Wow, the Dawn space probe has ion engines http://dawn.jpl.nasa.gov/mission/ion_prop.asp
. Just like TIE fighters (TIE = Twin Ion Engines), though not nearly as strong.
According to the NASA webpage, Dawn's ion engines delivery a thrust of only 90mN (about 0.02 pounds). The ion engines' weak thrust is still very effective for making trajectory adjustments, and it is powered by electricity from Dawn's solar panels. I feel this is nerd-tastic.
NASA photo of ion engine (not sci-fi, but real stuff!):
Humanity is amazing sometimes (but not usually). Not sure how exploring Pluto is going to help solve our fundamental socioeconomic problems.