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Cassiopeia A, Then the Cosmos: 25 Years of Chandra X-ray Science
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By NASA
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Citizen Scientists Use NASA Open Science Data to Research Life in Space
2023 Workshop of Analysis Working Group members, Washington, D.C., November 14, 2023. Now, you are invited to join their quest to understand how life can thrive in deep space! Want to learn more first? Join our live virtual event April 17 at 3pm Eastern Time to hear an overview of the OSDR AWG’s operations. Photo: NASA OSDR Team How can life thrive in deep space? The Open Science Data Repository Analysis Working Groups invite volunteers from all backgrounds to help answer this question. Request to join these citizen science groups to help investigate how life adapts to space environments, exploring topics like radiation effects, microgravity’s impact on human and plant health, and how microbes change in orbit.
Currently, nine Analysis Working Groups (AWGs) hold monthly meetings to advance their specific focus areas. Participants collaborate using an online platform, the AWG “Forum-Space”, where they connect with peers and experts, join discussions, and contribute to over 20 active projects.
The AWGs work with data primarily from the NASA Open Science Data Repository (OSDR), a treasure trove of spaceflight data on physiology, molecular biology, bioimaging, and much more. For newcomers, there are tutorials and a comprehensive paper covering all aspects of the repository and the AWG community. You can explore 500+ studies, an omics multi-study visualization portal, the environmental data app, and RadLab, a portal for radiation telemetry data. (“Omics” refers to fields of biology that end in “omics,” like “genomics”.)
Each of the nine AWGs has a Lead who organizes their group and holds monthly virtual meetings. Once you join, make sure to connect with the Lead and get on the agenda so you can introduce yourself. Learn more about the AWGs here.
Have an idea for a new project? Propose a new project and help lead it! From data analysis and visualization to shaping data standards and conducting literature meta-analyses, there’s a place for everyone to contribute. Request to join, and together, we can address a great challenge for humanity: understanding and enabling life to thrive in deep space!
Want to learn more?
On April 17 at 3pm Eastern Time, the NASA Citizen Science Leaders Series is hosting an virtual event with Ryan Scott about these Analysis Working Groups and their work. Ryan is the Science Lead for the Ames Life Sciences Data Archive and the liaison between the Open Data Science Repository and the Analysis Working Groups. Click here to register for this event!
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Last Updated Apr 01, 2025 Related Terms
Citizen Science Biological & Physical Sciences Explore More
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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
NASA astronaut Butch Wilmore, left, Roscosmos cosmonaut Aleksandr Gorbunov, second from left, and NASA astronauts Nick Hague, second from right, and Suni Williams, right, are seen inside a SpaceX Dragon spacecraft shortly after splashing down off the coast of Florida, Tuesday, March 18, 2025. NASA’s SpaceX Crew-9 mission returned from a long-duration science expedition aboard the International Space Station. Photo Credit: (Credit: NASA).NASA/Keegan Barber After completing a long-duration stay aboard the International Space Station, NASA’s SpaceX Crew-9 astronauts will discuss their science mission during a postflight news conference at 2:30 p.m. EDT Monday, March 31, from the agency’s Johnson Space Center in Houston. Following the news conference, the crew will be available for a limited number of individual interviews at 3:30 p.m.
NASA astronauts Nick Hague, Suni Williams, and Butch Wilmore will answer questions about their time in space. The three NASA crew members and Roscosmos cosmonaut Aleksandr Gorbunov returned to Earth on March 18. Gorbunov will not participate in the news conference because of his travel schedule.
Watch live coverage on NASA+. Learn how to watch NASA content through a variety of additional platforms, including social media.
Media are invited to attend in person or virtually. U.S. media requesting in-person attendance or media seeking an interview with the crew must contact the NASA Johnson newsroom no later than 5 p.m. on Friday, March 28, at 281-483-5111 or jsccommu@mail.nasa.gov. A copy of NASA’s media accreditation policy is available on the agency’s website. Media participating by phone must dial into the news conference no later than 10 minutes before the start of the event to ask questions. Questions also may be submitted on social media using #AskNASA.
