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By NASA
X-ray: NASA/CXC/Technion/N. Keshet et al.; Illustration: NASA/CXC/SAO/M. Weiss People often think about archaeology happening deep in jungles or inside ancient pyramids. However, a team of astronomers has shown that they can use stars and the remains they leave behind to conduct a special kind of archaeology in space.
Mining data from NASA’s Chandra X-ray Observatory, the team of astronomers studied the relics that one star left behind after it exploded. This “supernova archaeology” uncovered important clues about a star that self-destructed – probably more than a million years ago.
Today, the system called GRO J1655-40 contains a black hole with nearly seven times the mass of the Sun and a star with about half as much mass. However, this was not always the case.
Originally GRO J1655-40 had two shining stars. The more massive of the two stars, however, burned through all of its nuclear fuel and then exploded in what astronomers call a supernova. The debris from the destroyed star then rained onto the companion star in orbit around it, as shown in the artist’s concept.
This artist’s impression shows the effects of the collapse and supernova explosion of a massive star. A black hole (right) was formed in the collapse and debris from the supernova explosion is raining down onto a companion star (left), polluting its atmosphere.CXC/SAO/M. Weiss With its outer layers expelled, including some striking its neighbor, the rest of the exploded star collapsed onto itself and formed the black hole that exists today. The separation between the black hole and its companion would have shrunk over time because of energy being lost from the system, mainly through the production of gravitational waves. When the separation became small enough, the black hole, with its strong gravitational pull, began pulling matter from its companion, wrenching back some of the material its exploded parent star originally deposited.
While most of this material sank into the black hole, a small amount of it fell into a disk that orbits around the black hole. Through the effects of powerful magnetic fields and friction in the disk, material is being sent out into interstellar space in the form of powerful winds.
This is where the X-ray archaeological hunt enters the story. Astronomers used Chandra to observe the GRO J1655-40 system in 2005 when it was particularly bright in X-rays. Chandra detected signatures of individual elements found in the black hole’s winds by getting detailed spectra – giving X-ray brightness at different wavelengths – embedded in the X-ray light. Some of these elements are highlighted in the spectrum shown in the inset.
The team of astronomers digging through the Chandra data were able to reconstruct key physical characteristics of the star that exploded from the clues imprinted in the X-ray light by comparing the spectra with computer models of stars that explode as supernovae. They discovered that, based on the amounts of 18 different elements in the wind, the long-gone star destroyed in the supernova was about 25 times the mass of the Sun, and was much richer in elements heavier than helium in comparison with the Sun.
This analysis paves the way for more supernova archaeology studies using other outbursts of double star systems.
A paper describing these results titled “Supernova Archaeology with X-Ray Binary Winds: The Case of GRO J1655−40” was published in The Astrophysical Journal in May 2024. The authors of this study are Noa Keshet (Technion — Israel Institute of Technology), Ehud Behar (Technion), and Timothy Kallman (NASA’s Goddard Space Flight Center).
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:
https://www.nasa.gov/chandra
https://chandra.si.edu
Visual Description
This release features an artist’s rendering of a supernova explosion, inset with a spectrum graph.
The artist’s illustration features a star and a black hole in a system called GRO J1655-40. Here, the black hole is represented by a black sphere to our upper right of center. The star is represented by a bright yellow sphere to our lower left of center. In this illustration, the artist captures the immensely powerful supernova as a black hole is created from the collapse of a massive star, with an intense burst of blurred beams radiating from the black sphere. The blurred beams of red, orange, and yellow light show debris from the supernova streaking across the entire image in rippling waves. These beams rain debris on the bright yellow star.
When astronomers used the Chandra X-ray Observatory to observe the system in 2005, they detected signatures of individual elements embedded in the X-ray light. Some of those elements are highlighted in the spectrum graph shown in the inset, positioned at our upper lefthand corner.
The graph’s vertical axis, on our left, indicates X-ray brightness from 0.0 up to 0.7 in intensity units. The horizontal axis, at the bottom of the graph, indicates Wavelength from 6 to 12 in units of Angstroms. On the graph, a tight zigzagging line begins near the top of the vertical axis, and slopes down toward the far end of the horizontal axis. The sharp dips show wavelengths where the light has been absorbed by different elements, decreasing the X-ray brightness. Some of the elements causing these dips have been labeled, including Silicon, Magnesium, Iron, Nickel, Neon, and Cobalt.
News Media Contact
Megan Watzke
Chandra X-ray Center
Cambridge, Mass.
