Bruce Bostwick wrote:
> 
> That being said, what I really wish someone would propose is sending 
> a  robot propulsion/navigation system out to a conveniently sized 
> nickel/ iron asteroid, bring it home, and park it in an orbit high 
> enough to  keep it from decaying for the foreseeable future 
>
Great idea! All it would require was a propulsion system
that does not waste fuel to change the asteroid's speed from
about 50 km/s to 30 km/s in the perihelium of the transfer orbit,
and it would be cheaper than launching stuff from Earth at
the enormous 10 km/s speed (give or take a few km/s).

Alberto Monteiro


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