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By NASA
X-ray: NASA/CXC/Queen’s Univ. Belfast/M. Nicholl et al.; Optical/IR: PanSTARRS, NSF/Legacy Survey/SDSS; Illustration: Soheb Mandhai / The Astro Phoenix; Image Processing: NASA/CXC/SAO/N. Wolk NASA’s Chandra X-ray Observatory and other telescopes have identified a supermassive black hole that has torn apart one star and is now using that stellar wreckage to pummel another star or smaller black hole, as described in our latest press release. This research helps connect two cosmic mysteries and provides information about the environment around some of the bigger types of black holes.
This artist’s illustration shows a disk of material (red, orange, and yellow) that was created after a supermassive black hole (depicted on the right) tore apart a star through intense tidal forces. Over the course of a few years, this disk expanded outward until it intersected with another object — either a star or a small black hole — that is also in orbit around the giant black hole. Each time this object crashes into the disk, it sends out a burst of X-rays detected by Chandra. The inset shows Chandra data (purple) and an optical image of the source from Pan-STARRS (red, green, and blue).
In 2019, an optical telescope in California noticed a burst of light that astronomers later categorized as a “tidal disruption event”, or TDE. These are cases where black holes tear stars apart if they get too close through their powerful tidal forces. Astronomers gave this TDE the name of AT2019qiz.
Meanwhile, scientists were also tracking instances of another type of cosmic phenomena occasionally observed across the Universe. These were brief and regular bursts of X-rays that were near supermassive black holes. Astronomers named these events “quasi-periodic eruptions,” or QPEs.
This latest study gives scientists evidence that TDEs and QPEs are likely connected. The researchers think that QPEs arise when an object smashes into the disk left behind after the TDE. While there may be other explanations, the authors of the study propose this is the source of at least some QPEs.
In 2023, astronomers used both Chandra and Hubble to simultaneously study the debris left behind after the tidal disruption had ended. The Chandra data were obtained during three different observations, each separated by about 4 to 5 hours. The total exposure of about 14 hours of Chandra time revealed only a weak signal in the first and last chunk, but a very strong signal in the middle observation.
From there, the researchers used NASA’s Neutron Star Interior Composition Explorer (NICER) to look frequently at AT2019qiz for repeated X-ray bursts. The NICER data showed that AT2019qiz erupts roughly every 48 hours. Observations from NASA’s Neil Gehrels Swift Observatory and India’s AstroSat telescope cemented the finding.
The ultraviolet data from Hubble, obtained at the same time as the Chandra observations, allowed the scientists to determine the size of the disk around the supermassive black hole. They found that the disk had become large enough that if any object was orbiting the black hole and took about a week or less to complete an orbit, it would collide with the disk and cause eruptions.
This result has implications for searching for more quasi-periodic eruptions associated with tidal disruptions. Finding more of these would allow astronomers to measure the prevalence and distances of objects in close orbits around supermassive black holes. Some of these may be excellent targets for the planned future gravitational wave observatories.
The paper describing these results appears in the October 9, 2024 issue of the journal Nature. The first author of the paper is Matt Nicholl (Queen’s University Belfast in Ireland) and the full list of authors can be found in the paper, which is available online at: https://arxiv.org/abs/2409.02181
NASA’s Marshall Space Flight Center 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:
https://www.nasa.gov/chandra
https://chandra.si.edu
Visual Description
This release features an artist’s rendering that illustrates the destructive power of a supermassive black hole. The digital image depicts a disk of stellar material surrounding one such black hole. At its outer edge a neighboring star is colliding with and flying through the disk.
The black hole sits halfway down our right edge of the vertical image. It resembles a jet black semicircle with a domed cap of pale blue light. The bottom half of the circular black hole is hidden behind the disk of stellar material. In this illustration, the disk is viewed edge on. It resembles a band of swirling yellow, orange, and red gas, cutting diagonally from our middle right toward our lower left.
Near our lower left, the outer edge of the stellar debris disk overlaps with a bright blue sphere surrounded by luminous white swirls. This sphere represents a neighboring star crashing through the disk. The stellar disk is the wreckage of a destroyed star. An electric blue and white wave shows the hottest gas in the disk.
As the neighboring star crashes through the disk it leaves behind a trail of gas depicted as streaks of fine mist. Bursts of X-rays are released and are detected by Chandra.
Superimposed in the upper left corner of the illustration is an inset box showing a close up image of the source in X-ray and optical light. X-ray light is shown as purple and optical light is white and beige.
News Media Contact
Megan Watzke
Chandra X-ray Center
Cambridge, Mass.
