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December 3, 2020 11:20 pm

China's Chang'e 5 Probe Lifts Off From Moon Carrying Lunar Samples

China's Chang'e spacecraft has lifted off from Oceanus Procellarum at 10:10 EST Thursday, carrying with it the first fresh lunar samples since 1976. Space.com reports: Six minutes later, the ascent spacecraft achieved lunar orbit, marking a huge milestone in the Chang'e 5 mission to return lunar samples to Earth. The ascent vehicle's job now is to meet up with the Chang'e 5 orbiter while still circling the moon, and then transfer its precious cargo to a return capsule for the journey home. That next stage is an extremely challenging rendezvousing and docking between the small ascent vehicle and the Chang'e 5 orbiter while orbiting the moon. The activity needs to be automated due to the time delay in communicating across the roughly 236,000 miles (380,000 kilometers) between the Earth and the moon. The two spacecraft will begin a final approach sometime on Saturday (Nov. 5)and complete the docking 3.5 hours later. If all goes well, China will then prepare for the final leg of the journey to deliver the first lunar samples to Earth in 44 years. The lunar samples won't be coming home immediately however. The Chang'e 5 spacecraft will need to wait in lunar orbit for a number of days for a narrow window in which to fire its engines and head for Earth. The careful timing of this trans-Earth injection maneuver will allow the orbiter to deliver the reentry module to Earth at the precise time in order to land in Siziwang Banner, Inner Mongolia -- the same site used by the China National Space Administration to return astronauts home aboard Shenzhou spacecraft. The journey back to Earth will last 112 hours -- just over four and a half days -- before the reentry attempt. As spacecraft returning from the moon are traveling faster than those reentering from low Earth orbit, such as trips from the International Space Station, the Chang'e 5 reentry module will bounce off the atmosphere once to help it slow down before taking a final, fiery plunge to Earth.

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