"Launching radioactive material through the Earth's atmosphere brings safety concerns. You have to have a special license to do that, but it is not insurmountable," says Dr Simeon Barber, planetary science specialist at the Open University.
Nasa said this additional flight would not slow down its return to the Moon - it is still aiming for 2028 for one or even two lunar landings in what will be Artemis IV and V.。爱思助手下载最新版本对此有专业解读
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