"NASA Deputy Administrator Shana Dale, who is guiding the long-term strategy development effort among 14 of the world's space agencies, said, "This strategy will enable interested nations to leverage their capabilities and financial and technical contributions, making optimum use of globally available knowledge and resources to help energize a coordinated effort that will propel us into this new age of discovery and exploration."
"In the wake of the space shuttle Columbia accident, President Bush announced in 2004 a plan to return astronauts to the moon by 2020. His plan would take 16 years, twice as long as NASA's first trip to the moon took in planning. NASA has refused to estimate a price tag for the project."
NASA Plans Lunar Outpost, Washington Post
"NASA officials declined to put a price tag on what will clearly be an extremely expensive venture. But they said that with help from international partners and perhaps space businesses, the agency would have sufficient funds to undertake the plan without any dramatic infusion of new money."