why there needs be a gap, 2010 to 2013, between shuttle and CEV?

why there needs be a gap, 2010 to 2013, between shuttle and CEV?

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送交者: JZ 于 2006-09-01, 10:00:14:

回答: I was hoping NG and Boeing got the contract. Looks like Boeing 由 steven 于 2006-09-01, 09:55:56:

Just because it takes time to build CEV?

It is 2006 now, and even they started last year, it won't be ready - steven (9 bytes) 2006-09-01, 14:00:26 (100523)