to be named for the 15th state. The Kentucky has been featured on episodes of the History Channel's 'Modern Marvels' and the Smithsonian Channel's 'Mighty Ships'. Another fun fact, it was christened in 1990 with a bottle of custom blended Kentucky bourbon, rather than the traditional bottle of champagne.