Just 82 kg of xenon powered ESA's SMART-1 to the Moon. It spiralled outward for about 13 months before entering lunar orbit on 15 November 2004. Its ion thruster reached a specific impulse of 1,640 seconds, more than three times the maximum for chemical rockets.

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Here’s smart launches new-generation #1 in China, starting at about $22,100

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https://justpaste.in/vehicles/heres-smart-launches-new-generation-1-in-china-starting-at-about-22100/