And cost how much more? More than 1000x more? It's probably economically worth it to just send probes. Better yet, swarms of mini-probes: http://news.mit.edu/20

And cost how much more? More than 1000x more? It's probably economically worth it to just send probes. Better yet, swarms of mini-probes: http://news.mit.edu/2006/microbots http://news.mit.edu/2006/microbots