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Cosmic Magnifying Glasses Yield Independent Measure of Universe's Expansion
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By NASA
5 Min Read NASA’s Webb Reveals Distorted Galaxy Forming Cosmic Question Mark
The galaxy cluster MACS-J0417.5-1154. Full image below. Credits:
NASA, ESA, CSA, STScI, V. Estrada-Carpenter (Saint Mary’s University). It’s 7 billion years ago, and the universe’s heyday of star formation is beginning to slow. What might our Milky Way galaxy have looked like at that time? Astronomers using NASA’s James Webb Space Telescope have found clues in the form of a cosmic question mark, the result of a rare alignment across light-years of space.
“We know of only three or four occurrences of similar gravitational lens configurations in the observable universe, which makes this find exciting, as it demonstrates the power of Webb and suggests maybe now we will find more of these,” said astronomer Guillaume Desprez of Saint Mary’s University in Halifax, Nova Scotia, a member of the team presenting the Webb results.
Image A: Lensed Question Mark (NIRCam)
The galaxy cluster MACS-J0417.5-1154 is so massive it is warping the fabric of space-time and distorting the appearance of galaxies behind it, an effect known as gravitational lensing. This natural phenomenon magnifies distant galaxies and can also make them appear in an image multiple times, as NASA’s James Webb Space Telescope saw here. Two distant, interacting galaxies — a face-on spiral and a dusty red galaxy seen from the side — appear multiple times, tracing a familiar shape across the sky. Active star formation, and the face-on galaxy’s remarkably intact spiral shape, indicate that these galaxies’ interaction is just beginning. NASA, ESA, CSA, STScI, V. Estrada-Carpenter (Saint Mary’s University). While this region has been observed previously with NASA’s Hubble Space Telescope, the dusty red galaxy that forms the intriguing question-mark shape only came into view with Webb. This is a result of the wavelengths of light that Hubble detects getting trapped in cosmic dust, while longer wavelengths of infrared light are able to pass through and be detected by Webb’s instruments.
Astronomers used both telescopes to observe the galaxy cluster MACS-J0417.5-1154, which acts like a magnifying glass because the cluster is so massive it warps the fabric of space-time. This allows astronomers to see enhanced detail in much more distant galaxies behind the cluster. However, the same gravitational effects that magnify the galaxies also cause distortion, resulting in galaxies that appear smeared across the sky in arcs and even appear multiple times. These optical illusions in space are called gravitational lensing.
The red galaxy revealed by Webb, along with a spiral galaxy it is interacting with that was previously detected by Hubble, are being magnified and distorted in an unusual way, which requires a particular, rare alignment between the distant galaxies, the lens, and the observer — something astronomers call a hyperbolic umbilic gravitational lens. This accounts for the five images of the galaxy pair seen in Webb’s image, four of which trace the top of the question mark. The dot of the question mark is an unrelated galaxy that happens to be in the right place and space-time, from our perspective.
Image B: Hubble and Webb Side by Side
Image Before/After In addition to producing a case study of the Webb NIRISS (Near-Infrared Imager and Slitless Spectrograph) instrument’s ability to detect star formation locations within a galaxy billions of light-years away, the research team also couldn’t resist highlighting the question mark shape. “This is just cool looking. Amazing images like this are why I got into astronomy when I was young,” said astronomer Marcin Sawicki of Saint Mary’s University, one of the lead researchers on the team.
“Knowing when, where, and how star formation occurs within galaxies is crucial to understanding how galaxies have evolved over the history of the universe,” said astronomer Vicente Estrada-Carpenter of Saint Mary’s University, who used both Hubble’s ultraviolet and Webb’s infrared data to show where new stars are forming in the galaxies. The results show that star formation is widespread in both. The spectral data also confirmed that the newfound dusty galaxy is located at the same distance as the face-on spiral galaxy, and they are likely beginning to interact.
“Both galaxies in the Question Mark Pair show active star formation in several compact regions, likely a result of gas from the two galaxies colliding,” said Estrada-Carpenter. “However, neither galaxy’s shape appears too disrupted, so we are probably seeing the beginning of their interaction with each other.”
“These galaxies, seen billions of years ago when star formation was at its peak, are similar to the mass that the Milky Way galaxy would have been at that time. Webb is allowing us to study what the teenage years of our own galaxy would have been like,” said Sawicki.
