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A comment on SpaceX launches first U.S. national security space mission. Parent comment

Re:SpaceX launches first U.S. national security space mission by pilsetnieks on Monday December 24, 2018 @06:34PM (#18754894)
Ion engines still need propellant, you might be thinking of the so far unproven EM drive.
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Re:SpaceX launches first U.S. national security space mission by elihu on Monday December 24, 2018 @09:50PM (#18755565)
Ion engines need propellant, but they need a lot less of it to achieve a similar result as a traditional rocket engine.
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