For the past three years, Jeff Bezos’ space company, Blue Origin, has been quietly developing a high-performance, liquid-oxygen- and liquid-hydrogen-fueled engine to power a human-class lunar lander, with the first test-firing expected this summer. The BE-7 engine, which has 10,000 lb. of thrust and 453 sec. of specific impulse, was among new details of the company’s Blue Moon lunar lander presented by Bezos May 9 during a private event at the Walter E. Washington Convention ...

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