NASA, the American space agency, has unveiled plans for one of the largest rockets ever built to take a manned mission to the far side of the moon.

It will ferry a mother ship and lunar lander into Earth orbit to link up with a smaller rocket carrying the crew. Once united they will head for the moon where the larger ship will remain in orbit after launching the lunar lander and crew.

The design emerged during a space science conference in Houston, Texas, last week. The plan is part of Nasa’s “Return to the Moon” programme set in motion by President George W Bush two years ago.

Under the project, up to four astronauts at a time will land on the far side of the moon to collect rock samples and carry out research, including looking for water that might one day support a lunar base.

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