Skip to main content

NASA completes prelaunch test of its mega moon rocket

NASA has completed what may have been the final ground test of its next-generation Space Launch System (SLS) rocket before its much-anticipated maiden mission to the moon.

It comes after a failed attempt at the same so-called “wet dress rehearsal” in April, when a number of issues caused the test to be called off.

Recommended Videos

Monday’s crucial test took place at Launch Pad 39B at the Kennedy Space Center in Florida, starting in the morning and concluding at 7:37 p.m. ET.

The entire procedure took about 12 hours and marked the first time for the SLS rocket’s propellant tanks to be fully loaded with fuel. The test ended with a mock countdown, a critical period of any rocket launch when many activities take place in rapid succession.

Today's #Artemis I wet dress rehearsal activities concluded after a modified countdown configuration and successfully adding propellant to the rocket. We will review the data and are meeting to discuss next steps. For updates: https://t.co/rZxnWJ0Kbi pic.twitter.com/dKtFZeVWDF

— NASA (@NASA) June 21, 2022

As the test has only just finished, information on how it went is scarce. Indeed, NASA is now analyzing the data gathered during the test to determine if it can launch the rocket and Orion spacecraft toward the moon in late August, or if more work needs to be carried out on the vehicle.

An initial NASA report released about an hour after the test finished suggested that overall it went well, though it wasn’t all smooth sailing.

The agency said that during propellant loading operations early on Monday, engineers spotted a hydrogen leak in a component that attaches an umbilical from the tail service mast on the mobile launcher to the SLS rocket’s core stage. April’s test also featured a hydrogen leak though it’s not yet clear if the two issues are linked.

NASA said it tried to repair Monday’s leak using a warming and chilling process to realign the seals, but the effort failed. Determined to proceed with the test, engineers found a way to mask the leak-related data that in a real launch situation would have prompted the computer to pause the countdown.

The engineers’ actions enabled the team to “resume with the final 10 minutes of the countdown, called terminal count. During the terminal count, the teams performed several critical operations that must be accomplished for launch including switching control from the ground launch sequencer to the automated launch sequencer controlled by the rocket’s flight software, an important step that the team wanted to accomplish.”

The test clearly went better than the effort in April, but NASA will have to address the valve problem, among other issues that may have surfaced during Monday’s procedure.

NASA will provide a full account of the test at a media teleconference at 11 a.m. ET on Tuesday, June 21. You can watch the broadcast on the video player below or via NASA’s website.

The space agency will use the SLS rocket to power the Orion spacecraft on an uncrewed flyby of the moon in the Artemis I mission, which could launch in late August. Artemis II will send a crew on the same flight path, while Artemis III will put the first woman and first person of color on the lunar surface in a mission that will herald a new era of human space exploration.

NASA Live: Official Stream of NASA TV
Trevor Mogg
Contributing Editor
Not so many moons ago, Trevor moved from one tea-loving island nation that drives on the left (Britain) to another (Japan)…
NASA agreement with oil company BP could see its technology used on moon
An artist’s concept of an Artemis astronaut deploying an instrument on the lunar surface.

While its technology is most often used to drill for oil here on Earth, oil company BP has entered into an agreement with NASA that could see its technology used to drill for resources on the moon.

The agreement was announced this week, and says the company will work with NASA to "support common goals in space exploration and energy production." That involved sharing technology and technical expertise, particularly about how energy production can operate in extreme environments. This could be applicable to future NASA plans for exploration of the moon and Mars, both of which will require significant power generation.

Read more
NASA’s axed moon rover could be resurrected by Intuitive Machines
An illustration of NASA's Volatiles Investigating Polar Exploration Rover (VIPER) on the lunar surface.

Lunar scientists were shocked and dismayed last month when NASA announced that it was canceling work on its moon rover, VIPER. The Volatiles Investigating Polar Exploration Rover was intended to search the moon's south pole for evidence of water there, but NASA said that it had to ax the project due to increasing costs.

This week, an open letter to Congress called the cancellation of the mission "unprecedented and indefensible," and questioned NASA's assertion that the cancellation of the mission would not affect plans to send humans to the moon. Scientists argued that the mission was fundamental to understanding the presence of water on the moon, which is a key resource for human exploration, as well as an issue of scientific interest.

Read more
NASA’s Space Launch System rocket arrives at Kennedy. Next stop: the moon
After completing its journey from NASA’s Michoud Assembly Facility aboard the Pegasus barge, teams with Exploration Ground Systems transport the agency’s powerful SLS (Space Launch System) core stage to NASA’s Kennedy Space Center’s Vehicle Assembly Building on July 23.

After completing its journey from NASA’s Michoud Assembly Facility aboard the Pegasus barge, teams with Exploration Ground Systems transport the agency’s powerful SLS (Space Launch System) core stage to NASA’s Kennedy Space Center’s Vehicle Assembly Building on July 23. NASA/Isaac Watson

NASA's epic Space Launch System rocket, standing 322 feet tall when fully stacked, has recently been on an similarly epic journey -- traveling from New Orleans to Florida via barge. The rocket began its journey more than two weeks ago, and having covered more than 900 miles has now arrived safe at the Kennedy Space Center.

Read more