Blue Origin’s lunar lander, Endurance (also referred to as MK1), completes testing at NASA in a vacuum chamber, according to NASA and Phys.org. Endurance is an uncrewed cargo lander built and funded by Blue Origin as a commercial demonstration mission. The project aims to advance capabilities for NASA’s Human Landing System, in support of the Artemis program and future lunar surface operations. The testing takes place in NASA’s Chamber A and focuses on validating aspects of the lander’s performance in space-like conditions. Both outlets describe the effort as part of a public-private partnership model. Blue Origin performs the work under a reimbursable Space Act Agreement with NASA. The sources emphasize that the chamber tests are a step within the broader demonstration approach, intended to provide data and experience relevant to developing crewed lunar landing systems. No additional launch date, mission timeline, or test outcomes are specified in the provided excerpts.