The Webb images and spectra in this research came from the Canadian NIRISS Unbiased Cluster Survey (CANUCS). The research paper is published in the Monthly Notices of the Royal Astronomical Society.
Image C: Wide Field – Lensed Question Mark (NIRCam)
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.
Christine Pulliam – cpulliam@stsci.edu , Leah Ramsey – lramsey@stsci.edu
Space Telescope Science Institute, Baltimore, Md.
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Last Updated Sep 04, 2024 Editor Stephen Sabia Contact Laura Betz laura.e.betz@nasa.gov Related Terms
Astrophysics Galaxies Galaxies, Stars, & Black Holes Galaxy clusters Goddard Space Flight Center Gravitational Lensing James Webb Space Telescope (JWST) Science & Research The Universe View the full article
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By NASA
Learn Home New TEMPO Cosmic Data Story… Astrophysics Overview Learning Resources Science Activation Teams SME Map Opportunities More Science Stories Science Activation Highlights Citizen Science 3 min read
New TEMPO Cosmic Data Story Makes Air Quality Data Publicly Available
On May 30th, 2024, NASA and the Center for Astrophysics | Harvard & Smithsonian announced the public release of “high-quality, near real-time air quality data” from NASA’s TEMPO (Tropospheric Emissions: Monitoring of Pollution) mission. The NASA Science Activation program’s Cosmic Data Stories team, led by Harvard University in Cambridge, MA, has since released a new “Data Story” – an interactive, digital showcase of new science imagery, including ideas for exploration and scientific highlights shared in a brief video and narrative text – that provides a quick and easy way for the public to visualize this important, large data set from TEMPO.
TEMPO allows unprecedented monitoring of air quality down to neighborhood scales, with its hourly daytime scans over North America. Air pollutants like NO2, produced, for example, by the burning of fossil fuels, can trigger significant health issues, especially among people with pre-existing illnesses such as asthma. The interactive views in the TEMPO Data Story provide public access to the same authentic data that scientists use and invite the public to explore patterns in their local air quality. For example, how do NO2 emissions vary in our area throughout the day and week? What are possible sources of NO2 in our community? How does our air quality compare with that of other communities with similar population densities, or with nearby urban or rural communities? TEMPO’s hyper-localized data will allow communities to make informed decisions and take action to improve their air quality.
The Cosmic Data Story team is grateful to TEMPO scientists, Xiong Liu and Caroline Nowlan, for providing the team with early access to the data and guidance on NO2 phenomena that learners can explore in the data. The TEMPO Data Story, featured on TEMPO’s webpage for the public, adds Earth science data to the portfolio of Cosmic Data Stories that is already making astrophysics data accessible to the public.
TEMPO Team Atmospheric Physicist from the Harvard-Smithsonian Center for Astrophysics, Caroline Nowlan, had this to say: “TEMPO produces data that are really useful for scientists, but are also important for the general public and policy makers. We are thrilled that the Cosmic Data Stories team has made a tool that allows everyone to explore TEMPO data and learn about pollution across North America and in their own communities.”
The Cosmic Data Stories project is supported by NASA under cooperative agreement award number 80NSSC21M0002 and is part of NASA’s Science Activation Portfolio. Learn more about how Science Activation connects NASA science experts, real content, and experiences with community leaders to do science in ways that activate minds and promote deeper understanding of our world and beyond: https://science.nasa.gov/learn
A view from the TEMPO Data Story, shows TEMPO’s NO2 data overlaid on a map of North America. A large plume of NO2, caused by large wildfires, arcs from Northern California all the way to Idaho. Other “hot spots” of NO2 are seen over cities across the US, Canada, and Mexico. Users can view any available date, as well as explore some featured dates and locations that describe phenomena of interest that are visible in the data. Share
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Last Updated Aug 13, 2024 Editor NASA Science Editorial Team Related Terms
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6 min read
Quantum Scale Sensors used to Measure Planetary Scale Magnetic Fields
Magnetic fields are everywhere in our solar system. They originate from the Sun, planets, and moons, and are carried throughout interplanetary space by solar wind. This is precisely why magnetometers—devices used to measure magnetic fields—are flown on almost all missions in space to benefit the Earth, Planetary, and Heliophysics science communities, and ultimately enrich knowledge for all humankind. These instruments can remotely probe the interior of a planetary body to provide insight into its internal composition, structure, dynamics, and even evolution based on the magnetic history frozen into the body’s crustal rock layers. Magnetometers can even discover hidden oceans within our solar system and help determine their salinity, thereby providing insight into the potential habitability of these icy worlds.
