NASA Conducts 2nd RS-25 Test in Latest Series for Artemis Moon Missions

RS-25 engine test. (Credit; NASA)

BAY ST. LOUIS, Miss. (NASA PR) — NASA conducted a second RS-25 single engine hot fire test April 6 as part of a new series to support the development and production of engines for the agency’s Space Launch System (SLS) rocket on future missions to the Moon.

The full-duration hot fire of more than eight minutes (500 seconds) was conducted on the A-1 Test Stand at NASA’s Stennis Space Center near Bay St. Louis. It is part of a scheduled seven-test series designed to provide valuable data for Aerojet Rocketdyne, lead contractor for the SLS engines, as it begins production of new RS-25 engines for use after the first four SLS flights.

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Boeing Statement on SLS Core Hot Fire

Acting NASA Administrator Steve Jurczyk, left, and Rick Gilbrech, director of NASA’s Stennis Space Center, right, watch as the core stage for the first flight of NASA’s Space Launch System rocket undergoes a second hot fire test in the B-2 Test Stand, Thursday, March 18, 2021, at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. The four RS-25 engines fired for the full-duration of 8 minutes during the test and generated 1.6 million pounds of thrust. The hot fire test is the final stage of the Green Run test series, a comprehensive assessment of the Space Launch System’s core stage prior to launching the Artemis I mission to the Moon. (Credit: NASA/Robert Markowitz)

STENNIS SPACE CENTER, Mississippi, March 18, 2021 (Boeing PR) — Deep space exploration took an important step forward today. The cryogenic core stage for NASA’s Space Launch System (SLS) rocket completed hot fire testing at NASA’s Stennis Space Center as part of the SLS rocket’s Green Run test campaign on the B-2 test stand. The test, which included a full-duration, eight-minute engine burn, demonstrated successful core stage operation and will be used to help certify the stage for flight.

“I want to thank the extraordinary individuals who make up the NASA, Aerojet Rocketdyne and Boeing teams who designed, developed, produced and tested the all-new SLS core stage to enable sustainable human exploration of deep space,” said John Shannon, Boeing SLS vice president and program manager.

NASA Mega Moon Rocket Passes Key Test, Readies for Launch

The core stage for the first flight of NASA’s Space Launch System rocket is seen in the B-2 Test Stand during a second hot fire test, Thursday, March 18, 2021, at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. The four RS-25 engines fired for the full-duration of 8 minutes during the test and generated 1.6 million pounds of thrust. The hot fire test is the final stage of the Green Run test series, a comprehensive assessment of the Space Launch System’s core stage prior to launching the Artemis I mission to the Moon. (Credits: NASA/Robert Markowitz)

BAY ST. LOUIS, Miss. (NASA PR) — The largest rocket element NASA has ever built, the core stage of NASA’s Space Launch System (SLS) rocket, fired its four RS-25 engines for 8 minutes and 19 seconds Thursday at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. The successful test, known as a hot fire, is a critical milestone ahead of the agency’s Artemis I mission, which will send an uncrewed Orion spacecraft on a test flight around the Moon and back to Earth, paving the way for future Artemis missions with astronauts.

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NASA Completes Full Duration Hot Fire of Space Launch System Core

BAY ST. LOUIS, Miss. (NASA PR) — Teams from NASA’s Space Launch System (SLS) Program conducted a successful full-duration 8 minute (499.6 seconds) hot fire of the Artemis I core stage on Thursday, Mar. 18 at NASA’s Stennis Space Center near Bay St. Louis, Mississippi on the historic B-2 Test Stand.

The hot fire got underway at around 4:40 p.m. EDT with all four RS-25 engines ignited successfully and produced 1.6 million pounds of thrust, as they will to launch the Artemis I mission to the Moon. During the test the engines consumed more than 700,000 gallons of liquid oxygen and liquid hydrogen propellant. The test was conducted with the core stage that will launch that first Artemis mission. Engineers collect data on how the stage behaved during critical operations, such as throttling the engines up and down and moving the engines dynamically in a variety of patterns. In coming days, engineers will scrutinize the data and determine if the stage is ready to be delivered to NASA’s Kennedy Space Center in Florida where it will be integrated with the twin solid rocket boosters already stacked in the Vehicle Assembly Building.

To learn more, tune in to NASA TV for a post-test briefing at about 7 p.m. EDT.

Learn more about Green Run, and check back at this blog for updates on the SLS core stage hot fire test. Watch a replay of the test on NASA Television or NASA’s YouTube channel. For all the photos and videos related to the test, visit, the Green Run Album on NASA Images.org.

