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Old Missions, New Discoveries: NASA’s Data Archives Accelerate Science
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By NASA
6 Min Read NASA’s Chandra Shares a New View of Our Galactic Neighbor
The Andromeda galaxy, also known as Messier 31 (M31), is the closest spiral galaxy to the Milky Way at a distance of about 2.5 million light-years. Astronomers use Andromeda to understand the structure and evolution of our own spiral, which is much harder to do since Earth is embedded inside the Milky Way.
The galaxy M31 has played an important role in many aspects of astrophysics, but particularly in the discovery of dark matter. In the 1960s, astronomer Vera Rubin and her colleagues studied M31 and determined that there was some unseen matter in the galaxy that was affecting how the galaxy and its spiral arms rotated. This unknown material was named “dark matter.” Its nature remains one of the biggest open questions in astrophysics today, one which NASA’s upcoming Nancy Grace Roman Space Telescope is designed to help answer.
X-ray: NASA/CXO/UMass/Z. Li & Q.D. Wang, ESA/XMM-Newton; Infrared: NASA/JPL-Caltech/WISE, Spitzer, NASA/JPL-Caltech/K. Gordon (U. Az), ESA/Herschel, ESA/Planck, NASA/IRAS, NASA/COBE; Radio: NSF/GBT/WSRT/IRAM/C. Clark (STScI); Ultraviolet: NASA/JPL-Caltech/GALEX; Optical: Andromeda, Unexpected © Marcel Drechsler, Xavier Strottner, Yann Sainty & J. Sahner, T. Kottary. Composite image processing: L. Frattare, K. Arcand, J.Major This new composite image contains data of M31 taken by some of the world’s most powerful telescopes in different kinds of light. This image includes X-rays from NASA’s Chandra X-ray Observatory and ESA’s (European Space Agency’s) XMM-Newton (represented in red, green, and blue); ultraviolet data from NASA’s retired GALEX (blue); optical data from astrophotographers using ground based telescopes (Jakob Sahner and Tarun Kottary); infrared data from NASA’s retired Spitzer Space Telescope, the Infrared Astronomy Satellite, COBE, Planck, and Herschel (red, orange, and purple); and radio data from the Westerbork Synthesis Radio Telescope (red-orange).
The Andromeda Galaxy (M31) in Different Types of Light.X-ray: NASA/CXO/UMass/Z. Li & Q.D. Wang, ESA/XMM-Newton; Infrared: NASA/JPL-Caltech/WISE, Spitzer, NASA/JPL-Caltech/K. Gordon (U. Az), ESA/Herschel, ESA/Planck, NASA/IRAS, NASA/COBE; Radio: NSF/GBT/WSRT/IRAM/C. Clark (STScI); Ultraviolet: NASA/JPL-Caltech/GALEX; Optical: Andromeda, Unexpected © Marcel Drechsler, Xavier Strottner, Yann Sainty & J. Sahner, T. Kottary. Composite image processing: L. Frattare, K. Arcand, J.Major Each type of light reveals new information about this close galactic relative to the Milky Way. For example, Chandra’s X-rays reveal the high-energy radiation around the supermassive black hole at the center of M31 as well as many other smaller compact and dense objects strewn across the galaxy. A recent paper about Chandra observations of M31 discusses the amount of X-rays produced by the supermassive black hole in the center of the galaxy over the last 15 years. One flare was observed in 2013, which appears to represent an amplification of the typical X-rays seen from the black hole.
These multi-wavelength datasets are also being released as a sonification, which includes the same wavelengths of data in the new composite. In the sonification, the layer from each telescope has been separated out and rotated so that they stack on top of each other horizontally, beginning with X-rays at the top and then moving through ultraviolet, optical, infrared, and radio at the bottom. As the scan moves from left to right in the sonification, each type of light is mapped to a different range of notes, from lower-energy radio waves up through the high energy of X-rays. Meanwhile, the brightness of each source controls volume, and the vertical location dictates the pitch.
