Tag: SLS

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Cosmic Space

Moon rocket returns to launch pad for rehearsal rerun

SLS rolls out to launch pad
NASA's Space Launch System rocket arrives at its pad at Kennedy Space Center for a launch rehearsal. (NASA Photo)

NASA’s heavy-lift Space Launch System rocket is back at Kennedy Space Center’s Launch Complex 39B for another dress rehearsal aimed at clearing the way for a round-the-moon mission.

This time, NASA hopes the full-up rehearsal will include a fill-up.

The SLS rocket had its first rollout to the pad in mid-March, and NASA went through several rounds of pre-launch tests in April. But the team wasn’t able to fill the rocket’s tanks with super-chilled hydrogen and oxygen propellants due to a series of problems.

NASA had to transport the 322-foot-tall, 3.5 million-pound rocket back to the Vehicle Assembly Building and fix the glitches. Early today, the rocket made the 4-mile, eight-hour journey back to the pad to begin preparations for another “wet dress rehearsal,” including the tank-filling operation.

You can watch a live video feed of the SLS on the pad via Kennedy Space Center’s YouTube channel.

If all goes according to plan, NASA will go all the way through the countdown to the moment of ignition in two weeks. And if the reviews of the rehearsal are sufficiently glowing, the first-ever SLS launch would send NASA’s Orion spaceship on an uncrewed mission around the moon and back in August.

That mission, known as Artemis 1, could be considered a robotic rehearsal for a crewed Artemis 2 mission around the moon. The Artemis 2 launch is scheduled for no earlier than 2024. NASA’s plan calls for the mission after that, Artemis 3, to land astronauts on the lunar surface for the first time since Apollo 17 — 50 years ago.

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Cosmic Space

NASA rolls back its SLS moon rocket to make repairs

SLS on trip back to Vehicle Assembly Building
NASA's Space Launch System rocket departs Launch Complex 39B at Kennedy Space Center. (United Launch Alliance Photo / Ben Cooper)

NASA brought its Space Launch System rocket back to one of the world’s biggest repair shops — the 526-foot-tall Vehicle Assembly Building at Kennedy Space Center in Florida — to fix some flaws that turned up during rehearsals for a mission beyond the moon.

It took 10 hours to roll the 322-foot-tall, 3.5 million-pound rocket on its mobile launch platform from Launch Complex 39B to the VAB. The 4-mile journey, which made use of a giant crawler-transporter handed down from the Apollo and space shuttle programs, was basically a rewind of the rocket’s trip to the pad on March 17-18.

NASA had hoped to conduct a “wet dress rehearsal” for the launch of the SLS and its Orion deep-space capsule on an uncrewed trip around the moon. That mission, known as Artemis 1, is meant to set the stage for a crewed round-the-moon mission in 2024 and the first crewed landing on the moon since the Apollo era in 2025 or 2026.

Unfortunately for NASA, the practice runs came across some issues that need to be addressed in the days and weeks ahead.

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Cosmic Space

The stage is set for NASA moon rocket’s rehearsal

SLS and Orion on launch pad
NASA's Space Launch System rocket, topped by an Orion capsule, sits on its launch pad in Florida. ((NASA/Aubrey Gemignani)

For the first time in nearly 50 years, a NASA rocket capable of sending humans to the moon is sitting on its launch pad.

The overnight rollout of NASA’s Space Launch System rocket, topped by an Orion capsule, evoked memories of the Saturn V rocket launches that sent Apollo astronauts to the moon from Kennedy Space Center in Florida between 1968 and 1972.

The SLS is being prepared for a monthlong test mission known as Artemis 1, which will send the Orion on an uncrewed flight around the moon and back. That flight, currently set for the May-June time frame, is due to be followed by a crewed round-the-moon mission in 2024, and then a mission to send astronauts to lunar surface in 2025.

The precise timing of all these missions depends on the outcome of on-the-ground tests of the multibillion-dollar rocket. Those tests are due to take place over the next couple of weeks and come to a climax next month with a dress rehearsal for launch.

The stage for the rehearsal was set when the 322-foot-tall, 3.5 million-pound rocket rolled out of Kennedy Space Center’s giant Vehicle Assembly Building on a crawler-transporter that was retooled from the space shuttle era. After a trek that took nearly 11 hours, the rocket was fixed in place at around 4:15 a.m. ET (1:15 a.m. PT) today at Launch Complex 39B, which was first used for Apollo 10’s launch in 1969.

