NASA is going back to the moon — somehow, someway. The White House has ordered the agency to put American boots back on the lunar surface. The major unknowns at this point include the when, how, scale of the operation and cost. Also unclear is what exactly NASA would accomplish with such a mission and how it might affect plans for a human mission to Mars.

NASA put 12 astronauts on the moon between 1969 and 1972. With the death Friday of Apollo 16’s John Young, only five of those astronauts are still alive, and they range in age from 82 to 87. No human being has been beyond low Earth orbit since the end of the Apollo program.

NASA acting administrator Robert Lightfoot told The Washington Post that the agency will partner with other countries in the return to the moon, but he did not say which ones. He said the moon plan will be a public-private partnership, but did not name any companies that might be involved. Details will emerge with the president’s annual budget request to Congress, he said. He provided no specifics about the architecture of a moon program.

“We have no idea yet,” Lightfoot said.

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