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In this sonification of M31, the layers from each telescope has been separated out and rotated so that they stack on top of each other horizontally beginning with X-rays at the top and then moving through ultraviolet, optical, infrared, and radio at the bottom. As the scan moves from left to right in the sonification, each type of light is mapped to a different range of notes ranging from lower-energy radio waves up through the high-energy of X-rays. Meanwhile, the brightness of each source controls volume and the vertical location dictates the pitch.NASA/CXC/SAO/K.Arcand, SYSTEM Sounds (M. Russo, A. Santaguida This new image of M31 is released in tribute to the groundbreaking legacy of Dr. Vera Rubin, whose observations transformed our understanding of the universe. Rubin’s meticulous measurements of Andromeda’s rotation curve provided some of the earliest and most convincing evidence that galaxies are embedded in massive halos of invisible material — what we now call dark matter. Her work challenged long-held assumptions and catalyzed a new era of research into the composition and dynamics of the cosmos. In recognition of her profound scientific contributions, the United States Mint has recently released a quarter in 2025 featuring Rubin as part of its American Women Quarters Program — making her the first astronomer honored in the series.
NASA’s Marshall Space Flight Center in Huntsville, Alabama, manages the Chandra program. The Smithsonian Astrophysical Observatory’s Chandra X-ray Center controls science operations from Cambridge, Massachusetts, and flight operations from Burlington, Massachusetts.
Read more from NASA’s Chandra X-ray Observatory Learn more about the Chandra X-ray Observatory and its mission here:
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Visual Description
This release features several images and a sonification video examining the Andromeda galaxy, our closest spiral galaxy neighbor. This collection helps astronomers understand the evolution of the Milky Way, our own spiral galaxy, and provides a fascinating insight into astronomical data gathering and presentation.
Like all spiral galaxies viewed at this distance and angle, Andromeda appears relatively flat. Its spiraling arms circle around a bright core, creating a disk shape, like a large dinner plate. In most of the images in this collection, Andromeda’s flat surface is tilted to face our upper left.
This collection features data from some of the world’s most powerful telescopes, each capturing light in a different spectrum. In each single-spectrum image, Andromeda has a similar shape and orientation, but the colors and details are dramatically different.
In radio waves, the spiraling arms appear red and orange, like a burning, loosely coiled rope. The center appears black, with no core discernible. In infrared light, the outer arms are similarly fiery. Here, a white spiraling ring encircles a blue center with a small golden core. The optical image is hazy and grey, with spiraling arms like faded smoke rings. Here, the blackness of space is dotted with specks of light, and a small bright dot glows at the core of the galaxy. In ultraviolet light the spiraling arms are icy blue and white, with a hazy white ball at the core. No spiral arms are present in the X-ray image, making the bright golden core and nearby stars clear and easy to study.
In this release, the single-spectrum images are presented side by side for easy comparison. They are also combined into a composite image. In the composite, Andromeda’s spiraling arms are the color of red wine near the outer edges, and lavender near the center. The core is large and bright, surrounded by a cluster of bright blue and green specks. Other small flecks in a variety of colors dot the galaxy, and the blackness of space surrounding it.
This release also features a thirty second video, which sonifies the collected data. In the video, the single-spectrum images are stacked vertically, one atop the other. As the video plays, an activation line sweeps across the stacked images from left to right. Musical notes ring out when the line encounters light. The lower the wavelength energy, the lower the pitches of the notes. The brighter the source, the louder the volume.
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Lane Figueroa
Marshall Space Flight Center, Huntsville, Alabama
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lane.e.figueroa@nasa.gov
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Last Updated Jun 25, 2025 EditorLee MohonContactLane Figueroa Related Terms
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By NASA
6 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
With Voyager 2 in the background, John Casani holds a small U.S. flag that was sewn into the spacecraft’s thermal blankets before its 1977 launch. Then Voyager’s project manager, Casani was first to envision the mission’s Golden Record, which lies before him with its cover at right. NASA/JPL-Caltech During his work on several historic missions, Casani rose through a series of technical and management positions, making an indelible mark on the nation’s space program.
