Posted by tourdemars to Humans To Mars at April 28, 2011 10:48 AM

A particle detector being prepared for launch Friday aboard space shuttle Endeavour is intended to answer some fundamental questions about physics, but it has a practical side as well -- testing a way to shield future astronauts from potentially harmful cosmic rays. At the heart of the Alpha Magnetic Spectrometer, or AMS, is a 2-ton magnet that will bend high-energy particles into five detectors for analysis. Scientists hope to learn about dark matter, antimatter and other exotic phenomenon, but engineers at NASA who are developing next-generation spaceships are keen to learn how similar magnets could be used not to attract particles, but to repel them. A magnetic shield would replicate the protective cocoon of Earth''s naturally occurring magnetic field, which helps protect the planet from harmful radiation.