From: "Phil Payne" 

> Deep space exploration won't really work with solar since by it's very
> nature you are going to be traveling outside the solar system (too far
from
> a star to use solar). But relay control stations might be solar powered to
> get the signal a bit more range.

Nurdge.  Gets interesting.  One way of leaving the solar system's gravity
well is a solar sail.  Focus it on the probe and you have serious energy
for quite a long time.

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