Commercial space exploration

Is commercial space travel or space tourism sustainable, or is outer space exploration too risky for commercial use?.

Greenhaven Pub.
2019
9781534503595
book

Holdings

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256968160794882364658600857050WIH511WIS0032439338.0999 COM338.0916377825731736800991
283869163213032390658600857050HOS269HOS0047789361 EBO36116377825731736800991
375751670751512387658600857050GEH226GVS0069855338.0999 COM338.0916950443851736800991