FiReaNGeL writes "NASA's sun-focused STEREO spacecraft unexpectedly detected particles from the edge of the solar system last year, allowing scientists to map for the first time the energized particles in the region where the hot solar wind slams into the cold interstellar medium. Mapping the region by means of neutral, or uncharged, atoms instead of light "heralds a new kind of astronomy using neutral atoms," said Robert Lin, UC Berkeley professor of physics and lead for the suprathermal electron sensor aboard STEREO. "You can't get a global picture of this region, one of the last unexplored regions of the heliosphere, any other way because it is too tenuous to be seen by normal optical telescopes."" Link to Original Source
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