The US Air Force's X-37B space plane landed Sunday back on Earth after spending 780 days in orbit, the longest mission in the mysterious military test program's history.
원문출처 : https://www.cnn.com/2019/10/29/tech/air-force-space-plane-landed-intl-hnk-scli-scn/index.html
원문출처 : https://www.cnn.com/2019/10/29/tech/air-force-space-plane-landed-intl-hnk-scli-scn/index.html