617-496-7998
mwatzke@cfa.harvard.edu
Lane Figueroa
Marshall Space Flight Center, Huntsville, Alabama
256-544-0034
lane.e.figueroa@nasa.gov
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By NASA
On March 6, 1985, NASA’s newest space shuttle, Atlantis, made its public debut during a rollout ceremony at the Rockwell International manufacturing plant in Palmdale, California. Under construction for three years, Atlantis joined NASA’s other three space-worthy orbiters, Columbia, Challenger, and Discovery, and atmospheric test vehicle Enterprise. Officials from NASA, Rockwell, and other organizations attended the rollout ceremony. By the time NASA retired Atlantis in 2011, it had flown 33 missions in a career spanning 26 years and flying many types of missions envisioned for the space shuttle. The Visitor Center at NASA’s Kennedy Space Center in Florida has Atlantis on display.
Space shuttle Atlantis under construction at Rockwell International’s Palmdale, California, plant in 1984. Credit/NASA. Atlantis during the rollout ceremony in Palmdale. Credit/NASA. Workers truck Atlantis from Palmdale to NASA’s Dryden, now Armstrong, Flight Research Center. Credit/NASA. On Jan. 25, 1979, NASA announced the names of the first four space-worthy orbiters – Columbia, Challenger, Discovery, and Atlantis. Like the other vehicles, NASA named Atlantis after an historical vessel of discovery and exploration – the Woods Hole Oceanographic Institute’s two-masted research ship Atlantis that operated from 1930 to 1966. On Jan. 29, NASA signed the contract with Rockwell International of Downey, California, to build and deliver Atlantis. Construction began in March 1980 and finished in April 1984. Nearly identical to Discovery but with the addition of hardware to support the cryogenic Centaur upper stage then planned to deploy planetary spacecraft in 1986, plans shelved following the Challenger accident. After a year of testing, workers prepared Atlantis for its public debut.
Atlantis arrives at NASA’s Dryden, now Armstrong, Flight Research Center to prepare for its cross-country ferry flight. Credit/NASA. Atlantis during an overnight stop at Ellington Air Force Base, now Ellington Field, in Houston. Credit/NASA. Atlantis arrives at NASA’s Kennedy Space Center in Florida.Credit/NASA. Three days after the rollout ceremony, workers trucked Atlantis 36 miles overland to NASA’s Dryden, now Armstrong, Flight Research Center at Edwards Air Force Base in California’s Mojave Desert, for final preparations for its cross-country ferry flight. In the Mate Demate Device, workers placed Atlantis atop the Shuttle Carrier Aircraft, a modified Boeing 747, to begin the ferry flight. The duo left Edwards on April 12, the fourth anniversary of the first space shuttle flight. Following an overnight stop at Houston’s Ellington Air Force Base, now Ellington Field, Atlantis arrived at NASA’s Kennedy Space Center in Florida on April 13.
Atlantis following its first rollout to Launch Pad 39A. Credit/NASA. The flight readiness firing of Atlantis’ three main engines.Credit/NASA. Liftoff of Atlantis on its first mission, STS-51J. Credit/NASA. Four months later, on Aug. 12, workers towed Atlantis from the processing facility to the assembly building and mated it to an external tank and twin solid rocket boosters. The entire stack rolled out to Launch Pad 39A on Aug. 30 in preparation for the planned Oct. 3 launch of the STS-51J mission. As with any new orbiter, on Sept. 13 NASA conducted a 20-second Flight Readiness Firing of Atlantis’ three main engines. On Sept. 16, the five-person crew participated in a countdown demonstration test, leading to an on time Oct. 3 launch. Atlantis had joined the shuttle fleet and begun its first mission to space.
Space shuttle Atlantis in the Visitor Center at NASA’s Kennedy Space Center in Florida. Credit/NASA. Over the course of its 33 missions spanning more than 26 years, Atlantis flew virtually every type of mission envisioned for the space shuttle, including government and commercial satellite deployments, deploying spacecraft to visit interplanetary destinations, supporting scientific missions, launching and servicing scientific observatories such as the Hubble Space Telescope, performing crew rotations and resupplying the Mir space station, and assembling and maintaining the International Space Station. Atlantis flew the final mission of the shuttle program, STS-135, in July 2011. The following year, NASA transported Atlantis to the Kennedy Visitor Center for public display.
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By NASA
4 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
The Project F.I.R.E. team, part of Falcon Research Labs and current students at Cerritos Community College in California, is researching the use of drones to extinguish fires as part of a NASA research award called the University Student Research Challenge. From left, Logan Stahl, Juan Villa, Angel Ortega, Larisa Mayoral, Jenny Escobar, and Paola Mayoral-Jimenez.Falcon Research Labs Great ideas, and the talent and passion that bring them to life, can be found anywhere.
In that spirit, NASA’s University Student Research Challenge (USRC) in 2024 selected its first group of community college students to contribute original research to the agency’s transformative vision for 21st century aviation.
