For NASA and the European Space Agency, the next major mission to the outer planets has come down to Titan or Europa (and Ganymede, really, but you’ll have to read our story to understand how that fits in). The science chiefs for the two agencies, Ed Weiler and Dave Southwood, were planning on make a decision last week, via teleconference. But they now plan to meet face to face at the end of next week. I told one of the big Titan proponents, Jonathan Lunine, at the University of Arizona in Tucson, that he might get a present in time for Valentine’s Day. But he says he’s equally prepared for a Friday-the-13th “chainsaw delivery”.