A Staple of Sci-Fi Space Travel Will Likely Remain a Fantasy

Physicists say an interstellar engine popularized in the '60s is technically feasible, but it would take a more advanced civilization to build one.

A Staple of Sci-Fi Space Travel Will Likely Remain a Fantasy
Physicists say an interstellar engine popularized in the '60s is technically feasible, but it would take a more advanced civilization to build one.
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