Letters From Our Readers, Sept. 13, 2021

Ad Astra satellite
Credit: Ad Astra
THE PROBLEM OF POWER Having been involved with electric propulsion mission analysis at the Jet Propulsion Laboratory for many years, I have confidence in the predictions in your article (“Ad Astra Hits Milestone in Electric Rocket Test,” Aug. 9-29, p. 38) . However, the big problem with all electric...

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