NASA Green Run Hot Fire Set for Later Today

The core stage for the first flight of NASA’s Space Launch System rocket is seen in the B-2 Test Stand during a scheduled eight minute duration hot fire test, Saturday, Jan. 16, 2021, at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. The four RS-25 engines fired for a little more than one minute. The hot fire test is the final stage of the Green Run test series, a comprehensive assessment of the Space Launch System’s core stage prior to launching the Artemis I mission to the Moon. (Credit: NASA/Robert Markowitz)

BAY ST. LOUIS, Miss. (NASA PR) — NASA is targeting a two-hour test window that opens at 3 p.m. EDT Thursday, March 18, for the second hot fire test of the core stage for the agency’s Space Launch System (SLS) rocket at NASA’s Stennis Space Center near Bay St. Louis, Mississippi.

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Reports Say Biden Will Nominate Former Florida Senator Bill Nelson to Lead NASA

Florida Senator Bill Nelson

There are reports this morning that former Florida Senator Bill Nelson to be the next administrator of NASA. I don’t see anything official on the White House website, but it seems likely.

The same reports say that former NASA astronaut Pam Melroy will be nominated to serve as deputy administrator. The retired U.S. Air Force colonel served as pilot for two space shuttle missions before commanding the STS-120 mission in 2007. She was a member of the Biden Admimistration’s agency review team for NASA during the transition.

Nelson, 79, served three terms in the U.S. Senate from 2001-2019, where he was a strong backer of NASA and the U.S. space program. He served in the U.S. House of Representatives from 1979-2001. Nelson is considered to be a moderate Democrat.

Rumors of Nelson’s nomination to NASA’s top job have caused considerable consternation among NewSpace supporters. They blame him for helping saddle NASA with the perpetually over budget and behind schedule Space Launch System (SLS) that has been the biggest barrier to sending astronauts back to the moon.

The core stage of SLS is due for a hot fire at the NASA Stennis Space Center in Mississippi. An announcement of Nelson’s appointment today would be interesting if it actually happens.

One action that some hold against Nelson is his flight aboard the space shuttle Columbia while serving in the House. Nelson flew as a payload specialist on the STS-61-C in January 1986. This was the flight immediately prior to the loss of the space shuttle Challenger later that month.

Nelson is one of only two sitting members of Congress to fly into space. Utah Sen. Jake Garn, a Republican, flew as a payload specialist aboard the space shuttle Discovery in April 1985.

NASA TV to Air Second Rocket Test for Artemis Moon Missions

The core stage for the first flight of NASA’s Space Launch System rocket is seen in the B-2 Test Stand during a scheduled eight minute duration hot fire test, Saturday, Jan. 16, 2021, at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. The four RS-25 engines fired for a little more than one minute. The hot fire test is the final stage of the Green Run test series, a comprehensive assessment of the Space Launch System’s core stage prior to launching the Artemis I mission to the Moon. (Credit: NASA/Robert Markowitz)

BAY ST. LOUIS, Miss. (NASA PR) — NASA is targeting a two-hour test window that opens at 3 p.m. EDT Thursday, March 18, for the second hot fire test of the core stage for the agency’s Space Launch System (SLS) rocket at NASA’s Stennis Space Center near Bay St. Louis, Mississippi.

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Green Run Update: NASA Targets March 18 for SLS Hot Fire Test

The core stage for the first flight of NASA’s Space Launch System rocket is seen in the B-2 Test Stand during a scheduled eight minute duration hot fire test, Saturday, Jan. 16, 2021, at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. (Credit: NASA/Robert Markowitz)

BAY ST. LOUIS, Miss. (NASA PR) — NASA is targeting Thursday, March 18 for the second hot fire of the Space Launch System (SLS) rocket’s core stage at NASA’s Stennis Space Center near Bay St. Louis, Mississippi.

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Green Run Update: NASA Investigating Valve Performance Before Second Hot Fire

The core stage for the first flight of NASA’s Space Launch System rocket is seen in the B-2 Test Stand during a scheduled eight minute duration hot fire test, Saturday, Jan. 16, 2021, at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. The four RS-25 engines fired for a little more than one minute. The hot fire test is the final stage of the Green Run test series, a comprehensive assessment of the Space Launch System’s core stage prior to launching the Artemis I mission to the Moon. (Credit: NASA/Robert Markowitz)

BAY ST. LOUIS, Miss. (NASA PR) — NASA’s is reviewing the performance of a valve on the core stage of the Space Launch System rocket before proceeding with a second hot fire test at the agency’s Stennis Space Center near Bay St. Louis, Mississippi.

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Green Run Update: SLS Team Prepares Core Stage for Second Hot Fire Test

The core stage for the first flight of NASA’s Space Launch System rocket is seen in the B-2 Test Stand during a scheduled eight minute duration hot fire test, Saturday, Jan. 16, 2021, at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. The four RS-25 engines fired for a little more than one minute. The hot fire test is the final stage of the Green Run test series, a comprehensive assessment of the Space Launch System’s core stage prior to launching the Artemis I mission to the Moon. (Credit: NASA/Robert Markowitz)

BAY ST. LOUIS, Miss., February 12, 2021 (NASA PR) — The core stage Green Run test team has completed refurbishment activities and is preparing the Space Launch System (SLS) rocket’s core stage and its four RS-25 engines for a second hot fire test.

