Blue Origin's MK1 uncrewed moon lander completed its testing in the vacuum chamber. (Image credit: NASA/Blue Origin) Blue Origin's moon lander has passed its tests in the vacuum chamber. What is it? Blue Origin's uncrewed cargo lunar lander, called Moon Mark 1 (MK1) and nicknamed Endurance, has completed its testing in the vacuum chamber, NASA shared on May 4. Article continues below The lander, which is being developed in support of NASA's Artemis program, was tested in Thermal Vacuum Chamber A at NASA's Johnson Space Center in Houston, Texas. These tests evaluated how the spacecraft can hold up against extreme temperatures, and modeled how it will eventually fare in the extreme environments of spaceflight and in the vacuum of outer space. Why is it incredible? Blue Origin's lander is being developed as part of NASA's Artemis program, which aims to return humans to the lunar surface in 2028 .…