In total there are 10 separate investigations – or modules as they are called. So far only two, looking at pandemic preparedness and government decision-making, have been completed.
China's Long March 5B booster re-entered over the Indian Ocean in 2022, and the Tiangong-1 space station mostly burned up over the Pacific in 2018.
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"Building even a modest lunar habitat to accommodate a small crew would demand megawatt-scale power generation. Solar arrays and batteries alone cannot reliably meet those demands," suggests Dr Sungwoo Lim, senior lecturer in space applications, exploration and instrumentation at the university of Surrey