After the first SLS core stage hot fire test on Jan. 16 at NASA’s Stennis Space Center near Bay St. Louis, Mississippi, the team put the stand and core stage in a configuration so that the stage and stand could be refurbished. This involved installing platforms on the test stand so that technicians could inspect, access, and perform procedures on the hardware.

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RS-25 Engine Test Series to Demonstration Lower-cost Rocket Engine Components for NASA’s Artemis Program

RS-25 hot fire test (Credits: NASA/Stennis Space Center)

STENNIS SPACE CENTER, Miss., Jan. 27, 2021 (Aerojet Rocketdyne PR) — Aerojet Rocketdyne and NASA are gearing up for a new phase of RS-25 hot-fire testing that will validate new components for the engine, which powers the core stage of the agency’s Space Launch System super heavy-lift exploration rocket.

The Retrofit-2 test series, consisting of seven tests at NASA’s Stennis Space Center, is expected to begin Jan. 28 and run through June. Each hot-fire test will last up to 500 seconds on the A1 Test Stand.

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NASA Conducts 1st Hot Fire of New RS-25 Engine Test Series

RS-25 hot fire test (Credits: NASA/Stennis Space Center)

BAY ST. LOUIS, Miss. (NASA PR) — NASA conducts the first hot fire Jan. 28 in a new series of tests for production of RS-25 engines that will help power the agency’s Space Launch System (SLS) rocket on future deep space missions. The test of RS-25 developmental engine No. 0528 on the A-1 Test Stand at Stennis Space Center near Bay St. Louis, Miss., marks the beginning of a seven-test series designed to provide valuable data to Aerojet Rocketdyne, lead contractor for SLS engines, as the company begins production of new RS-25 engines.

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Green Run Update: NASA Proceeds With Plans for Second SLS Core Stage Hot Fire Test

The core stage for the first flight of NASA’s Space Launch System rocket is seen in the B-2 Test Stand during a scheduled eight minute duration hot fire test, Saturday, Jan. 16, 2021, at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. The four RS-25 engines fired for a little more than one minute. The hot fire test is the final stage of the Green Run test series, a comprehensive assessment of the Space Launch System’s core stage prior to launching the Artemis I mission to the Moon. (Credit: NASA/Robert Markowitz)

HUNTSVILLE, Ala. (NASA PR) — NASA plans to conduct a second Green Run hot fire test as early as the fourth week in February with the Space Launch System (SLS) rocket’s core stage that will launch the Artemis I mission to the Moon. The Green Run is a comprehensive assessment of the rocket’s core stage prior to launching Artemis missions.

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Green Run Update: Hot Fire Met Many Objectives, Test Assessment Underway

The core stage for the first flight of NASA’s Space Launch System rocket is seen in the B-2 Test Stand during a scheduled eight minute duration hot fire test, Saturday, Jan. 16, 2021, at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. The four RS-25 engines fired for a little more than one minute. The hot fire test is the final stage of the Green Run test series, a comprehensive assessment of the Space Launch System’s core stage prior to launching the Artemis I mission to the Moon. (Credit: NASA/Robert Markowitz)

BAY ST. LOUIS, Miss. (NASA PR) — For the Green Run hot fire test on Jan. 16, NASA set out to acquire test data to support 23 detailed verification objectives. To satisfy the objectives, hot fire test data is used in combination with analysis and testing that has already been completed. These detailed verification objectives are used to certify the design of the Space Launch System rocket’s core stage.

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Rocket Roundup: NASA Doesn’t Get What It Wanted or Needed

The core stage for the first flight of NASA’s Space Launch System rocket is seen in the B-2 Test Stand during a scheduled eight minute duration hot fire test, Saturday, Jan. 16, 2021, at NASA’s Stennis Space Center near Bay St. Louis, Mississippi. The four RS-25 engines fired for a little more than one minute. The hot fire test is the final stage of the Green Run test series, a comprehensive assessment of the Space Launch System’s core stage prior to launching the Artemis I mission to the Moon. (Credit: NASA/Robert Markowitz)

by Douglas Messier
Managing Editor

There’s an old saying that I made up just the other day. You can’t always get what you want, but if you test enough times, you get what you need.

Yes, I know. It’s unwieldy. And I expect a copyright infringement letter from the Rolling Stones’ shortly. Forgive me; it’s really hard to come up with a brand new saying that sounds old on short notice.

While we wait for the lawyers to weigh in, let’s talk about what happened over the weekend.

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