NASA has postponed the launch of the Artemis II mission to the Moon, initially scheduled for March 6, to an undetermined date, potentially in April. The space agency announced that the Space Launch System rocket and the Orion spacecraft will be rolled back from the launchpad and returned to the Vehicle Assembly Building (VAB) at the Kennedy Space Center in Florida on Tuesday, February 24, weather permitting.
The latest issue centers around “helium flow in the rocket’s intermediate propulsion stage.” According to the Canadian Space Agency (CSA), “Helium bottles in this stage are used to drain the engines as well as to pressurize the liquid hydrogen and liquid oxygen tanks.”
Both countdown rehearsals conducted in February proceeded without issue. However, during a routine pressurization operation carried out overnight on February 21, the team was unable to achieve a consistent helium flow to the vehicle, the CSA explained.
Once the rocket is back at the VAB, engineers will work to identify “potential sources of this failure” and carry out the necessary repairs, preventing a March launch. NASA indicates an April launch remains possible, dependent on the time required to resolve the problem. Launch opportunities are limited to a few days each month, known as launch windows, which are dictated by the Moon’s position relative to the rocket’s trajectory.
This setback follows recent successful repairs to hydrogen leaks that had previously caused a delay to the mission. The Artemis program represents a significant step in renewed lunar exploration, and the technology developed will likely have broader applications in space travel and resource management.
“Everything worked correctly during the two countdown simulations carried out in February,” the CSA stated. “However, during a routine pressurization operation carried out during the night of February 21, the team was unable to obtain a continuous flow of helium into the vehicle.”
