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By NASA
NASA’s Artemis II SLS (Space Launch System) rocket poised to send four astronauts from Earth on a journey around the Moon next year may appear identical to the Artemis I SLS rocket. On closer inspection, though, engineers have upgraded the agency’s Moon rocket inside and out to improve performance, reliability, and safety.
SLS flew a picture perfect first mission on the Artemis I test flight, meeting or exceeding parameters for performance, attitude control, and structural stability to an accuracy of tenths or hundredths of a percent as it sent an uncrewed Orion thousands of miles beyond the Moon. It also returned volumes of invaluable flight data for SLS engineers to analyze to drive improvements.
Teams with NASA’s Exploration Ground Systems integrate the SLS (Space Launch System) Moon rocket with the solid rocket boosters onto mobile launcher 1 inside High Bay 3 of the Vehicle Assembly Building at NASA’s Kennedy Space Center in March 2025. Artemis II is the first crewed test flight under NASA’s Artemis campaign and is another step toward missions on the lunar surface and helping the agency prepare for future human missions to Mars.NASA/Frank Michaux For Artemis II, the major sections of SLS remain unchanged – a central core stage, four RS-25 main engines, two five-segment solid rocket boosters, the ICPS (interim cryogenic propulsion stage), a launch vehicle stage adapter to hold the ICPS, and an Orion stage adapter connecting SLS to the Orion spacecraft. The difference is in the details.
“While we’re proud of our Artemis I performance, which validated our overall design, we’ve looked at how SLS can give our crews a better ride,” said John Honeycutt, NASA’s SLS Program manager. “Some of our changes respond to specific Artemis II mission requirements while others reflect ongoing analysis and testing, as well as lessons learned from Artemis I.”
Engineers have outfitted the ICPS with optical targets that will serve as visual cues to the astronauts aboard Orion as they manually pilot Orion around the upper stage and practice maneuvers to inform docking operations for Artemis III.
The Artemis II rocket includes an improved navigation system compared to Artemis I. Its communications capability also has been improved by repositioning antennas on the rocket to ensure continuous communications with NASA ground stations and the U.S. Space Force’s Space Launch Delta 45 which controls launches along the Eastern Range.
An emergency detection system on the ICPS allows the rocket to sense and respond to problems and notify the crew. The flight safety system adds a time delay to the self-destruct system to allow time for Orion’s escape system to pull the capsule to safety in event of an abort.
The separation motors that push the solid rocket booster away after the elements are no longer needed were angled an additional 15 degrees to increase separation clearance as the rest of the rocket speeds by.
Additionally, SLS will jettison the spent boosters four seconds earlier during Artemis II ascent than occurred during Artemis I. Dropping the boosters several seconds closer to the end of their burn will give engineers flight data to correlate with projections that shedding the boosters several seconds sooner will yield approximately 1,600 pounds of payload to Earth orbit for future SLS flights.
Engineers have incorporated additional improvements based on lessons learned from Artemis I. During the Artemis I test flight the SLS rocket experienced higher-than-expected vibrations near the solid rocket booster attachment points that was caused by unsteady airflow.
To steady the airflow, a pair of six-foot-long strakes flanking each booster’s forward connection points on the SLS intertank will smooth vibrations induced by airflow during ascent, and the rocket’s electronics system was requalified to endure higher levels of vibrations.
Engineers updated the core stage power distribution control unit, mounted in the intertank, which controls power to the rocket’s other electronics and protects against electrical hazards.
These improvements have led to an enhanced rocket to support crew as part of NASA’s Golden Age of innovation and exploration.
The approximately 10-day Artemis II test flight is the first crewed flight under NASA’s Artemis campaign. It is another step toward new U.S.-crewed missions on the Moon’s surface that will help the agency prepare to send the first astronauts – Americans – to Mars.
https://www.nasa.gov/artemis
News Media Contact
Jonathan Deal
Marshall Space Flight Center, Huntsville, Ala.
256.631.9126
jonathan.e.deal@nasa.gov
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Last Updated Sep 17, 2025 EditorLee MohonContactJonathan DealLocationMarshall Space Flight Center Related Terms
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By NASA
Curiosity Navigation Curiosity Home Mission Overview Where is Curiosity? Mission Updates Science Overview Instruments Highlights Exploration Goals News and Features Multimedia Curiosity Raw Images Images Videos Audio Mosaics More Resources Mars Missions Mars Sample Return Mars Perseverance Rover Mars Curiosity Rover MAVEN Mars Reconnaissance Orbiter Mars Odyssey More Mars Missions Mars Home 3 min read
Curiosity Blog, Sols 4609–4610: Recharged and Ready To Roll Onwards
NASA’s Mars rover Curiosity acquired this image showing the boxwork hollow where it is investigating, and the boxwork ridge on the far side of the hollow, using its Left Navigation Camera. Curiosity captured the image on July 20, 2025 — Sol 4605, or Martian day 4,605 of the Mars Science Laboratory mission — at 18:51:55 UTC. NASA/JPL-Caltech Written by Catherine O’Connell-Cooper, Planetary Geologist at University of New Brunswick
Earth planning date: Wednesday, July 23, 2025
For today’s planning, we were in the same workspace as the Monday plan — on purpose! We don’t often have a plan without a drive but in order to allow the battery to recover from some power-hungry SAM atmospheric measurements over the weekend and on Monday, we needed to stay put and skip our usual drive. As a result, we gained a bonus planning cycle at this interesting workspace.
We are in one of the “hollows” between the resistant ridges of the “boxwork” terrain, as you can see in the image for this blog. This made for a quieter Operations day for me as the APXS planner. As Deborah noted in Monday’s blog, we have already gotten three APXS and MAHLI measurements in this workspace, so we didn’t acquire more in this plan.
This morning, we focused on documenting some small light-toned, rounded, white pebbles in the workspace (you can see them in the accompanying Navcam image), which look very different from the underlying bedrock. We used our one ChemCam LIBS analysis for the plan on “Yana Qaqa.” Mastcam will image this pebble, another at “Ojos del Salado,” and a really cool-looking target with a dendritic-looking texture at “Punta de Lobos.”
Further afield, Mastcam will image the adjacent boxwork ridge and hollow in our drive direction, and a series of troughs with raised edges to the right of our current workspace. ChemCam will image a long-distance RMI mosaic of “Cueva de los Vencejos y Murciélagos,” which was imaged by Mastcam on Monday, and also acquire some further images of the “Mishe Mokwa” hill.
We had a bumper couple of sols of atmospheric measurements over the weekend and Monday. Now we revert back to our more normal environmental and atmospheric monitoring. These do not get as much attention sometimes as the amazing images we take of the fascinating rocks we see, but have been taking place consistently and continuously since Curiosity’s landing almost 13 years ago now. This plan includes a series of Navcam movies (suprahorizon, dust devil) and a line-of-sight observation of dust, standard REMS and DAN observations, and two Mastcam tau measurements, looking at dust in the atmosphere.
Our 24-meter drive (almost 79 feet) will take us out of this hollow and back up on top of a ridge. From here, we hope to be able to spy the best driving path through the boxwork. The ridges are up to 5 meters in diameter (about 16 feet), so we are cautiously hopeful that we can just trundle along one of the ridges as we investigate this fascinating terrain.
For more Curiosity blog posts, visit MSL Mission Updates
Learn more about Curiosity’s science instruments
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Last Updated Jul 28, 2025 Related Terms
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