The U.S. is studying a possible manned mission around the moon as early as next year, marking the first such trip since the Apollo era ended in the early 1970s.

Following requests from the White House, the National Aeronautics and Space Administration has formed a team to examine accelerating earlier plans to launch a crew by 2021, William Gerstenmaier, associate administrator of the agency’s Human Exploration and Operations Mission Directorate, said Friday. Preliminary results of the review should be ready in about a month.

“We have a good, crisp list of all the things we would physically have to change” on the launch vehicle under development, Gerstenmaier said on a conference call with reporters. “We asked the team to take a look at potentially what additional tests would be needed to add crew, what the additional risk would be.”

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