617-496-7998
Lane Figueroa
Marshall Space Flight Center, Huntsville, Alabama
256-544-0034
lane.e.figueroa@nasa.gov
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By NASA
4 Min Read Unique NASA Partnerships Spark STEM Learning on Global Scale
NASA astronaut Thomas Marshburn reading “Goodnight Moon” aboard station for Crayola’s “Read Along, Draw Along” Credits: NASA NASA offers a world of experiences and opportunities to engage young explorers around the globe in the excitement of science, technology, engineering, and mathematics (STEM). NASA’s Office of STEM Engagement collaborates with experts throughout the agency, the U.S. government, and a variety of global partners to spark inspiration in Artemis Generation students everywhere.
Partnerships with the agency reach new audiences. Here are some of the ways NASA and its partners are making exciting STEM learning resources and opportunities available globally.
NASA and Minecraft collaborated to bring NASA missions to life. NASA and Crayola partnered on a series of virtual engagements to encourage students and families to participate in science, technology, engineering, art, and mathematics (STEAM) content – for example, the annual Crayola Creativity Week. NASA partnered with LEGO Education on educational resources to introduce STEAM concepts and careers with students, teachers, and families. NASA joined forces with Discovery Education to provide curriculum support resources, videos, and events through their online platform. NASA recently signed an agreement with Arizona State University’s Milo Space Science Institute to create new opportunities for students to engage in STEM workforce development through 12-week academies using NASA data sets, information from NASA subject matter experts as well as information on the agency’s missions and careers. NASA partnered with Code.org on the development of computer science and coding resources for teachers and students. NASA collaborated with LabXchange to develop free online resources for teachers and students on topics such as solar eclipses, Mars, astrobiology, and Artemis missions, with more than 700 resources available to date. Representative LEGO minifigures in front of European Service Module that will power the Orion spacecraft on Artemis II. Four LEGO minifigures will fly on Artemis I as part of the official flight kit, which carries mementos for educational outreach and posterity.
Credit: NASA/Radislav Sinyak There’s More to Explore With NASA
International educators and students can find even more ways to engage with NASA’s missions and content through these resources, available online to all.
For the youngest explorers, NASA Kids Club offers STEM-based games for students ages 3-9. The agency’s Artemis Camp Experience features hands-on activities designed to introduce K-12 students to the systems that will enable NASA astronauts to return to the Moon with Artemis. NASA’s “First Woman” graphic novel series tells the fictional story of Callie Rodriguez, the first woman to explore the Moon. Created for students in grades 5-12, “First Woman” includes graphic novels in English and Spanish along with accompanying videos, activities, and more. Through the agency’s internship opportunities, students gain authentic experience while being part of the agency’s work. Student challenges available internationally include the Human Exploration Rover Challenge, in which student teams create and test human-powered rovers, and the Space Apps Challenge, a hackathon that aims to solve real-world challenges on Earth and in space. NASA’s ASTRO CAMP Community Partners Program shares NASA STEM content and experiences through youth organizations and informal learning institutions such as museums and libraries, including nearly 30 international partner sites. Citizen scientists anywhere can contribute their local observations through the Global Learning and Observations to Benefit the Environment (GLOBE) Observer app, part of the GLOBE program sponsored by NASA, the National Oceanic and Atmospheric Administration, National Science Foundation, and Youth Learning as Citizen Environmental Scientists. Look up! Use the Spot the Station mobile app and website to know when the International Space Station will pass overhead. NASA is much more than astronauts and rocket scientists. The Surprisingly STEM video series highlights unexpected careers with linked hands-on activities. STEM resources for educators and students can be found anytime on NASA’s Learning Resources website. The agency offers video on demand through NASA+ with unique STEM programming, live coverage of NASA missions, and more. Students put their human-powered rover to the test in NASA’s Human Exploration Rover Challenge.
Credit: NASA Get NASA STEM Updates via Email
NASA STEM’s e-newsletters deliver the latest updates to email inboxes around the world. The NASA EXPRESS weekly e-newsletter offers the latest NASA STEM content and opportunities, while the monthly Earthrise e-newsletter offers themed resources to elevate Earth and climate science in the classroom.
