The bright object with a blue trail streaking across the western sky caused many Los Angeles residents to think they were seeing an alien spacecraft Saturday night, November 7, 2015.

But the U.S. Navy acknowledged the dramatic light show was a Trident missile launched from a submarine.

Watch a video posted soon after by some guys in Sherman Oaks, California. You'll see why they were startled.

My photo of a bright fireball seen from Pasadena tonight. Note the blue tail. @myfoxla @plutokiller @BadAstronomer pic.twitter.com/IEklVG2xLx

-- Ron Baalke (@RonBaalke) November 8, 2015

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