Left: The magnetic field of Jupiter provides insight into its interior composition, structure, dynamics, and even its evolutionary history. Right: Image of the first prototype 4H-SiC solid-state magnetometer sensor die (2mm by 2mm) developed by NASA-GRC. Each gold rectangle or square on the surface represents an individual sensor, the smallest being 10 microns by 10 microns. Fluxgates are the most widely used magnetometers for missions in space due to their proven performance and simplicity. However, the conventional size, weight, and power (SWaP) of fluxgate instruments can restrict them from being used on small platforms like CubeSats and sometimes limit the number of sensors that can be used on a spacecraft for inter-sensor calibration, redundancy, and spacecraft magnetic field removal. Traditionally, a long boom is used to distance the fluxgate magnetometers from the contaminate magnetic field generated by the spacecraft, itself, and at least two sensors are used to characterize the falloff of this field contribution so it can be removed from the measurements. Fluxgates also do not provide an absolute measurement, meaning that they need to be routinely calibrated in space through spacecraft rolls, which can be time and resource intensive.
An SMD-funded team at NASA’s Jet Propulsion Laboratory in Southern California has partnered with NASA’s Glenn Research Center in Cleveland, Ohio to prototype a new magnetometer called the silicon carbide (SiC) magnetometer, or SiCMag, that could change the way magnetic fields are measured in space. SiCMag uses a solid-state sensor made of a silicon carbide (SiC) semiconductor. Inside the SiC sensor are quantum centers—intentionally introduced defects or irregularities at an atomic scale—that give rise to a magnetoresistance signal that can be detected by monitoring changes in the sensor’s electrical current, which indicate changes in the strength and direction of the external magnetic field. This new technology has the potential to be incredibly sensitive, and due to its large bandgap (i.e., the energy required to free an electron from its bound state so it can participate in electrical conduction), is capable of operating in the wide range of temperature extremes and harsh radiation environments commonly encountered in space.
Team member David Spry of NASA Glenn indicates, “Not only is the SiC material great for magnetic field sensing, but here at NASA Glenn we’re further developing robust SiC electronics that operate in hot environments far beyond the upper temperature limitations of silicon electronics. These SiC-based technologies will someday enable long-duration robotic scientific exploration of the 460 °C Venus surface.”
SiCMag is also very small— the sensor area is only 0.1 x 0.1 mm and the compensation coils are smaller than a penny. Consequently, dozens of SiCMag sensors can easily be incorporated on a spacecraft to better remove the complex contaminate magnetic field generated by the spacecraft, reducing the need for a long boom to distance the sensors from the spacecraft, like implemented on most spacecraft, including Psyche (see figure below).
The magnetic field lines associated with the Psyche spacecraft, modeled from over 200 individual magnetic sources. Removing this magnetic field contribution from the measurements conventionally requires the use of two fluxgate sensors on a long boom. Incorporating 4 or more SiCMag sensors in such a scenario would significantly reduce the size of the boom required, or even remove the need for a boom completely. Image Credit: This image was adopted from https://science.nasa.gov/resource/magnetic-field-of-the-psyche-spacecraft/ SiCMag has several advantages when compared to fluxgates and other types of heritage magnetometers including those based on optically pumped atomic vapor. SiCMag is a simple instrument that doesn’t rely on optics or high-frequency components, which are sensitive to temperature variations. SiCMag’s low SWaP also allows for accommodation on small platforms such as CubeSats, enabling simultaneous spatial and temporal magnetic field measurements not possible with single large-scale spacecraft. This capability will enable planetary magnetic field mapping and space weather monitoring by constellations of CubeSats. Multiplatform measurements would also be very valuable on the surface of the Moon and Mars for crustal magnetic field mapping, composition identification, and magnetic history investigation of these bodies.
