Key Points
- Four astronauts splashed down in Pacific Ocean after 10-day lunar flyby mission
- Service module propulsion leak worsened during flight requiring extensive redesign
- Toilet system malfunctions forced crew to use backup plastic bag method
Four astronauts returned to Earth on Friday after completing NASA’s Artemis II mission, the first crewed lunar flyby in more than five decades. The Orion spacecraft splashed down in the Pacific Ocean off California at 5:37am IST on Saturday, concluding a 10-day journey that carried the crew farther from Earth than any humans before.
The mission tested critical systems ahead of NASA’s planned lunar landing missions. However, engineers identified several technical problems, including a worsening propulsion system leak, that will require significant repairs before future flights.
EVENT
Infosec Reimagined
Infosec Reimagined 2026 is the premier information security summit where top leaders—CISOs, CROs, CIOs, CTOs and risk executives—converge to redefine cyber resilience.
EVENT
CIO Prism
CIO Prism unites forward-thinking technology leaders to exchange transformative insights, shape digital strategies, and foster innovation, empowering enterprises to excel in an era of rapid technological change.
For Indian space watchers, the mission offered valuable insights into deep-space crewed exploration. India‘s Gaganyaan programme, which aims to send astronauts to low Earth orbit, could benefit from lessons learned during Artemis II’s extended spaceflight.
Crew composition and mission achievement
The Orion capsule carried NASA astronauts Reid Wiseman, Victor Glover and Christina Koch alongside Jeremy Hansen of the Canadian Space Agency. All four returned safely after setting a new record for the farthest distance travelled by humans from Earth.
“Mission well accomplished,” said Jared Isaacman, NASA Administrator, shortly after splashdown.
Throughout the flight, the crew shared unprecedented imagery of the Moon and captured a solar eclipse from their unique vantage point in deep space. Cameras mounted on the capsule, 15 in total, along with 17 handheld devices operated by the astronauts, provided continuous views of life aboard the spacecraft.
Service module leak poses concern for future missions
The most significant technical issue involved Orion’s service module, the cylindrical structure at the base of the crew capsule that provides oxygen, power and propulsion. A leak in the propulsion system affected the pressurisation of propellant tanks.
NASA was aware of potential leaks before launch but believed the problem was limited. The leak worsened considerably when the service module fired its main engine for the translunar injection burn, the manoeuvre that sent the spacecraft towards the Moon, on Day 2 of the flight.
Advertisement
“The leak grew by an order of magnitude during the flight versus what was expected,” said Amit Kshatriya, NASA’s Associate Administrator.
Kshatriya confirmed that the service module will require an ‘extensive redesign’ of the valve system before future Artemis flights. While the issue did not endanger the Artemis II crew, it represents a substantial engineering challenge for the programme.
Toilet troubles and sensor warnings
Among the less critical but notable problems, the spacecraft’s toilet system repeatedly malfunctioned. Wastewater failed to vent properly outside the capsule, leaving the toilet unusable when the storage tank reached capacity. The backup option required astronauts to use plastic bags.
NASA has committed to resolving the toilet issues before the next Orion flight. The exact cause of the malfunction remains under investigation.
Throughout the mission, Orion’s warning systems also triggered alerts due to faulty sensors. Mission controllers stated these sensor issues were not a major concern and did not affect crew safety or mission objectives.
Life inside the capsule
The mission provided rare glimpses into daily routines aboard a deep-space vehicle roughly the size of a campervan. Astronauts exercised regularly and shared meals while floating in microgravity.
Without access to conventional showers, crew members used no-rinse shampoo and disposable wipes to maintain hygiene. Each astronaut received a personal kit containing baby wipes, toothbrushes and shaving accessories.
The crew noted several items they would bring on future missions, including warmer sleeping bags. One of the onboard computers also malfunctioned during the flight, prompting suggestions that a spare unit should be included on subsequent journeys.
In a poignant moment during the mission, the crew named a lunar crater after Carroll, the late wife of Commander Reid Wiseman.
Your Questions, Answered
What was the Artemis II mission?
Artemis II was NASA’s first crewed lunar flyby mission in over 50 years. Four astronauts orbited the Moon during a 10-day flight to test systems ahead of planned lunar landing missions.
What technical problems occurred during Artemis II?
The main issue was a propulsion system leak in the service module that worsened during flight. The toilet system also malfunctioned and some sensors triggered false warnings.
Who were the astronauts on Artemis II?
The crew comprised NASA astronauts Reid Wiseman, Victor Glover and Christina Koch, along with Jeremy Hansen from the Canadian Space Agency.
What happens after Artemis II?
NASA will review mission data and redesign the service module’s valve system to fix the propulsion leak. The agency will then proceed with preparations for Artemis III, which aims to land astronauts on the Moon.