On the afternoon of September 24, NASA held an online meeting to discuss the latest work arrangements for the upcoming Osiris Rex mission (tag). In a few weeks, the spacecraft will stop briefly on the asteroid Bennu to collect small samples of gravel and return to orbit. The agency has been preparing for the encounter months in advance, including selecting locations for sample collection and arranging landing exercises. < / P > < p > the agency is actively preparing for its contact with the asteroid Bennu next month. On October 20, Osiris Rex will land and collect samples in the Nightingale area selected by NASA. < / P > < p > if it fails for some reason, Osiris Rex also has an alternative site to try. NASA reported a few months ago that the Bennu is harder than expected and that the correct landing point will be crucial to prevent the spacecraft from being in danger. < / P > < p > NASA explained that nightingale is located 52 feet (16 meters) north of the asteroid Bennu. The area provides the most fine-grained material for Osiris Rex, but is also surrounded by boulders. < / P > < p > NASA points out that the Osiris Rex body is quite large (approximately equal to a large van), which means that the research team must carefully drop it to the correct landing site and avoid bumping into any boulders. < / P > < p > before landing on the surface of asteroid Bennu, it will need to undergo a total of three maneuvers. This includes four hours of approach to Bennu from orbit, then about 30 minutes to collect samples and take off again. < / P > < p > in this half hour, the most touching moment is 16 seconds before hitting the ground. The pressurized nitrogen cylinder will blow away some of the gravel on the surface, and Osiris Rex will start the thruster again after the acquisition is completed to return to orbit around the asteroid. After 12 years, “world class Super project” Shantou Bay Tunnel ushers in a historic breakthrough today

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