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WEDNESDAY, MAY 28, 2025
NASA ready for second attempt at Artemis lunar launch

Science

Reuters
03 September, 2022, 11:35 am
Last modified: 03 September, 2022, 11:39 am

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NASA ready for second attempt at Artemis lunar launch

Reuters
03 September, 2022, 11:35 am
Last modified: 03 September, 2022, 11:39 am
NASA's next-generation moon rocket, the Space Launch System (SLS) with the Orion crew capsule perched on top, stands on launch complex 39B as rain clouds move into the area before its rescheduled debut test launch for the Artemis 1 mission at Cape Canaveral, Florida, U.S. September 2, 2022. REUTERS/Joe Skipper
NASA's next-generation moon rocket, the Space Launch System (SLS) with the Orion crew capsule perched on top, stands on launch complex 39B as rain clouds move into the area before its rescheduled debut test launch for the Artemis 1 mission at Cape Canaveral, Florida, U.S. September 2, 2022. REUTERS/Joe Skipper

Ground teams at Kennedy Space Center prepared on Saturday for a second try at launching NASA's towering, next-generation moon rocket on its debut flight, hoping to have remedied engineering problems that foiled the initial countdown five days earlier.

The 32-story tall Space Launch System (SLS) rocket and its Orion capsule were due for blastoff from Cape Canaveral, Florida, at 2:17 pm EDT (1817 GMT), kicking off NASA's ambitious moon-to-Mars program Artemis program 50 years after the last Apollo lunar mission.

The previous launch bid on Monday ended with technical problems forcing a halt to the countdown and postponement of the uncrewed flight.

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Tests indicated technicians have since fixed a leaky fuel line that contributed to Monday's canceled launch, Jeremy Parsons, a deputy program manager at the space center, told reporters on Friday.

Two other key issues on the rocket itself - a faulty engine temperature sensor and some cracks in insulation foam - have been resolved to NASA's satisfaction, Artemis mission manager Mike Sarafin told reporters Thursday night.

Weather is always an additional factor beyond NASA's control. The latest forecast called for a 70% chance of favorable conditions during Saturday's two-hour launch window, according to the US Space Force at Cape Canaveral.

If the countdown clock were halted again, NASA could reschedule another launch attempt for Monday or Tuesday.

Dubbed Artemis I, the mission marks the first flight for both the SLS rocket and the Orion capsule, built under NASA contracts with Boeing Co and Lockheed Martin Corp, respectively.

It also signals a major change in direction for NASA's post-Apollo human spaceflight program, after decades focused on low-Earth orbit with space shuttles and the International Space Station.

Named for the goddess who was Apollo's twin sister in ancient Greek mythology, Artemis aims to return astronauts to the moon's surface as early as 2025.

Twelve astronauts walked on the moon during six Apollo missions from 1969 to 1972, the only spaceflights yet to place humans on the lunar surface. But Apollo, born of the US-Soviet space race during the Cold War, was less science-driven than Artemis.

The new moon program has enlisted commercial partners such as SpaceX and the space agencies of Europe, Canada and Japan to eventually establish a long-term lunar base of operations as a stepping stone to even more ambitious human voyages to Mars.

Getting the SLS-Orion spacecraft off the ground is a key first step. Its first voyage is intended to put the 5.75-million-pound vehicle through its paces in a rigorous test flight pushing its design limits and hopefully proving the spacecraft suitable to fly astronauts.

If the mission succeeds, a crewed Artemis II flight around the moon and back could come as early as 2024, to be followed within a few more years with the program's first lunar landing of astronauts, one of them a woman, with Artemis III.

Billed as the most powerful, complex rocket in the world, the SLS represents the biggest new vertical launch system the US space agency has built since the Saturn V of the Apollo era.

Barring last-minute difficulties, Saturday's countdown should end with the rocket's four main R-25 engines and its twin solid-rocket boosters igniting to produce 8.8 million pounds of thrust, about 15% more thrust the Saturn V, sending the spacecraft streaking skyward.

About 90 minutes after launch, the rocket's upper stage will thrust Orion out of Earth orbit on course for a 37-day flight that brings it to within 60 miles of the lunar surface before sailing 40,000 miles (64,374 km) beyond the moon and back to Earth. The capsule is expected to splash down in the Pacific on 11 Oct.

Although no humans will be aboard, Orion will be carrying a simulated crew of three - one male and two female mannequins - fitted with sensors to measure radiation levels and other stresses that real-life astronauts would experience.

A top objective for the mission is to test the durability of Orion's heat shield during re-entry as it hits Earth's atmosphere at 24,500 miles (39,429 km) per hour, or 32 times the speed of sound, on its return from lunar orbit - much faster than more common re-entries of capsules returning from Earth orbit.

The heat shield is designed to withstand re-entry friction expected to raise temperatures outside the capsule to nearly 5,000 degrees Fahrenheit (2,760 Celsius).

More than a decade in development with years of delays and budget overruns, the SLS-Orion spacecraft has so far cost NASA least $37 billion, including design, construction, testing and ground facilities. NASA's Office of Inspector General has projected total Artemis costs will run to $93 billion by 2025.

NASA defends the program as a boon to space exploration that has generated tens of thousands of jobs and billions of dollars in commerce.

World+Biz / USA

NASA / US / Artemis

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