austraveller2017-10-16 18:53:54

https://sputniknews.com/science/201710161058283939-nasa-ion-thruster-space-travel/

The development of the X3 engine, designed at the University of Michigan in cooperation with the US Air Force, is still underway, but the technology already looks promising for long-distance space travel.

扎心了老铁2017-10-16 19:05:38
美国人一步一个脚印,不炒虚的玩概念股,到头一场空
Giantfan2017-10-16 19:18:20
It still can't explain why a 500km-range missile is NOT