"Space flight wasn't practical less than a century ago.  Go back in the files and see what your own colleagues said about it - oh, say about 1940.  These Jupiter proposals are, at best, no farther than drawing board - but the engineers working on them are quite serious.  They think that, by using all that we've learned from deep ocean exploration, plus equipping men with powered suits in which to float, it should be possible to put human beings on Jupiter.  And don't think for a moment that the Martians are any less clever than we are.  You should see their cities."