“发现号”是NASA最老的航天飞机，也是NASA由三架航天飞机组成的“星河舰队”中飞行次数最多的。
Discovery is NASA's oldest flying space shuttle and the most-flown of the agency's three-orbiter fleet.
NASA还有计划好的最后两项航天飞行任务，并希望国会通过其经费申请，在2011年“星河舰队”退休前再多进行一次飞行。
NASA has two final shuttle missions scheduled and is hoping for final funding approval from Congress for one extra flight, before retiring its three orbiters in 2011.
NASA还有计划好的最后两项航天飞行任务，并希望国会通过其经费申请，在2011年“星河舰队”退休前再多进行一次飞行。
NASA has two final shuttle missions scheduled and is hoping for final funding approval from Congress for one extra flight, before retiring its three orbiters in 2011.
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