![]() Intercomparison of positron scattering by all those elements. Positron collisions with helium, magnesium, calcium, zinc, 3. Theory of positron collisions with helium and alkaline earth-like atoms, 2. This doctoral thesis is subdivided into: 1. International Nuclear Information System (INIS) Positron collisions with helium and alkaline earth-like atoms The questions are mostly composites, but they are based on real messages sent to NASA by the public. Following is a list of the most popular "Twenty Questions" sent to Ask an Astrobiologist, organized in a logical succession and answered in some detail. ![]() Most of this fear is directed at astronomical phenomena being characterized on the Internet as threats. Every week I receive dozens of questions sent to the NASA website "Ask an Astrobiologist" from people who are afraid that the world is about to end. As this hoax spreads, many more disaster scenarios are being suggested. ![]() Publicity for the science fiction film "2012" seem to be marketing Hollywood disasters as reality. There are now (September 2009) more than 200 books listed on dealing with the 2012 doomsday. ![]() Stories about the fictional planet Nibiru and predictions of doomsday in December 2012 have blossomed on the Internet and are beginning to creep into the more traditional media. ![]()
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