Skip to main content

NASA still struggling to fuel its Space Launch System rocket

NASA has been performing ongoing tests of its new Space Launch System, also known as the Mega Moon Rocket, which is intended to power an uncrewed trip to the moon later this year and, eventually, to carry humans back to the moon as well. The agency has encountered a variety of issues during the testing process, and it recently attempted a third, modified version of its wet dress rehearsal, but that was called off partway through once again.

NASA has said that the issues it is encountering are not big design problems but rather smaller, technical problems. In a press conference this Friday, April 15, it said it may attempt the test once again as soon as this Thursday, April 21.

NASA’s Space Launch System (SLS) rocket with the Orion spacecraft aboard is seen atop a mobile launcher at Launch Complex 39B.
NASA’s Space Launch System (SLS) rocket with the Orion spacecraft aboard is seen atop a mobile launcher at Launch Complex 39B, Monday, April 4, 2022. NASA/Joel Kowsky

The most recent version of the test, in which the rocket is rolled out to the launch pad and is filled with liquid propellant, was modified from previous efforts to focus on using the ground systems to fill the rocket’s core stage tanks, rather than trying to fill the upper stage as well. However, even with this modified test, there were still issues, following a fan issue in the first test and a stuck valve in the second test. In the most recent test, the team identified a liquid hydrogen leak and had to call the test off. Liquid hydrogen is one of the two fuels used, along with liquid oxygen.

Recommended Videos

“Engineers encountered a liquid hydrogen leak on the tail service mast umbilical that prevented the team from completing the test,” NASA wrote. “Before ending the test, teams were able to collect additional data by chilling down the lines used to load propellant into the upper stage. The rocket remains in a safe configuration as teams assess next steps.”

The core stage liquid oxygen tank was filled almost halfway when the test was called off, the agency wrote in an update, and the liquid hydrogen tank was filled to around 5% of its capacity. Seeing the leak, the team had to then drain the propellant back out of the rocket to find the source of the leak.

In its press conference, NASA Artemis mission manager Mike Sarafin said the team could try the test again as early as this Thursday, but they would have to work around a busy schedule at Kennedy Space Center, including the launch of the Crew-4 SpaceX Crew Dragon mission to the International Space Station on Saturday, April 23.

Georgina Torbet
Georgina has been the space writer at Digital Trends space writer for six years, covering human space exploration, planetary…
How to watch SpaceX launch private Fram2 mission tonight
SpaceX's Fram2 crew, set for launch in March 2025.

SpaceX is about to launch its first private human spaceflight mission in nearly seven months.

The mission, set to lift off on Monday evening, will use a Falcon 9 rocket and Crew Dragon spacecraft to send four civilians into a polar orbit, in what will be a first for a human spaceflight mission.

Read more
Watch this SpaceX rival launch its third mission in two weeks
Rocket Lab launches an Electron rocket.

New Zealand-based Rocket Lab has launched its third satellite-deployment mission in two weeks, marking a new record for the up-and-coming SpaceX rival.

The Finding Hot Wildfires Near You mission lifted off from Rocket Lab Launch Complex 1, Pad B, in Mahia, New Zealand, on Wednesday local time.

Read more
It’s not aliens, it’s just SpaceX: scientists figure out strange spiral in the sky
spiral in the sky spacex falcon 9 gm1zltqxcaa9pia

A strange swirl in the sky seen over much of Britain and Europe this week wasn't the result of alien activity but rather a SpaceX Falcon 9 rocket. The UK's Met Office, which monitors weather conditions in Britain, announced that the striking vision seen overhead was not a cause for concern but the result of a rocket launch.

"We've received many reports of an illuminated swirl in the sky this evening," the Met Office wrote on X, sharing various images of the swirl. "This is likely to be caused by the SpaceX Falcon 9 rocket, launched earlier today. The rocket's frozen exhaust plume appears to be spinning in the atmosphere and reflecting the sunlight, causing it to appear as a spiral in the sky"

Read more