Perhaps reader Donald Peterson (AW&ST July 21, p. 9) has confused the current Orion space capsule with the 1950s/60s era Project Orion, an interstellar spacecraft powered by detonating atomic bombs and riding the blast waves, which is, I’m fairly certain, what reader Jeremiah Farmer was referring to (AW&ST June 30, p. 8). A 1968 study by Freeman Dyson (ow.ly/zt7jm) calculated possible speeds of up to 10,000 kps., thus making a one-way trip to Alpha Centauri take ∼90 years, ...

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