President Obama is expected to announce what he intends to do about the Constellation programme in October.
BBC: Test ignition for 'Moon rocket'
Whether Nasa could maintain this schedule even if President Obama endorses the Constellation programme is open to question, however.
BBC: Spaceship passes critical review
Those could range from continuing to fly the space shuttle to moving forward with the Constellation programme without any changes, he said.
BBC: Nasa defends its spaceflight plan
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