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By NASA
Tiny satellites, also known as CubeSats, are pictured after being deployed into Earth orbit from a small satellite orbital deployer on the outside of the International Space Station’s Kibo laboratory module. The CubeSats were delivered aboard the Northrop Grumman Cygnus space freighter and will serve a variety of educational and research purposes for public and private organizations around the world.
Image Credit: NASA/Tracy Dyson
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By European Space Agency
The two new Galileo satellites launched in April have entered service, completing the second of three constellation planes. With every addition to the constellation, the precision, availability and robustness of the Galileo signal is improved. The next launch is planned in the coming weeks and the remaining six Galileo First Generation satellites will join the constellation in the next years.
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By NASA
5 Min Read Webb Finds Early Galaxies Weren’t Too Big for Their Britches After All
This image shows a small portion of the field observed by NASA’s James Webb Space Telescope’s NIRCam (Near-Infrared Camera) for the Cosmic Evolution Early Release Science (CEERS) survey. The full image appears below. Credits:
NASA, ESA, CSA, S. Finkelstein (University of Texas) It got called the crisis in cosmology. But now astronomers can explain some surprising recent discoveries.
When astronomers got their first glimpses of galaxies in the early universe from NASA’s James Webb Space Telescope, they were expecting to find galactic pipsqueaks, but instead they found what appeared to be a bevy of Olympic bodybuilders. Some galaxies appeared to have grown so massive, so quickly, that simulations couldn’t account for them. Some researchers suggested this meant that something might be wrong with the theory that explains what the universe is made of and how it has evolved since the big bang, known as the standard model of cosmology.
According to a new study in the Astrophysical Journal led by University of Texas at Austin graduate student Katherine Chworowsky, some of those early galaxies are in fact much less massive than they first appeared. Black holes in some of these galaxies make them appear much brighter and bigger than they really are.
“We are still seeing more galaxies than predicted, although none of them are so massive that they ‘break’ the universe,” Chworowsky said.
The evidence was provided by Webb’s Cosmic Evolution Early Release Science (CEERS) Survey, led by Steven Finkelstein, a professor of astronomy at UT Austin and study co-author.
Image A : CEERS Deep Field (NIRCam)
This image shows a small portion of the field observed by NASA’s James Webb Space Telescope’s NIRCam (Near-Infrared Camera) for the Cosmic Evolution Early Release Science (CEERS) survey. It is filled with galaxies. Some galaxies appear to have grown so massive, so quickly, that simulations couldn’t account for them. However, a new study finds that some of those early galaxies are in fact much less massive than they first appeared. Black holes in some of those galaxies make them appear much brighter and bigger than they really are. NASA, ESA, CSA, S. Finkelstein (University of Texas)
View 8k pixel full resolution version of the image
Black Holes Add to Brightness
According to this latest study, the galaxies that appeared overly massive likely host black holes rapidly consuming gas. Friction in the fast-moving gas emits heat and light, making these galaxies much brighter than they would be if that light emanated just from stars. This extra light can make it appear that the galaxies contain many more stars, and hence are more massive, than we would otherwise estimate. When scientists remove these galaxies, dubbed “little red dots” (based on their red color and small size), from the analysis, the remaining early galaxies are not too massive to fit within predictions of the standard model.
“So, the bottom line is there is no crisis in terms of the standard model of cosmology,” Finkelstein said. “Any time you have a theory that has stood the test of time for so long, you have to have overwhelming evidence to really throw it out. And that’s simply not the case.”
Efficient Star Factories
Although they’ve settled the main dilemma, a less thorny problem remains: There are still roughly twice as many massive galaxies in Webb’s data of the early universe than expected from the standard model. One possible reason might be that stars formed more quickly in the early universe than they do today.
“Maybe in the early universe, galaxies were better at turning gas into stars,” Chworowsky said.
Star formation happens when hot gas cools enough to succumb to gravity and condense into one or more stars. But as the gas contracts, it heats up, generating outward pressure. In our region of the universe, the balance of these opposing forces tends to make the star formation process very slow. But perhaps, according to some theories, because the early universe was denser than today, it was harder to blow gas out during star formation, allowing the process to go faster.