Hague and Gorbunov lifted off at 1:17 p.m. Sept. 28, 2024, on a SpaceX Falcon 9 rocket from Space Launch Complex 40 at Cape Canaveral Space Force Station in Florida. The next day, they docked to the forward-facing port of the station’s Harmony module. Williams and Wilmore launched aboard Boeing’s Starliner spacecraft and United Launch Alliance Atlas V rocket on June 5, 2024, from Space Launch Complex 41 as part of the agency’s Boeing Crew Flight Test. The duo arrived at the space station on June 6. In August, NASA announced the uncrewed return of Starliner to Earth and integrated Wilmore and Williams as part of the space station’s Expedition 71/72 for a return on Crew-9.
Williams and Wilmore traveled 121,347,491 miles during their mission, spent 286 days in space, and completed 4,576 orbits around Earth. Hague and Gorbunov traveled 72,553,920 miles during their mission, spent 171 days in space, and completed 2,736 orbits around Earth.
Hague, Williams, and Wilmore completed over 900 hours of research, conducting more than 150 unique experiments. During their time in orbit, the crew studied plant growth and development, tested stem cell technology to improve patient outcomes on Earth, and participated in research to understand how the space environment affects material degradation. They also performed a spacewalk and collected samples from the station’s exterior, studying the survivability of microorganisms in space. Additionally, the crew supported 30 ham radio events with students worldwide and conducted a student-led genetic experiment, helping to inspire the next generation of explorers.
NASA’s Commercial Crew Program has delivered on its goal of safe, reliable, and cost-effective transportation to and from the International Space Station from the United States through a partnership with American private industry. This partnership is changing the arc of human spaceflight history by opening access to low Earth orbit and the International Space Station to more people, more science, and more commercial opportunities. The space station remains the springboard to NASA’s next great leap in space exploration, including future missions to the Moon and, eventually, to Mars.
Find more information on NASA’s Commercial Crew Program at:
https://www.nasa.gov/commercialcrew
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Joshua Finch / Jimi Russell
Headquarters, Washington
202-358-1100
joshua.a.finch@nasa.gov / james.j.russell@nasa.gov
Courtney Beasley
Johnson Space Center, Houston
281-483-5111
courtney.m.beasley@nasa.gov
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Last Updated Mar 24, 2025 LocationNASA Headquarters Related Terms
Humans in Space International Space Station (ISS) Missions View the full article
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By NASA
On March 24, 1975, the last in a long line of super successful Saturn rockets rolled out from the vehicle assembly building to Launch Pad 39B at NASA’s Kennedy Space Center in Florida. The Saturn IB rocket for the Apollo-Soyuz Test Project was the 19th in the Saturn class stacked in the assembly building, beginning in 1966 with the Saturn V 500F facilities checkout vehicle. Thirteen flight Saturn V rockets followed, 12 to launch Apollo spacecraft and one to place the Skylab space station into orbit. In addition, workers stacked four flight Saturn IB rockets, three to launch crews to Skylab and one for Apollo-Soyuz, plus another for the Skylab rescue vehicle that was not needed and never launched. Previously, workers stacked Saturn I and Saturn IB rockets on the pads at Launch Complexes 34 and 37. With the successful liftoff in July 1975, the Saturn family of rockets racked up a 100 percent success rate of 32 launches.
Workers lower the Apollo command and service modules onto the spacecraft adaptor.NASA Technicians in the assembly building replace the fins on the Saturn IB rocket’s first stage. NASA Workers in the assembly building prepare to lower the spacecraft onto its Saturn IB rocket.NASA Inspections of the Saturn IB rocket’s first stage fins revealed hairline cracks in several hold-down fittings and managers ordered the replacement of all eight fins. While the cracks would not affect the flight of the rocket they bore the weight of the rocket on the mobile launcher. Workers finished the fin replacement on March 16. Engineers in Kennedy’s spacecraft operations building prepared the Apollo spacecraft for its historic space mission. By early March, they had completed checkout and assembly of the spacecraft and transported it to the assembly building on March 17 to mount it atop the Saturn IB’s second stage. Five days later, they topped off the rocket with the launch escape system.