John R. Casani, a visionary engineer who served a central role in many of NASA’s historic deep space missions, died on Thursday, June 19, 2025, at the age of 92. He was preceded in death by his wife of 39 years, Lynn Casani, in 2008 and is survived by five sons and their families.
Casani started at the Jet Propulsion Laboratory in Southern California in 1956 and went on to work as an electronics engineer on some of the nation’s earliest spacecraft after NASA’s formation in 1958. Along with leading the design teams for both the Ranger and Mariner series of spacecraft, he held senior project positions on many of the Mariner missions to Mars and Venus, and was project manager for three trailblazing space missions: Voyager, Galileo, and Cassini.
His work helped advance NASA spacecraft in areas including mechanical technology, system design and integration, software, and deep space communications. No less demanding were the management challenges of these multifaceted missions, which led to innovations still in use today.
JPL’s John Casani receives the National Air & Space Museum’s Lifetime Achievement Award.Carolyn Russo/NASM, National Air and Space Museum, Smithsonian Institution “John had a major influence on the development of spacecraft that visited almost every planet in our solar system, as well as the people who helped build them,” said JPL director Dave Gallagher. “He played an essential role in America’s first attempts to reach space and then the Moon, and he was just as crucial to the Voyager spacecraft that marked humanity’s first foray into interplanetary — and later, interstellar — space. That Voyager is still exploring after nearly 50 years is a testament to John’s remarkable engineering talent and his leadership that enabled others to push the boundaries of possibility.”
Born in Philadelphia in 1932, Casani studied electrical engineering at the University of Pennsylvania. After a short stint at an Air Force research lab, he moved to California in 1956 and was hired to work at JPL, a division of Caltech, on the guidance system for the U.S. Army Ballistic Missile Agency’s Jupiter-C and Sergeant missile programs.
In 1957, the Soviet Union launched Sputnik 1, the first human-made Earth satellite, alarming America and changing the trajectory of both JPL and Casani’s career. With the 1958 launch of Explorer 1, America’s first satellite, the lab transitioned to concentrating on robotic space explorers, and Casani segued from missiles to spacecraft.
One of his jobs as payload engineer on Pioneer 3 and 4, NASA’s first missions to the Moon, was to carry each of the 20-inch-long (51-cm-long) probes in a suitcase from JPL to the launch site at Cape Canaveral, Florida, where he installed them in the rocket’s nose cone.
At the dawn of the 1960s, Casani served as spacecraft systems engineer for the agency’s first two Ranger missions to the Moon, then joined the Mariner project in 1965, earning a reputation for being meticulous. Four years later, he was Mariner project manager.
Asked to share some of his wisdom in a 2009 NASA presentation, Casani said, “The thing that makes any of this work … is toughness. Toughness because this is a tough business, and it’s a very unforgiving business. You can do 1,000 things right, but if you don’t do everything right, it’ll come back and bite you.”
Casani’s next role: project manager for NASA’s high-profile flagship mission to the outer planets and beyond — Voyager. He not only led the mission from clean room to space, he was first to envision attaching a message representing humanity to any alien civilization that might encounter humanity’s first interstellar emissaries.
“I approached Carl Sagan,” he said in a 2007 radio interview, “and asked him if he could come up with something that would be appropriate that we could put on our spacecraft in a way of sending a message to whoever might receive it.” Sagan took up the challenge, and what resulted was the Golden Record, a 12-inch gold-plated copper disk containing sounds and images selected to portray the diversity of life and culture on Earth.
Once Voyager 1 and 2 and their Golden Records launched in 1977, JPL wasted no time in pointing their “engineer’s engineer” toward Galileo, which would become the first mission to orbit a gas giant planet. As the mission’s initial project manager, Casani led the effort from inception to assembly. Along the way, he had to navigate several congressional attempts to end the project, necessitating multiple visits to Washington. The 1986 loss of Space Shuttle Challenger, from which Galileo was to launch atop a Centaur upper-stage booster, led to mission redesign efforts before its 1989 launch.