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Universe Today

NASA’s first Artemis moon landing slips to 2025

SpaceX Starship on the moon
An artist’s conception shows SpaceX’s Starship rocket ship on the moon. (SpaceX Illustration)

NASA has pushed back the timetable for landing astronauts on the moon for the first time in more than a half-century from 2024 to no earlier than 2025.

Blue Origin’s unsuccessful legal challenge to a $2.9 billion lunar lander contract awarded to SpaceX was one of the factors behind the delay in the Artemis moon program, NASA Administrator Bill Nelson said during a Nov. 9 teleconference.

Nelson also pointed to Congress’ previous decisions not to fund the lander program as fully as NASA wanted, plus delays forced by the COVID-19 pandemic and the fact that “the Trump administration target of a 2024 human landing was not grounded in technical feasibility.”

“After having taken a good look under the hood these past six months, it’s clear to me that the agency will need to make serious changes for the long-term success of the program,” he told reporters.

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GeekWire

Next NASA chief faces big moonshot decisions

Bill Nelson checks out Starliner mockup at Kennedy Space Center in 2014
Bill Nelson checks out a Boeing Starliner mockup with former astronaut Chris Ferguson as his guide in 2014. (NASA Photo)

President Joe Biden’s choice to lead NASA — former U.S. Sen. Bill Nelson — will be in the hot seat for a host of issues in human spaceflight that will require a tricky balance between “Old Space” and “New Space.”

Nelson is a 78-year-old Florida Democrat who went on a space shuttle flight as a congressman in 1986, and served three terms in the Senate before his defeat in 2018. In today’s statement announcing his nomination, the White House said that Nelson “was known as the go-to senator for our nation’s space program,” and that “most every piece of space and science law has had his imprint.”

“I am honored to be nominated by Joe Biden and, if confirmed, to help lead NASA into an exciting future of possibilities,” Nelson said in a statement. “Its workforce radiates optimism, ingenuity and a can-do spirit. The NASA team continues to achieve the seemingly impossible as we venture into the cosmos.”

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Cosmic Space

NASA’s SLS rocket completes engine test on second try

Clouds of exhaust rise from a hot-fire test of the Space Launch System's core stage. (Boeing via YouTube)

Two months after an initial hot-fire test ended prematurely, the four engines on the core stage of NASA’s heavy-lift Space Launch System were fired up for the full duration of eight minutes today.

The successful engine test marks a major milestone for the rocket that’s due to get an uncrewed round-the-moon test flight off the ground late this year or in early 2022 — and for an Artemis program that’s due to put astronauts on the lunar surface in the mid-2020s.

“The SLS is the most powerful rocket NASA has ever built, and during today’s test the core stage of the rocket generated more than 1.6 million pounds of thrust within seven seconds,” acting NASA Administrator Steve Jurczyk said in a news release. “The SLS is an incredible feat of engineering and the only rocket capable of powering America’s next-generation missions that will place the first woman and the next man on the moon.”

The Aerojet Rocketdyne RS-25 rocket engines are holdovers from the space shuttle program that have been refurbished for reuse on the SLS. Those engines consume more than 733,000 gallons of super-chilled liquid hydrogen and oxygen for their full duration.

During Jan. 16’s “Green Run” test at NASA’s Stennis Space Center in Mississippi, the SLS core stage’s RS-25 engines fired for a little more than a minute before shutting themselves down. Engineers determined that the shutdown occurred when pressure in a hydraulic system exceeded its conservative pre-set limits. Adjustments were made for today’s second test at Stennis.

This time around, the engines fired for 499.6 seconds straight, achieving 109% of the power that would be required during the 212-foot-tall booster’s eight-minute ascent to Earth orbit. The engines were also put through a series of movements in specific patterns to direct their thrust.

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Cosmic Space

NASA’s moon rocket test ends early, raising questions

Steam billows from the RS-25 engines on the Space Launch System's core stage during a hot-fire test. (NASA Photo)

NASA’s first full-up, on-the-ground test for the main engines on its heavy-lift Space Launch System rocket ended prematurely today due to an automated shutdown.

