While that may make suborbital travel safer, it would add significant cost and complexity to an emerging industry that has until now operated largely as the playground of billionaires and dreamy engineers.
出自-2015年12月閱讀原文
It is the first to launch suborbital flights.
出自-2015年12月閱讀原文
But more recently, companies have begun to plan more affordable " suborbital " flights — brief ventures just to the edge of space's vast darkness.