*NASA scientists think they can demonstrate a revolutionary
propulsion system, an immense, super-lightweight sail that
harnesses the power of solar photons to propel spacecraft
faster and farther than ever.
Carl Sagan in his book Cosmos showed many possible
different interstellar space craft designs including some
that used fusion. But he ultimate dream concerning travel
among the stars comes from an engine powered by energy
from empty space or the zero point energy. In any case
we can look forward to a future sailing to the stars!
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