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

In Poul Anderson’s 1970 novel Tau Zero, a starship crew seeks to travel to the star Beta Virginis in hopes of colonizing a new planet. The ship’s mode of propulsion is a “Bussard ramjet,” an actual (though hypothetical) means of propulsion that had been proposed by physicist Robert W. Bussard just a decade earlier. Now, physicists have revisited this unusual mechanism for interstellar travel in a new paper published in the journal Acta Astronautica, and alas, they have found the ramjet wanting. It’s feasible from a

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