广东潮州，千年古桥广济桥畔，广济楼巍然矗立。
Inside a large warehouse on the outskirts of Copenhagen, cases of rock samples are stacked floor to ceiling.
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"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.
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