After 11 years leading Galileo, Casani became deputy assistant laboratory director for flight projects in 1988, received a promotion just over a year later and then, from 1990 to 1991, served as project manager of Cassini, NASA’s first flagship mission to orbit Saturn.
Casani became JPL’s first chief engineer in 1994, retiring in 1999 and serving on several nationally prominent committees, including leading the investigation boards of both the Mars Climate Orbiter and the Mars Polar Lander failures, and also leading the James Webb Space Telescope Independent Comprehensive Review Panel.
In early 2003, Casani returned to JPL to serve as project manager for NASA’s Project Prometheus, which would have been the nation’s first nuclear-powered, electric-propulsion spacecraft. In 2005, he became manager of the Institutional Special Projects Office at JPL, a position he held until retiring again in 2012.
“Throughout his career, John reflected the true spirit of JPL: bold, innovative, visionary, and welcoming,” said Charles Elachi, JPL’s director from 2001 to 2016. “He was an undisputed leader with an upbeat, fun attitude and left an indelible mark on the laboratory and NASA. I am proud to have called him a friend.”
Casani received many awards over his lifetime, including NASA’s Exceptional Achievement Medal, the Management Improvement Award from the President of the United States for the Mariner Venus Mercury mission, and the Air and Space Museum Trophy for Lifetime Achievement.
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Matthew Segal / Veronica McGregor
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Last Updated Jun 25, 2025 Related Terms
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6 min read NASA’s Perseverance Rover Scours Mars for Science
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By NASA
6 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
In addition to drilling rock core samples, the science team has been grinding its way into rocks to make sense of the scientific evidence hiding just below the surface.
NASA’s Perseverance rover uses an abrading bit to get below the surface of a rocky out-crop nicknamed “Kenmore” on June 10. The eight images that make up this video were taken approximately one minute apart by one of the rover’s front hazard-avoidance cameras. NASA/JPL-Caltech On June 3, NASA’s Perseverance Mars rover ground down a portion of a rock surface, blew away the resulting debris, and then went to work studying its pristine interior with a suite of instruments designed to determine its mineralogic makeup and geologic origin. “Kenmore,” as nicknamed by the rover science team, is the 30th Martian rock that Perseverance has subjected to such in-depth scrutiny, beginning with drilling a two-inch-wide (5-centimeter-wide) abrasion patch.
“Kenmore was a weird, uncooperative rock,” said Perseverance’s deputy project scientist, Ken Farley from Caltech in Pasadena, California. “Visually, it looked fine — the sort of rock we could get a good abrasion on and perhaps, if the science was right, perform a sample collection. But during abrasion, it vibrated all over the place and small chunks broke off. Fortunately, we managed to get just far enough below the surface to move forward with an analysis.”
The science team wants to get below the weathered, dusty surface of Mars rocks to see important details about a rock’s composition and history. Grinding away an abrasion patch also creates a flat surface that enables Perseverance’s science instruments to get up close and personal with the rock.
This close-up view of an abrasion showing distinctive “tool marks” created by the Perseverance’s abrading bit was acquired on June 5. The image was taken from approximately 2.76 inches (7 centimeters) away by the rover’s WATSON imager. NASA/JPL-Caltech/MSSS Perseverance’s gold-colored abrading bit takes center stage in this image of the rover’s drill taken by the Mastcam-Z instrument on Aug. 2, 2021, the 160th day of the mission to Mars.NASA/JPL-Caltech/ASU/MSSS Time to Grind
NASA’s Mars Exploration Rovers, Spirit and Opportunity, each carried a diamond-dust-tipped grinder called the Rock Abrasion Tool (RAT) that spun at 3,000 revolutions per minute as the rover’s robotic arm pushed it deeper into the rock. Two wire brushes then swept the resulting debris, or tailings, out of the way. The agency’s Curiosity rover carries a Dust Removal Tool, whose wire bristles sweep dust from the rock’s surface before the rover drills into the rock. Perseverance, meanwhile, relies on a purpose-built abrading bit, and it clears the tailings with a device that surpasses wire brushes: the gaseous Dust Removal Tool, or gDRT.