More Evidence of Black Holes
Concurrently, astronomers have been analyzing the spectra of “little red dots” discovered with Webb, with researchers in both the CEERS team and others finding evidence of fast-moving hydrogen gas, a signature of black hole accretion disks. This supports the idea that at least some of the light coming from these compact, red objects comes from gas swirling around black holes, rather than stars – reinforcing Chworowsky and their team’s conclusion that they are probably not as massive as astronomers initially thought. However, further observations of these intriguing objects are incoming, and should help solve the puzzle about how much light comes from stars versus gas around black holes.
Often in science, when you answer one question, that leads to new questions. While Chworowsky and their colleagues have shown that the standard model of cosmology likely isn’t broken, their work points to the need for new ideas in star formation.
“And so there is still that sense of intrigue,” Chworowsky said. “Not everything is fully understood. That’s what makes doing this kind of science fun, because it’d be a terribly boring field if one paper figured everything out, or there were no more questions to answer.”The James Webb Space Telescope is the world’s premier space science observatory. Webb is solving mysteries in our solar system, looking beyond to distant worlds around other stars, and probing the mysterious structures and origins of our universe and our place in it. Webb is an international program led by NASA with its partners, ESA (European Space Agency) and CSA (Canadian Space Agency).
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Media Contacts
Laura Betz – laura.e.betz@nasa.gov, Rob Gutro – rob.gutro@nasa.gov
NASA’s Goddard Space Flight Center, Greenbelt, Md.
Marc Airhart – mairhart@austin.utexas.edu
University of Texas at Austin
Christine Pulliam – cpulliam@stsci.edu
Space Telescope Science Institute, Baltimore, Md.
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Last Updated Aug 26, 2024 Editor Stephen Sabia Contact Laura Betz laura.e.betz@nasa.gov Related Terms
Astrophysics Galaxies Galaxies, Stars, & Black Holes Galaxies, Stars, & Black Holes Research Goddard Space Flight Center James Webb Space Telescope (JWST) Science & Research The Universe View the full article
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By NASA
4 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
By Jessica Barnett
From Earth, one might be tempted to view the Sun as a unique celestial object like no other, as it’s the star our home planet orbits and the one our planet relies on most for heat and light. But if you took a step back and compared the Sun to the other stars NASA has studied over the years, how would it compare? Would it still be so unique?
The Full-sun Ultraviolet Rocket SpecTrograph (FURST) aims to answer those questions when it launches aboard a Black Brant IX sounding rocket Aug. 11 at White Sands Missile Range in New Mexico.
“When we talk about ‘Sun as a star’, we’re treating it like any other star in the night sky as opposed to the unique object we rely on for human life. It’s so exciting to study the Sun from that vantage point,” said Adam Kobelski, institutional principal investigator for FURST and a research astrophysicist at NASA’s Marshall Space Flight Center in Huntsville, Alabama.
The Full-sun Ultraviolet Rocket SpecTrograph (FURST) undergoes testing at White Sands Missile Range in New Mexico in preparation for launch on Aug. 11. FURST will be launched aboard a Black Bryant IX sounding rocket and will observe the Sun in vacuum ultraviolet (VUV). The instrument was designed and built at Montana State University. NASA Marshall provided the camera, supplied avionics, and designed and built its calibration system. Credit: Montana State University FURST will obtain the first high-resolution spectra of the “Sun as a star” in vacuum ultraviolet (VUV), a light wavelength that is absorbed in Earth’s atmosphere meaning it can only be observed from space. Astronomers have studied other stars in the vacuum ultraviolet with orbiting telescopes, however these instruments are too sensitive to be pointed to the Sun. The recent advancements in high-resolution VUV spectroscopy now allow for the same observations of our own star, the Sun.
“These are wavelengths that Hubble Space Telescope is really great at observing, so there is a decent amount of Hubble observations of stars in ultraviolet wavelengths, but we don’t have comparable observations of our star in this wavelength range,” said Kobelski. Marshall was the lead field center for the design, development, and construction of the Hubble Space Telescope.
Because Hubble is too sensitive to point at Earth’s Sun, new instruments were needed to get a spectrum of the entire Sun that is of a similar quality to Hubble’s observations of other stars. Marshall built the camera, supplied avionics, and designed and built a new calibration system for the FURST mission. Montana State University (MSU), which leads the FURST mission in partnership with Marshall, built the optical system, which includes seven optics that will feed into the camera that will essentially create seven exposures, covering the entire ultraviolet wavelength range.