The student-led group, from Cerritos Community College in California, is researching a new method of safely extinguishing wildfires using eco-friendly pellets dropped from uncrewed drones they call Project F.I.R.E. (Fire Intervention Retardant Expeller).
“Wildfires are a major problem we’re facing today,” said Angel Ortega, project technical director and lead research engineer for Project F.I.R.E. at Cerritos Community College. “The goal of our research is to demonstrate that our prototype drone with biodegradable fire retardant can successfully put out a controlled fire.”
A Community College First
Until now, USRC has only selected participants from traditional four-year institutions, compared to a two-year community college. This award exemplifies the activity’s goal of giving all of tomorrow’s aeronautical innovators a shot at NASA support for their research ideas.
“The University Innovation (UI) project provides a number of different avenues for students to contribute to aeronautics,” said Steven Holz, who manages the USRC award process. “All of the opportunities are different and help build knowledge and skills that would be advantageous to those wanting to continue working on UI opportunities or within NASA.”
This award is one of two from NASA’s USRC selected in 2024. The team received the USRC award prior to the devastating Los Angeles fires of January 2025.
“Our thoughts are with everyone affected by this tragedy,” members of the team said in a statement. “As a team, we are deeply committed to advancing innovative solutions to enhance safety and resilience, working toward a future where communities are better protected against such disasters.”
Innovating a Solution
The six team members of Project F.I.R.E. are driven by an ethic of public service. As fires continue to affect communities in their native southern California, they are applying their skills to finding a way to help.
“We want to get the public inspired that there are possible solutions at hand,” Ortega said. “And the work we’re doing now can hopefully build towards that bigger goal of a widespread solution.”
The research they are pursuing involves dropping biodegradable pellets into fires from uncrewed, autonomous drones. The pellets, upon reaching the ground, combine chemical ingredients which create a foamlike solution of fire retardant that will not contaminate the environment after the fire is extinguished.
Project F.I.R.E.’s innovative idea for fire suppression involves releasing eco-friendly foam pellets from uncrewed drones.Falcon Research Labs The team is keen to support firefighters and wildland fire managers and keep them safe while managing these natural disasters. The group has met with firefighters, discussed the idea with them, and received useful feedback on how to make the technology work best in the field.
Though the group is only at the outset of the research, their idea has existed for longer.
Blue Skies Forever
Prior to applying for a USRC, Project F.I.R.E. also presented at NASA’s 2024 Gateway to Blue Skies competition, in which they won the “Future Game-Changer” award.
Through Gateway to Blue Skies, NASA challenges college students to research climate-friendly technologies and applications related to the future of aviation and present them at an annual forum.
Following Project F.I.R.E.’s participation in the forum, they applied for a USRC grant to begin turning their vision into reality.
“Our experience with NASA has been incredibly supportive and inspiring,” said Logan Stahl, the project’s operations director. “We thought competing against some of the other schools would be intimidating, but the experience we’ve had is the complete opposite. Everyone was very welcoming, and the NASA representatives communicated with us and asked questions.”
The USRC support will allow the team to build on their earlier foundations, they said.
“Because Gateway to Blue Skies is more conceptual, it let us bring our idea to the table. Now through USRC, we can start building hands-on and make our idea come to life,” said Larisa Mayoral, chemical engineer and laboratory operations manager.
The Project F.I.R.E. team receives their “Future Game-Changer” award during the 2024 Gateway to Blue Skies forum held at NASA’s Ames Research Center in California.NASA / Brandon Torres The team expressed gratitude, speaking as community college students, for their ability to participate in and contribute research at a level that competes with top-brass universities.
“We’re very appreciative of our college and NASA providing us this opportunity,” said Paola Mayoral Jimenez, laboratory coordinator and safety manager. “By doing this project, we hope to shine a light on community colleges, their students, and what they have to offer.”
Complete details on USRC awardees and solicitations, such as what to include in a proposal and how to submit it, are available on the NASA Aeronautics Research Mission Directorate solicitation page.
About the Author
John Gould
Aeronautics Research Mission DirectorateJohn Gould is a member of NASA Aeronautics' Strategic Communications team at NASA Headquarters in Washington, DC. He is dedicated to public service and NASA’s leading role in scientific exploration. Prior to working for NASA Aeronautics, he was a spaceflight historian and writer, having a lifelong passion for space and aviation.
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Last Updated Feb 23, 2025 EditorJim BankeContactAngela Surgenorangela.d.surgenor@nasa.gov Related Terms
Aeronautics Aeronautics Research Mission Directorate Flight Innovation Transformative Aeronautics Concepts Program University Innovation University Student Research Challenge View the full article
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By Space Force
The DARC partnership is completing construction at the first of three sites that will host a global network of advanced ground-based sensors.
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