“We use Perseverance’s gDRT to fire a 12-pounds-per-square-inch (about 83 kilopascals) puff of nitrogen at the tailings and dust that cover a freshly abraded rock,” said Kyle Kaplan, a robotic engineer at NASA’s Jet Propulsion Laboratory in Southern California. “Five puffs per abrasion — one to vent the tanks and four to clear the abrasion. And gDRT has a long way to go. Since landing at Jezero Crater over four years ago, we’ve puffed 169 times. There are roughly 800 puffs remaining in the tank.” The gDRT offers a key advantage over a brushing approach: It avoids any terrestrial contaminants that might be on a brush from getting on the Martian rock being studied.
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This video captures a test of Perseverance’s Gaseous Dust Removal Tool (gDRT) in a vacuum chamber at NASA’s Jet Propulsion Laboratory in August 2020. The tool fires puffs of nitrogen gas at the tailings and dust that cover a rock after it has been abraded by the rover.NASA/JPL-Caltech Having collected data on abraded surfaces more than 30 times, the rover team has in-situ science (studying something in its original place or position) collection pretty much down. After gDRT blows the tailings away, the rover’s WATSON (Wide Angle Topographic Sensor for Operations and eNgineering) imager (which, like gDRT, is at the end of the rover’s arm) swoops in for close-up photos. Then, from its vantage point high on the rover’s mast, SuperCam fires thousands of individual pulses from its laser, each time using a spectrometer to determine the makeup of the plume of microscopic material liberated after every zap. SuperCam also employs a different spectrometer to analyze the visible and infrared light that bounces off the materials in the abraded area.
“SuperCam made observations in the abrasion patch and of the powdered tailings next to the patch,” said SuperCam team member and “Crater Rim” campaign science lead, Cathy Quantin-Nataf of the University of Lyon in France. “The tailings showed us that this rock contains clay minerals, which contain water as hydroxide molecules bound with iron and magnesium — relatively typical of ancient Mars clay minerals. The abrasion spectra gave us the chemical composition of the rock, showing enhancements in iron and magnesium.”
Later, the SHERLOC (Scanning Habitable Environments with Raman & Luminescence for Organics & Chemicals) and PIXL (Planetary Instrument for X-ray Lithochemistry) instruments took a crack at Kenmore, too. Along with supporting SuperCam’s discoveries that the rock contained clay, they detected feldspar (the mineral that makes much of the Moon brilliantly bright in sunlight). The PIXL instrument also detected a manganese hydroxide mineral in the abrasion — the first time this type of material has been identified during the mission.
With Kenmore data collection complete, the rover headed off to new territories to explore rocks — both cooperative and uncooperative — along the rim of Jezero Crater.
“One thing you learn early working on Mars rover missions is that not all Mars rocks are created equal,” said Farley. “The data we obtain now from rocks like Kenmore will help future missions so they don’t have to think about weird, uncooperative rocks. Instead, they’ll have a much better idea whether you can easily drive over it, sample it, separate the hydrogen and oxygen contained inside for fuel, or if it would be suitable to use as construction material for a habitat.”
Long-Haul Roving
On June 19 (the 1,540th Martian day, or sol, of the mission), Perseverance bested its previous record for distance traveled in a single autonomous drive, trekking 1,348 feet (411 meters). That’s about 210 feet (64 meters) more than its previous record, set on April 3, 2023 (Sol 753). While planners map out the rover’s general routes, Perseverance can cut down driving time between areas of scientific interest by using its self-driving system, AutoNav.
“Perseverance drove 4½ football fields and could have gone even farther, but that was where the science team wanted us to stop,” said Camden Miller, a rover driver for Perseverance at JPL. “And we absolutely nailed our stop target location. Every day operating on Mars, we learn more on how to get the most out of our rover. And what we learn today future Mars missions won’t have to learn tomorrow.”