Charles Kankelborg, a heliophysics professor at MSU and principal investigator for FURST, described the mission as a very close collaboration with wide-ranging implications.
“Our mission will obtain the first far ultraviolent spectrum of the Sun as a star,” Kankelborg said. “This is a key piece of information that has been missing for decades. With it, we will place the Sun in context with other stars.”
Kobelski echoed the sentiment.
“How well do the observations and what we know about our Sun compare to our observations or what we know of other stars?” Kobelski said. “You’d expect that we know all this information about the Sun – it’s right there – but it turns out, we actually don’t. If we can get these same observations or same wavelengths as we’ve observed from these other sources, we can start to connect the dots and connect our Sun to other stars.”
Montana State University alumnus Jake Davis, left, Professor Charles Kankelborg, and doctoral students Catharine “Cappy” Bunn and Suman Panda, pose at White Sands Missile Range in New Mexico, where they are preparing for the launch of the FURST rocket mission to observe the sun in far ultraviolet.Credit: Montana State University FURST will be the third launch led by Marshall for NASA’s Sounding Rocket Program within five months, making 2024 an active year for the program. Like the Hi-C Flare mission that launched in April, the sounding rocket will launch and open during flight to allow FURST to observe the Sun for approximately five minutes before closing and falling back to Earth’s surface. Marshall team members will be able to calibrate the instruments during launch and flight, as well as retrieve data during flight and soon after landing.
Kobelski and Kankelborg each said they’re grateful for the opportunity to fill the gaps in our knowledge of Earth’s Sun.
The launch will be livestreamed on Sunday, Aug. 11, with a launch window of 11:40 a.m.– 12:40 p.m. CDT. Tune in on NASA’s White Sands Test Facility Launch Channel.
The FURST mission is led by Marshall in partnership with Montana State University in Bozeman, Montana, with additional support from the NASA’s Sounding Rockets Office and the U.S. National Center for Atmospheric Research’s High Altitude Observatory. Launch support is provided at White Sands Missile Range in New Mexico by NASA’s Johnson Space Center. NASA’s Sounding Rocket Program is managed by the agency’s Heliophysics Division.
Lane Figueroa
Marshall Space Flight Center, Huntsville, Ala.
256.544.0034
lane.e.figueroa@nasa.gov
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Last Updated Aug 09, 2024 EditorBeth RidgewayLocationMarshall Space Flight Center Related Terms
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4 min read NASA to Launch 8 Scientific Balloons From New Mexico
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By NASA
This final image captured by NASA’s NEOWISE shows part of the Fornax constellation in the Southern Hemisphere. Processed by IPAC at Caltech, this is the mission’s 26,886,704th exposure. It was taken by the spacecraft just before 3 a.m. EDT on Aug. 1, when the mission’s survey ended.Credits: NASA/JPL-Caltech/IPAC/UCLA Engineers on NASA’s NEOWISE (Near-Earth Object Wide-field Infrared Survey Explorer) mission commanded the spacecraft to turn its transmitter off for the last time Thursday. This concludes more than 10 years of its planetary defense mission to search for asteroids and comets, including those that could pose a threat to Earth.
The final command was sent from the Earth Orbiting Missions Operation Center at NASA’s Jet Propulsion Laboratory in Southern California, with mission members past and present in attendance alongside officials from the agency’s headquarters in Washington. NASA’s Tracking and Data Relay Satellite System then relayed the signal to NEOWISE, decommissioning the spacecraft. As NASA previously shared, the spacecraft’s science survey ended on July 31, and all remaining science data was downlinked from the spacecraft.
“The NEOWISE mission has been an extraordinary success story as it helped us better understand our place in the universe by tracking asteroids and comets that could be hazardous for us on Earth,” said Nicola Fox, associate administrator, Science Mission Directorate at NASA Headquarters. “While we are sad to see this brave mission come to an end, we are excited for the future scientific discoveries it has opened by setting the foundation for the next generation planetary defense telescope.”
NASA ended the mission because NEOWISE will soon drop too low in its orbit around Earth to provide usable science data. An uptick in solar activity is heating the upper atmosphere, causing it to expand and create drag on the spacecraft, which does not have a propulsion system to keep it in orbit. Now decommissioned, NEOWISE is expected to safely burn up in our planet’s atmosphere in late 2024.
