Actually it's in the works. NASA is developing interplanetary internet so that all the mars probes could use one link to home, and possibly other further away craft could send their signal to relay stations, thus needing less power to transmit more data.
http://spectrum.ieee.org/aug05/1700
http://www.ipnsig.org/home.htm
http://en.wikipedia.org/wiki/Interplanetary_Internet
http://spectrum.ieee.org/aug05/1700
http://www.ipnsig.org/home.htm
http://en.wikipedia.org/wiki/Interplanetary_Internet
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