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UFO
UFO  
Dear Prof James

http://en.wikipedia.org/wiki/Unidentified_flying_object
http://thegrio.com/2012/11/14/19-year-old-...ts-ufo-sigting/

Do UFO really exists OR Can we classify them as Science Fiction Objects ?.

If i am not wrong, There were also some movies also made on Flying Saucers regarding aliens Landing from UFO.

Another Interesting point to be noted is UFO Shape. i.e. flat bottomed saucer, convex on one side.

http://www.hyper.net/ufo/overview.html

Awaiting your reply,

Thanks & Regards,
Prashant S Akerkar

Answer
Certainly unidentified flying objects exist. Any flying object which we cannot identify fully qualifies as such. That has nothing, however, to do with whether unidentified flying objects are spaceships of a nonterrestial origin. To date there is no scientifically verifiable evidence to support the assertion that aliens from another planet have visited the Earth. It would, of course,  be impossible to assert that such visits have never occurred. However, in the absence of substantive evidence to the contrary the default position MUST be that such alien visits have never occurred! This is the same argument that must be made in general. The default position (from a scientific point of view) is that unless evidence exists to the contrary we must assume the negative regarding such claims.
All other speculations regarding such objects remain as such, speculations.

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James J. Kovalcin

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I am teaching or have taught AP physics B and C [calculus based mechanics & electricity and magnetism] as well as Lab Physics for college bound students. I have a BS in Physics from the University of Pittsburgh and a Master of Arts in Teaching from same. I have been teaching physics for 34 years. I am constantly updating my skills and have a particular interest in modern physics topics.

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