Learn more about how NASA’s Office of STEM Engagement is inspiring Artemis Generation explorers at: https://www.nasa.gov/stem
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Last Updated Oct 02, 2024 Related Terms
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By NASA
4 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
Water piping is installed near the Thad Cochran Test Stand (B-1/B-2) at NASA’s Stennis Space Center in December 2014. The project to replace and upgrade the center’s high pressure industrial water system was a key milestone in preparations to test the SLS (Space Launch System) core stage ahead of the successful Artemis I launch.NASA/Danny Nowlin Employees install a 96-inch valve near the Thad Cochran Test Stand (B-1/B-2) at NASA’s Stennis Space Center as part of a high-pressure industrial water upgrade project in March 2015.NASA/Danny Nowlin In this March 2022 photo, crews use a shoring system to hold back soil as they install new 75-inch piping leading from the NASA Stennis High Pressure Industrial Water Facility to the valve vault pit serving the Fred Haise Test Stand.NASA/Danny Nowlin Crews use a specially designed tool to place a new pipeline liner inside the existing carrier pipe near the Fred Haise Test Stand in 2024 in the last phase of updating the original test complex industrial water system at NASA’s Stennis Space Center.NASA/Danny Nowlin Crews prepare new pipeline liner sections for installation near the Fred Haise Test Stand in 2024 in the last phase of updating the original test complex industrial water system at NASA’s Stennis Space Center.NASA/Danny Nowlin For almost 60 years, NASA’s Stennis Space Center has tested rocket systems and engines to help power the nation’s human space exploration dreams. Completion of a critical water system infrastructure project helps ensure the site can continue that frontline work moving forward.
“The infrastructure at NASA Stennis is absolutely critical for rocket engine testing for the agency and commercial companies,” said NASA project manager Casey Wheeler. “Without our high pressure industrial water system, testing does not happen. Installing new underground piping renews the lifespan and gives the center a system that can be operated for the foreseeable future, so NASA Stennis can add to its nearly six decades of contributions to space exploration efforts.”
The high pressure industrial water system delivers hundreds of thousands of gallons of water per minute through underground pipes to cool rocket engine exhaust and provide fire suppression capabilities during testing. Without the water flow, the engine exhaust, reaching as hot as 6,000 degrees Fahrenheit, could melt the test stand’s steel flame deflector.
Each test stand also features a FIREX system that holds water in reserve for use in the event of a mishap or fire. During SLS (Space Launch System) core stage testing, water also was used to create a “curtain” around the test hardware, dampening the high levels of noise generated during hot fire and lessening the video-acoustic impact that can cause damage to infrastructure and the test hardware.
Prior to the system upgrade, the water flow was delivered by the site’s original piping infrastructure built in the 1960s. However, that infrastructure had well exceeded its expected 30-year lifespan.
Scope of the Project
The subsequent water system upgrade was planned across multiple phases over a 10-year span. Crews worked around ever-changing test schedules to complete three major projects representing more than $50 million in infrastructure investment.
“Many people working the construction jobs for these projects are from the Gulf Coast area, so it has created jobs and work for the people doing the construction,” Wheeler said. “Some of the specialty work has had people coming in from all over the country, as well as vendors and suppliers that are supplying the materials, so that has an economic impact here too.”
Crews started by replacing large sections of piping, including a 96-inch line, from the 66-million-gallon onsite reservoir to the Thad Cochran (B-1/B-2) Test Stand. This phase also included the installation of a new 25,000-gallon electric pump at the High Pressure Industrial Water Facility to increase water flow capacity. The upgrades were critical for NASA Stennis to conduct Green Run testing of the SLS core stage in 2020-21 ahead of the successful Artemis I launch.
Work in the A Test Complex followed with crews replacing sections of 75-inch piping from the water plant and installing several new 66-inch gate valves.
In the final phase, crews used an innovative approach to install new steel liners within existing pipes leading to the Fred Haise Test Stand (formerly A-1 Test Stand). The work followed NASA’s completion of a successful RS-25 engine test campaign last April for future Artemis missions to the Moon and beyond. The stand now is being prepared to begin testing of new RS-25 flight engines.
Overall, the piping project represents a significant upgrade in design and materials. The new piping is made from carbon steel, with protective linings to prevent corrosion and gate valves designed to be more durable.
Importance of Water
It is hard to overstate the importance of the work to ensure ongoing water flow. For a typical 500-second RS-25 engine test on the Fred Haise Test Stand, around 5 million gallons of water is delivered from the NASA Stennis reservoir through a quarter-of-a-mile of pipe before entering the stand to supply the deflector and cool engine exhaust.
“Without water to cool the deflector and the critical parts of the test stand that will get hot from the hot fire itself, the test stand would need frequent corrective maintenance,” Wheeler said. “This system ensures the test stands remain in a condition where continuous testing can happen.”
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Last Updated Sep 26, 2024 EditorNASA Stennis CommunicationsContactC. Lacy Thompsoncalvin.l.thompson@nasa.gov / (228) 688-3333LocationStennis Space Center Related Terms
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By Space Force
A group of 18 personnel from the 4th Space Operations Squadron, a component of Delta 8, headquartered at Peterson Space Force Base, Colorado, recently traveled to Joint Base Pearl Harbor Hickam, Hawaii for a contingency operations exercise to test a highly technical piece of equipment known as a Mobile Constellation Control Station.
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