And on the private front, tragedy and triumphs pushed commercial space travel a few steps closer to reality as the Age of Spaceflight turned 50 this year.

• 在太空飞行时代即将在今年迈入第五十个年头之际，私人太空飞行领域的悲剧和胜利推动商业太空飞行向现实更近了一步。