“Today was an important day,” NASA Administrator Jim Bridenstine said after the test. “I know not everybody is feeling as happy as we otherwise could, because we wanted to get eight minutes of a hot fire, and we got over a minute.”

Despite the early shutdown,  NASA said the “Green Run” engine test produced valuable data in preparation for the first honest-to-goodness SLS launch, currently set for late this year.

That launch would kick off an uncrewed round-the-moon trip for NASA’s Orion spacecraft. The mission, known as Artemis 1, is a key step in the plan to send astronauts around the moon on NASA’s Artemis 2 mission in the 2023 time frame, and then put them on the lunar surface by as early as 2024 during the Artemis 3 mission.

Today’s test at Stennis Space Center in Mississippi focused on the SLS rocket’s core stage and its four Aerojet Rocketdyne RS-25 engines. The engines are refurbished leftovers from the space shuttle program, and had been used on shuttle missions going as far back as 1998.

Each of the engines delivers more than 400,000 pounds of thrust, adding up to 1.6 million pounds of thrust when all four engines are firing. When the Artemis 1 mission lifts off, the SLS’ solid rocket boosters will bring total thrust to more than 8 million pounds. In comparison, the Saturn V moon rocket’s first stage delivered 7.6 million pounds of thrust back in the 1960s and 1970s.

NASA’s SLS team put months of work into the preparations for today’s test. More than 700,000 pounds of super-chilled hydrogen and oxygen were loaded into the core stage’s tanks for the engine firing. When the countdown reached zero, all four engines roared into life on cue, sending giant clouds of steam billowing into the air.

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GeekWire

Target for SLS rocket’s first launch shifts to 2021

SLS tank test
NASA engineers load a test article for the SLS liquid-oxygen tank into its test stand at Marshall Space Flight Center in Alabama. (NASA Photo)

NASA Administrator Jim Bridenstine told lawmakers today that the first launch of the heavy-lift Space Launch System was “definitely achievable by 2021,” seemingly signaling a shift in the plan for a 2020 maiden launch.

Bridenstine’s testimony to the Senate Committee on Commerce, Science and Transportation came just a day after he wrote in a blog post that NASA was “staying on schedule for flying the Artemis 1 mission with our Orion spacecraft on the Space Launch System (SLS) rocket next year, and for sending the first crewed mission, Artemis 2, to the lunar vicinity by 2022.”

Artemis 1, previously known as Exploration Mission 1 or EM-1, would launch an uncrewed Orion capsule on a test flight looping around the moon. Artemis 2 would trace a similar course with a crew on board, in preparation for sending two astronauts to the moon’s surface in 2024 via a yet-to-be-built Gateway space outpost in lunar orbit..

Today, Bridenstine said Artemis 2 was scheduled for the 2022-2023 time frame. He stuck with the 2024 date for the lunar landing.

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GeekWire

Watchdogs worry over NASA super-rocket

Space Launch System
An artist’s conception shows NASA’s Space Launch System in flight. (NASA Illustration)

The federal government’s watchdog agency says getting NASA’s heavy-lift Space Launch System rocket off the ground is likely to take longer and cost more than the space agency says it will.

Any issues that crop up in the months ahead could push the first uncrewed SLS launch, known as Artemis 1, from its planned mid-2020 timetable to mid-2021, the Government Accountability Office said in a study issued today.

What’s more, the GAO says NASA has been shifting costs forward to make it look as if expenses for the first launch have grown by $1 billion, when the actual adjusted cost growth is $1.8 billion.

Schedule and cost issues for SLS are particularly problematic because the rocket has been selected to carry NASA astronauts to the moon by 2024.

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GeekWire

NASA considers going commercial for moon flight

Orion spaceship
An artist’s conception shows NASA’s Orion deep-space crew capsule with its European Service Module placed beneath it and an upper stage powering it out of Earth orbit. (NASA Illustration)

NASA Administrator Jim Bridenstine told a Senate hearing today that his agency is looking into an option to double up commercial launch vehicles in order to keep a crucial test mission for its Orion spaceship and European-built service module on schedule for mid-2020.

The shift would take NASA’s own heavy-lift Space Launch System rocket, or SLS, out of the rotation for the uncrewed test flight around the moon, known as Exploration Mission 1 or EM-1.

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