Space debris spotted over Wisconsin; UFO expert weighs in

MILWAUKEE (CBS 58) -- Did you see it last night? A bright flash streaking through the sky. People all across our area did, and it has caused speculation into what caused it. We sent CBS 58's Bill Walsh to try to unravel the mystery. 

One of the leading experts on UFOs lives in our area. He's about to release his 19th book on the incident in 1947 in Roswell, New Mexico. 

We asked him what happened Tuesday night.