The final Saturn IB begins its rollout from the vehicle assembly building. NASA The Saturn IB passes by the Launch Control Center. NASA Apollo astronauts Thomas Stafford, left, Vance Brand, and Donald “Deke” Slayton pose in front of their Saturn IB during the rollout.NASA On March 23, workers edged the mobile transporter carrying the Saturn IB just outside the assembly building’s High Bay 1, where engineers installed an 80-foot tall lightning mast atop the launch tower. The next morning, the stack continued its rollout to Launch Pad 39B with the prime crew of Thomas Stafford, Vance Brand, and Donald “Deke” Slayton and support crew members Robert Crippen and Richard Truly on hand to observe. About 7,500 people, including guests, dependents of Kennedy employees and NASA Tours patrons, watched as the stack moved slowly out of the assembly building on its five-mile journey to the launch pad.
Mission Control in Houston during the joint simulation with Flight Director Donald Puddy in striped shirt and a view of Mission Control in Moscow on the large screen at left. NASA A group of Soviet flight controllers in a support room in Mission Control in Houston during the joint simulation. NASA On March 20, flight controllers and crews began a series of joint simulations for the joint mission scheduled for July 1975. For the six days of simulations, cosmonauts Aleksei Leonov and Valeri Kubasov and astronauts Stafford, Brand, and Slayton participated in the activity in spacecraft simulators in their respective countries, with both control centers in Houston and outside Moscow fully staffed as if for the actual mission. The exercises simulated various phases of the mission, including the respective launches, rendezvous and docking, crew transfers and joint operations, and undocking.
Astronauts Thomas Stafford, left, Vance Brand, and Donald “Deke” Slayton in a boilerplate Apollo command module preparing for the water egress training. NASA Stafford, left, Slayton, and Brand in the life raft during water egress training. NASA Astronauts Stafford, Brand and Slayton participated in a water egress training activity on March 8, completing the exercise in a water tank in Building 260 at NASA’s Johnson Space Center in Houston. The astronauts practiced egressing from their spacecraft onto a lift raft and being lifted up with the use of a Billy Pugh rescue net. They practiced wearing their flight coveralls as well as their spacesuits.
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By NASA
On March 23, 1965, the United States launched the Gemini III spacecraft with astronauts Virgil “Gus” Grissom and John Young aboard, America’s first two-person spaceflight. Grissom earned the honor as the first person to enter space twice and Young as the first member of the second group of astronauts to fly in space. During their three-orbit flight they carried out the first orbital maneuvers of a crewed spacecraft, a critical step toward demonstrating rendezvous and docking. Grissom and Young brought Gemini 3 to a safe splashdown in the Atlantic Ocean. Their ground-breaking mission led the way to nine more successful Gemini missions in less than two years to demonstrate the techniques required for a Moon landing. Gemini 3 marked the last spaceflight controlled from Cape Kennedy, that function shifting permanently to a new facility in Houston.
In one of the first uses of the auditorium at the Manned Spacecraft Center, now NASA’s Johnson Space Center in Houston, managers announce the prime and backup Gemini III crews. NASA NASA astronauts Virgil “Gus” Grissom and John Young, the Gemini III prime crew. NASA Grissom, foreground, and Young in their capsule prior to launch.NASA On April 13, 1964, just five days after the uncrewed Gemini I mission, in the newly open auditorium at the Manned Spacecraft Center, now NASA’s Johnson Space Center in Houston, Director Robert Gilruth introduced the Gemini III crew to the press. NASA assigned Mercury 4 veteran Grissom and Group 2 astronaut Young as the prime crew, with Mercury 8 veteran Walter Schirra and Group 2 astronaut Thomas Stafford serving as their backups. The primary goals of Project Gemini included proving the techniques required for the Apollo Program to fulfil President John F. Kennedy’s goal of landing a man on the Moon and returning him safely to Earth before the end of the 1960s. Demonstrating rendezvous and docking between two spacecraft ranked as a high priority for Project Gemini.
Liftoff of Gemini III.NASA The uncrewed Gemini I and II missions validated the spacecraft’s design, reliability, and heat shield, clearing the way to launch Gemini III with a crew. On March 23, 1965, after donning their new Gemini spacesuits, Grissom and Young rode the transfer van to Launch Pad 19 at Cape Kennedy in Florida. They rode the elevator to their Gemini spacecraft atop its Titan II rocket where technicians assisted them in climbing into the capsule. At 9:24 a.m. EST, the Titan’s first stage engines ignited, and Gemini III rose from the launch pad.
