the spokesman says that statement comes after the government looked at several data sources other than this tape. although they will not tell us what the data sources were. with us now is the physicist who is the author of "physics of the impossible," and will explain to us exactly what happened. thank you for coming. >>guest: glad to be on. >>shepard: you go point by point. you stopped this individual wrote and looked frame by frame. >>guest: at first i thought, my god unauthorized launch of ballistic missile. scandalous. or an accident. but then i said, wait a minute, you go frame by frame something is wrong. the object is not accelerating. rockets have booster rockets take it to 15,000 or 18,000 miles an hour and this is cruising constant speed. second, changing direction slightly. ballistic missiles never change