"Alien matter" detected by a NASA spacecraft orbiting Earth shows that the chemical make-up of our solar system differs from that of the surrounding galaxy. Researchers discuss the possible meaning of this mismatch in today's story from Science@NASA.
FULL STORY at http://science.nasa.gov/science-news/science-at-nasa/2012/10feb_alienmatter/
A video version of this story is available at http://www.youtube.com/watch?v=krDQFFkB84I