The Mission Control Center at Cape Kennedy in Florida during Gemini III, controlling a human spaceflight for the final time.NASA The Mission Control Center at the Manned Spacecraft Center, now NASA’s Johnson Space Center in Houston, monitoring the Gemini III mission.NASA Five and a half minutes after launch, the Titan II’s second stage engine cut off and the spacecraft separated to begin its orbital journey. Grissom became the first human to enter space a second time. While engineers monitored the countdown from the Launch Pad 19 blockhouse, once in orbit flight controllers in the Mission Control Center at the Cape took over. Controllers in the new Mission Control Center at the Manned Spacecraft Center, now the Johnson Space Center in Houston, staffed consoles and monitored the mission in a backup capacity. Beginning with Gemini IV, control of all American human spaceflights shifted permanently to the Houston facility.
Gemini III entered an orbit of 100 miles by 139 miles above the Earth. Near the end of the first orbit, while passing over Texas, Grissom and Young fired their spacecraft’s thrusters for one minute, 14 seconds. “They appear to be firing good,” said Young, confirming the success of the maneuver. The change in velocity adjusted their orbit to 97 miles by 105 miles. A second burn 45 minutes later altered the orbital inclination by 0.02 degrees. Another task for the crew involved testing new food and packaging developed for Gemini. As an off-the-menu item, Young had stowed a corned beef on rye sandwich in his suit pocket before flight, and both he and Grissom took a bite before stowing it away, concerned about crumbs from the sandwich floating free in the cabin.
Shortly after splashdown, Gemini III astronaut Virgil “Gus” Grissom exits the spacecraft as crewmate John Young waits in the life raft. NASA Sailors hoist the Gemini III spacecraft aboard the prime recovery ship U.S.S. Intrepid.NASA Young, left, and Grissom stand with their spacecraft aboard Intrepid. NASA Near the end of their third revolution, Grissom and Young prepared for the retrofire burn to bring them out of orbit. They oriented Gemini III with its blunt end facing forward and completed a final orbital maneuver to lower the low point of their orbit to 45 miles, ensuring reentry even if the retrorockets failed to fire. They jettisoned the rearmost adapter section, exposing the retrorockets that fired successfully, bringing the spacecraft out of orbit. They jettisoned the retrograde section, exposing Gemini’s heat shield. Minutes later, they encountered the upper layers of Earth’s atmosphere at 400,000 feet, and he buildup of ionized gases caused a temporary loss of communication between the spacecraft and Mission Control. At 50,000 feet, Grissom deployed the drogue parachute to stabilize and slow the spacecraft, followed by the main parachute at 10,600 feet. Splashdown occurred in the Atlantic Ocean near Grand Turk Island, about 52 miles short of the planned point, after a flight of 4 hours, 52 minutes, 31 seconds.
Gemini III astronauts Virgil “Gus” Grissom, left, and John Young upon their return to Cape Kennedy in Florida. NASA Grissom and Young at the postflight press conference. NASA The welcome home ceremony for Grissom and Young at the Manned Spacecraft Center, now NASA’s Johnson Space Center in Houston.NASA A helicopter recovered Grissom and Young and delivered them to the deck of the U.S.S. Intrepid, arriving there one hour and 12 minutes after splashdown. On board the carrier, the astronauts received a medical checkup and a telephone call from President Lyndon B. Johnson. The ship sailed to pick up the spacecraft and sailors hoisted it aboard less than three hours after landing. The day after splashdown, Grissom and Young flew to Cape Kennedy for debriefings, a continuation of the medical examinations begun on the carrier, and a press conference. Following visits to the White House, New York, and Chicago, the astronauts returned home to Houston on March 31. The next day, Gilruth welcomed them back to the Manned Spacecraft Center, where in front of the main administration building, workers raised an American flag that Grissom and Young had carried on their mission. That flag flew during every subsequent Gemini mission.
During the Gemini III welcome home ceremony in front of the main administration building at the Manned Spacecraft Center, now NASA’s Johnson Space Center in Houston, workers raise an American flag that the astronauts had carried on their mission. NASA
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