SiCMag has a true zero-field magnetic sensing ability (i.e., SiCMag can measure extremely weak magnetic fields), which is unattainable with most conventional atomic vapor magnetometers due to the requisite minimum magnetic field needed for the sensor to operate. And because the spin-carrying electrons in SiCMag are tied up in the quantum centers, they won’t escape the sensor, meaning they are well-suited for decades-long journeys to the ice-giants or to the edges of the heliosphere. This capability is also an advantage of SiCMag’s optical equivalent sibling, OPuS-MAGNM, an optically pumped solid state quantum magnetometer developed by Hannes Kraus and matured by Andreas Gottscholl of the JPL solid-state magnetometry group. SiCMag has the advantage of being extremely simple, while OPuS-MAGNM promises to have lower noise characteristics, but uses complex optical components.
According to Dr. Andreas Gottscholl, “SiCMag and OPuS-MAGNM are very similar, actually. Progress in one sensor system translates directly into benefits for the other. Therefore, enhancements in design and electronics advance both projects, effectively doubling the impact of our efforts while we are still flexible for different applications.”
SiCMag has the ability to self-calibrate due to its absolute sensing capability, which is a significant advantage in the remote space environment. SiCMag uses a spectroscopic calibration technique that atomic vapor magnetometers also leverage called magnetic resonance (in the case of SiCMag, the magnetic resonance is electrically detected) to measure the precession frequency of electrons associated with the quantum centers, which is directly related to the magnetic field in which the sensor is immersed. This relationship is a fundamental physical constant in nature that doesn’t change as a function of time or temperature, making the response ideal for calibration of the sensor’s measurements. “If we are successful in achieving the sought-out sensitivity improvement we anticipate using isotopically purer materials, SiC could change the way magnetometry is typically performed in space due to the instrument’s attractive SWaP, robustness, and self-calibration ability,” says JPL’s Dr. Corey Cochrane, principal investigator of the SiCMag technology.
The 3-axis 3D printed electromagnet – no larger than the size of a US penny – is used to modulate and maintain a region of zero magnetic field around our 0.1 mm x 0.1 mm 4H-SiC solid-state sensor. NASA has been funding this team’s solid-state quantum magnetometer sensor research through its PICASSO (Planetary Instrument Concepts for the Advancement of Solar System Observations) program since 2016. A variety of domestic partners from industry and academia also support this research, including NASA’s Glenn Research Center in Cleveland, Penn State University, University of Iowa, QuantCAD LLC, as well as international partners such as Japan’s Quantum Materials and Applications Research Center (QUARC) and Infineon Technologies.
The SiC magnetometer team leads from JPL and GRC (left: Dr. Hannes Kraus, middle: Dr. Phillip Neudeck, right: Dr. Corey Cochrane) at the last International Conference on Silicon Carbide and Related Materials (ICSCRM) where their research is presented annually. Acknowledgment: The research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration (80NM0018D0004) and the NASA Glenn Research Center.
Project Lead(s):
Dr. Corey Cochrane, Dr. Hannes Kraus, Jet Propulsion Laboratory/California Institute of Technology
Dr. Phil Neudeck, David Spry, NASA Glenn Research Center
Sponsoring Organization(s):
Science Mission Directorate PICASSO, JPL R&D fund
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Last Updated Aug 06, 2024 Related Terms
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5 Min Read ‘Current’ Events: NASA and USGS Find a New Way to Measure River Flows
The River Observing System (RiOS) tracking the motion of water surface features from above a section of the Sacramento River in Northern California in 2023. Credits: NASA/USGS/Joe Adams and Chris Gazoorian A team of scientists and engineers at NASA and the U.S. Geological Survey (USGS) collaborated to see if a small piloted drone, equipped with a specialized payload, could help create detailed maps of how fast water is flowing. Rivers supply fresh water to our communities and farms, provide homes for a variety of creatures, transport people and goods, and generate electricity. But river flows can also carry pollutants downstream or suddenly surge, posing dangers to people, wildlife, and property. As NASA continues its ongoing commitment to better understand our home planet, researchers are working to answer the question of how do we stay in-the-know about where and how quickly river flows change?
NASA and USGS scientists have teamed up to create an instrument package – about the size of a gallon of milk – called the River Observing System (RiOS). It features thermal and visible cameras for tracking the motion of water surface features, a laser to measure altitude, navigation sensors, an onboard computer, and a wireless communications system. In 2023, researchers took RiOS into the field for testing along a section of the Sacramento River in Northern California, and plan to return for a third and final field test in the fall of 2024.