During its operational lifetime, the infrared survey telescope exceeded scientific objectives for not one but two missions, starting with the WISE (Wide-field Infrared Survey Explorer) mission. Managed by JPL, WISE launched in December 2009 with a seven-month mission to scan the entire infrared sky. By July 2010, WISE had accomplished this with far greater sensitivity than previous surveys. A few months later, the telescope ran out of the coolant that kept heat produced by the spacecraft from interfering with its infrared observations. (Invisible to the human eye, infrared wavelengths are associated with heat.)
NASA extended the mission under the name NEOWISE until February 2011 to complete a survey of the main belt asteroids, at which point the spacecraft was put into hibernation. Analysis of this data showed that although the lack of coolant meant the space telescope could no longer observe the faintest infrared objects in the universe, it could still make precise observations of asteroids and comets that generate a strong infrared signal from being heated by the Sun as they travel past our planet.
NASA brought the telescope out of hibernation in 2013 under the Near-Earth Object Observations Program, a precursor for the agency’s Planetary Defense Coordination Office, to continue the NEOWISE survey of asteroids and comets in the pursuit of planetary defense.
“The NEOWISE mission has been instrumental in our quest to map the skies and understand the near-Earth environment. Its huge number of discoveries have expanded our knowledge of asteroids and comets, while also boosting our nation’s planetary defense,” said Laurie Leshin, director, NASA JPL. “As we bid farewell to NEOWISE, we also celebrate the team behind it for their impressive achievements.”
By repeatedly observing the sky from low Earth orbit, NEOWISE created all-sky maps featuring 1.45 million infrared measurements of more than 44,000 solar system objects. Of the 3,000-plus near-Earth objects it detected, 215 were first spotted by NEOWISE. The mission also discovered 25 new comets, including the famed comet C/2020 F3 NEOWISE that streaked across the night sky in the summer of 2020.
In addition to leaving behind a trove of science data, the spacecraft has helped inform the development of NASA’s first infrared space telescope purpose-built for detecting near-Earth objects: NEO Surveyor.
“The NEOWISE mission has provided a unique, long-duration data set of the infrared sky that will be used by scientists for decades to come,” said Amy Mainzer, principal investigator for both NEOWISE and NEO Surveyor at the University of California, Los Angeles. “But its additional legacy is that it has helped lay the groundwork for NASA’s next planetary defense infrared space telescope.”
Also managed by JPL, NEO Surveyor will seek out some of the hardest-to-find near-Earth objects, such as dark asteroids and comets that don’t reflect much visible light, as well as objects that approach Earth from the direction of the Sun. The next-generation infrared space telescope will greatly enhance the capabilities of the international planetary defense community, which includes NASA-funded ground surveys. Construction of NEO Surveyor is already well under way, with a launch date set for no earlier than 2027.
More Mission Information
The NEOWISE and NEO Surveyor missions support the objectives of NASA’s Planetary Defense Coordination Office at the agency’s headquarters. The NASA Authorization Act of 2005 directed NASA to discover and characterize at least 90% of the near-Earth objects more than 460 feet (140 meters) across that come within 30 million miles (48 million kilometers) of our planet’s orbit. Objects of this size can cause significant regional damage, or worse, should they impact the Earth.
NASA JPL manages and operates the NEOWISE mission for the agency’s Planetary Defense Coordination Office within the Science Mission Directorate. The Space Dynamics Laboratory in Logan, Utah, built the science instrument. BAE Systems of Boulder, Colorado, built the spacecraft. Science data processing, archiving, and distribution is done at IPAC at Caltech in Pasadena, California. Caltech manages JPL for NASA.
To learn more about NEOWISE, visit:
https://www.nasa.gov/neowise
-end-
Karen Fox / Alana Johnson
Headquarters, Washington
202-358-1600
karen.c.fox@nasa.gov / alana.r.johnson@nasa.gov
Ian J. O’Neill
Jet Propulsion Laboratory, Pasadena, Calif.
818-354-2649
ian.j.oneill@jpl.nasa.gov
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Last Updated Aug 08, 2024 LocationNASA Headquarters Related Terms
NEOWISE Jet Propulsion Laboratory NASA Headquarters NEO Surveyor (Near-Earth Object Surveyor Space Telescope) Planetary Defense Coordination Office Planetary Science Division Science & Research Science Mission Directorate WISE (Wide-field Infrared Survey Explorer) View the full article
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