CHICAGO (FOX 32 News) - Mark Hammergren knows that the truth is out there. An astronomer for the Adler Planetarium – and a confessed X Files fan – he’s lived a life looking up into the stars.

And when it comes to reported sightings of UFOs around the Chicago area, he’s heard a tale or two.

Mark often gets phone calls at the Adler, with people claiming to see unexplainable lights and objects in the sky – unexplainable until Mark starts investigating.

Modern UFO sightings in the U.S. began nearly 70 years ago. During that time, no definitive proof has ever been uncovered.

But that doesn’t mean that the search is over, especially for astronomers.
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