Hurricane Ian is prompting NASA to move its moon rocket off the launch pad and into shelter, adding weeks of delay to the lunar-orbiting test flight.

Mission managers decided Monday to return the rocket to its Kennedy Space Center hangar, called the Vehicle Assembly Building (VAB). The 6.5-kilometre trip will begin late Monday night and could take as long as 12 hours.

The space centre remained on the fringes of the hurricane’s cone of uncertainty. With the latest forecast showing no improvement, managers decided to play it safe. NASA already had delayed this week’s planned launch attempt because of the approaching storm.

NASA isn’t speculating when the next launch attempt might be, but it could be off until November. Managers will assess their options once the 98-metre Space Launch System rocket is safely back in the hangar.

Due to weather predictions related to Hurricane Ian, @NASA teams will roll the #Artemis I @NASA_SLS rocket and @NASA_Orion spacecraft back to the Vehicle Assembly Building at @NASAKennedy.

First motion is targeted for 11 pm ET tonight: https://t.co/Bx7oanmpa4 pic.twitter.com/wwPds84R36

@NASAArtemis

A pair of launch attempts were thwarted by hydrogen fuel leaks and other technical trouble at the end of August and beginning of September.

The $4.1 billion US test flight will kick off NASA’s return to the moon since the Apollo moonshots of the 1960s and 1970s. No one will be inside the crew capsule for the debut launch. Astronauts — including one Canadian — will strap in for the second mission in 2024, leading to a two-person moon landing in 2025.