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NASA Headquarters, Washington
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Last Updated Jun 25, 2025 Related Terms
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By NASA
NASA tested RS-25 engine No. 20001 on June 20, at the Fred Haise Test Stand at NASA’s Stennis Space Center at Bay St. Louis, Mississippi. Test teams fired the engine for almost eight-and-a-half minutes (500 seconds), the same amount of time RS-25 engines fire during a launch of an SLS (Space Launch System) rocket on Artemis missions to the Moon. NASA NASA tested RS-25 engine No. 20001 on June 20, at the Fred Haise Test Stand at NASA’s Stennis Space Center at Bay St. Louis, Mississippi. Test teams fired the engine for almost eight-and-a-half minutes (500 seconds), the same amount of time RS-25 engines fire during a launch of an SLS (Space Launch System) rocket on Artemis missions to the Moon. The Artemis campaign will explore the Moon for scientific discovery, economic benefits, and to build the foundation for the first crewed missions to Mars – for the benefit of all.
Four RS-25 engines, built by contractor L3Harris Technologies (formerly Aerojet Rocketdyne), help power each SLS launch, producing up to 2 million pounds of combined thrust. During the test, operators also fired engine No. 20001 up to the 111% power level, the same amount of thrust needed to launch an SLS rocket, carrying the Orion spacecraft, to orbit. The full-duration “hot fire” was the first test since NASA completed certification testing for new production RS-25 engines in 2024.
All RS-25 engines are tested and proven flightworthy at NASA Stennis. The test was conducted by a team of operators from NASA, L3Harris, and Syncom Space Services, prime contractor for site facilities and operations.
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By NASA
NASA astronauts (left to right) Anne McClain and Nichole Ayers pose for a portrait together aboard the International Space Station. Moments earlier, Ayers finished trimming McClain’s hair using an electric razor with a suction hose attached that collects the loose hair to protect the station’s atmosphere.NASA Students from New York and Utah will hear from NASA astronauts aboard the International Space Station as they answer prerecorded questions in two separate events.
At 11:30 a.m. EDT on Monday, June 23, NASA astronauts Nichole Ayers and Anne McClain will answer questions submitted by students from P.S. 71 Forest Elementary School in Ridgewood, New York. Media interested in covering the event must RSVP by 5 p.m. Friday, June 20, to Regina Beshay at: rbeshay2@school.nyc.gov or 347-740-6165.
At 11:05 a.m. on Friday, June 27, Ayers and McClain will answer questions submitted by students from Douglas Space and Science Foundation, Inc., in Layton, Utah. Media interested in covering the event must RSVP by 5 p.m. Wednesday, June 25, to Sarah Merrill at: sarahmonique@gmail.com or 805-743-3341.
Watch the 20-minute Earth-to-space calls on NASA STEM YouTube Channel.
P.S. 71 Forest Elementary School will host kindergarten through fifth grade students. Douglas Space and Science Foundation will host participants from the Science, Technology, Achievement Research camp. Both events aim to inspire students to imagine a future in science, technology, engineering, and mathematics careers through ongoing collaborations, mentorship, and hands-on learning experiences.
For nearly 25 years, astronauts have continuously lived and worked aboard the space station, testing technologies, performing science, and developing skills needed to explore farther from Earth. Astronauts aboard the orbiting laboratory communicate with NASA’s Mission Control Center in Houston 24 hours a day through SCaN’s (Space Communications and Navigation) Near Space Network.
Important research and technology investigations taking place aboard the space station benefit people on Earth and lays the groundwork for other agency missions. As part of NASA’s Artemis campaign, the agency will send astronauts to the Moon to prepare for future human exploration of Mars; inspiring explorers and ensuring the United States continues to lead in space exploration and discovery.
See videos of astronauts aboard the space station at:
https://www.nasa.gov/stemonstation
-end-
Gerelle Dodson
Headquarters, Washington
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Johnson Space Center, Houston
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