The River Observing System (RiOS) tracking the motion of water surface features from above a section of the Sacramento River in Northern California in 2023. “Deploying RiOS above a river to evaluate the system’s performance in a real-world setting is incredibly important,” said Carl Legleiter, USGS principal investigator of the joint NASA-USGS StreamFlow project. “During these test flights we demonstrated that the onboard payload can be used to make calculations – do the analysis – in nearly real-time, while the drone is flying above the river. This was one of our top-tier goals: to enable minimal latency between the time we acquire images and when we have detailed information on current speeds and flow patterns within the river.”
To realize this vision for onboard computing, the team uses open-source software, combined with their own code, to produce maps of water surface velocities, or flow field, from a series of images taken over time.
“You might think that we need to be able to see discrete, physical objects – like sticks or silt or other debris as they move downstream – to estimate the flow velocity, but that’s not always the case, nor is it always possible,” said Legleiter. “Using a highly-sensitive infrared camera, we instead detect the movement of subtle differences in the temperature of water carried downstream.”
Those same tiny temperature differences also appear wherever there are undulations – like at the boundary between the air and the water or ice below. Knowing this, NASA members of the StreamFlow team used this phenomenon to their advantage when developing methods for possible future landed planetary missions to navigate at distant and hard-to-see environments, including Europa, the icy moon orbiting Jupiter.
Our technology can precisely track the static surface of icy terrain while flying over it, or a moving surface, like water, while hovering above it to keep the spacecraft safe while gathering valuable data
uland wong
Co-investigator and NASA lead of the StreamFlow Project
“Icy surfaces present challenging visual conditions such as lack of contrast,” said Uland Wong, co-investigator and NASA lead of the StreamFlow project at NASA’s Ames Research Center in California’s Silicon Valley. “Our technology can precisely track the static surface of icy terrain while flying over it, or a moving surface, like water, while hovering above it to keep the spacecraft safe while gathering valuable data.”
To prepare for the Sacramento River field tests, the NASA team built a robotics simulator to run thousands of virtual drone flights over the Sacramento River test site using flow fields modeled by USGS. These simulations are helping the team create intelligent software capable of selecting the best routes for the drone to fly and ensuring efficient use of limited battery power.
The next step in the partnership is for NASA to develop techniques for making the system more autonomous. The researchers want to use calculations of river flows – performed onboard in real time – to guide where the drone should fly next.
“Does the drone drop down to get better resolution data about a particular location or stay high and capture a wide-angle view,” posed Wong. “If it identifies areas that are flowing particularly fast or slow, could the drone more quickly detect areas of flooding?”
The USGS currently operates an extensive network of thousands of automated stream gauges and fixed cameras installed on bridges and riverbanks to monitor river flows in real-time across the country.
“Drones could enable us to make measurements in so many more areas, potentially allowing our network to be larger, more robust, and safer for our technicians to monitor and maintain,” said Paul Kinzel, StreamFlow co-investigator at USGS. “Drones could help keep our people and equipment out of harm’s way in addition to telling us how the environment is changing over time in as many locations as possible.”
A drone with the StreamFlow thermal mapping payload flying above the Sacramento River in Northern California.NASA/Massimo Vespignani For more information about how NASA improves life on Earth through climate and technological innovations, visit:
http://www.nasa.gov/earth
The StreamFlow project is a collaboration between researchers with the USGS’s Hydrologic Remote Sensing Branch, Unmanned Aircraft Systems engineers with the USGS National Innovation Center, and scientists in the Intelligent Robotics Group at NASA Ames. The Streamflow payload concept was demonstrated through research initially seeded by a grant from the USGS National Innovation Center and is now supported by NASA’s Advanced Information Systems Technology program, which is managed by the agency’s Earth Science Technology Office. The field tests were conducted in collaboration with the National Oceanographic and Atmospheric Administration (NOAA) Southwest Fisheries Science Center, which helped collect direct field measurements of the river’s flow velocity and granted access to the field site, which is owned by the Nature Conservancy.
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Last Updated Aug 05, 2024 Related Terms
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