There have been two failures: The shuttle Challenger and seven astronauts were lost just after launch in January 1986 due to an O-ring seal leak in a solid rocket booster that led to an explosion.

有两次失败的教训：1986年1月刚刚发射过后，一个固体火箭助推器的O型圈密封泄漏导致的爆炸，使我们失去了挑战者号和7名宇航员。

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However, after the Challenger shuttle was lost in an explosion in 1986, there was debate about what to do.

但是，由于1986年挑战者号航天飞机的失事，NASA内部关于备用配件的问题一直争论不休。

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It wasn't long after the Challenger explosion that word of a pre-launch argument leaked out.

NPR: Challenger: Reporting a Disaster's Cold, Hard Facts

The mind-boggling expense, the riskiness and the fragility of our existing space launch capabilies were hammered home to all of us in the aftermath of the Challenger explosion.

CENTERFORSECURITYPOLICY: The National Aerospace Plane

Some residents spoke to Forbes at the time, describing the accident as resembling the infamous Challenger explosion, and adding that Blue Origin remains something of a mystery even locally.

FORBES: Billionaire Space Race: 2012 Will Be The Year Private Space Transport Takes Off