"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.
Sign up for a 30-day trial of Amazon Prime (if you're not already a member)
，更多细节参见同城约会
Contrast: segment descriptor A-bit writeback
Сайт Роскомнадзора атаковали18:00