An Aug. 27, 2010, commentary by NBC News space analyst James Oberg about the new book by journalist Leslie Kean, "UFOs: Generals, Pilots and Government Officials Go on the Record," seems thought-provoking.

The article, posted on MSNBC.com, is titled "UFO book based on questionable foundation."

Oberg is a 22-year veteran of Houston's NASA Mission Control in Houston and has written books himself on the subjects of space exploration and space policy.