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"The thing that I'm most interested in at the moment is the so-called Infinite Energy solution - the possibility of finding new ways of tapping into virtually limitless sources of energy."
- Arthur C. Clarke

Ramrobot  
  An autonomous interstellar exploration craft using gathered hydrogen for fuel.  

Ramrobots had been first visitors to all the settled worlds. The interstellar ramscoop robots, with an unrestricted fuel supply culled from interstellar hydrogen, could travel between stars at speeds approaching those of light. Long ago, the UN had sent ramrobots to nearby stars to search out habitable planets.
From A Gift From Earth, by Larry Niven.
Published by Del Rey in 1968
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  More Ideas and Technology from A Gift From Earth
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  - Pinta The Robot Sailboat

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