Rats. From the title, I had been hoping that it was referring to the Planetary Grand Tour. (http://en.wikipedia.org/wiki/Planetary_Grand_Tour http://en.wikipe

Rats. From the title, I had been hoping that it was referring to the Planetary Grand Tour. (http://en.wikipedia.org/wiki/Planetary_Grand_Tour http://en.wikipedia.org/wiki/Planetary_Grand_Tour ), the configuration for which will not occur again until about 2150. I had hoped that this article meant that there was an alternate, though perhaps slightly less fuel efficient, route.