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NASA Technicians do final checks on NASA’s Spirit rover in this image from March 28, 2003. The rover – and its twin, Opportunity – studied the history of climate and water at sites on Mars where conditions may once have been favorable to life. Each rover is about the size of a golf cart and seven times heavier (about 405 pounds or 185 kilograms) than the Sojourner rover launched on the Mars Pathfinder to Mars mission in 1996.
Spirit and Opportunity were sent to opposite sides of Mars to locations that were suspected of having been affected by liquid water in the past. Spirit was launched first, on June 10, 2003. Spirit landed on the Martian surface on Jan. 3, 2004, about 8 miles (13.4 kilometers) from the planned target and inside the Gusev crater. The site became known as Columbia Memorial Station to honor the seven astronauts killed when the space shuttle Columbia broke apart Feb. 1, 2003, as it returned to Earth. The plaque commemorating the STS-107 Space Shuttle Columbia crew can be seen in the image above.
Spirit operated for 6 years, 2 months, and 19 days, more than 25 times its original intended lifetime, traveling 4.8 miles (7.73 kilometers) across the Martian plains.
Image credit: NASA
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Atomic Layer Processing Coating Techniques Enable Missions to See Further into the Ultraviolet
Astrophysics observations at ultraviolet (UV) wavelengths often probe the most dynamic aspects of the universe. However, the high energy of ultraviolet photons means that their interaction with the materials that make up an observing instrument are less efficient, resulting in low overall throughput. New approaches in the development of thin film coatings are addressing this shortcoming by engineering the coatings of instrument structures at the atomic scale.
Researchers at the NASA Jet Propulsion Laboratory (JPL) are employing atomic layer deposition (ALD) and atomic layer etching (ALE) to enable new coating technologies for instruments measuring ultraviolet light. Conventional optical coatings largely rely on physical vapor deposition (PVD) methods like evaporation, where the coating layer is formed by vaporizing the source material and then condensing it onto the intended substrate. In contrast, ALD and ALE rely on a cyclic series of self-limiting chemical reactions that result in the deposition (or removal) of material one atomic layer at a time. This self-limiting characteristic results in a coating or etchings that are conformal over arbitrary shapes with precisely controlled layer thickness determined by the number of ALD or ALE cycles performed.
The ALD and ALE techniques are common in the semiconductor industry where they are used to fabricate high-performance transistors. Their use as an optical coating method is less common, particularly at ultraviolet wavelengths where the choice of optical coating material is largely restricted to metal fluorides instead of more common metal oxides, due to the larger optical band energy of fluoride materials, which minimizes absorption losses in the coatings. Using an approach based on co-reaction with hydrogen fluoride, the team at JPL has developed a variety of fluoride-based ALD and ALE processes.
(left) The Supernova remnants and Proxies for ReIonization Testbed Experiment (SPRITE) CubeSat primary mirror inside the ALD coating facility at JPL, the mirror is 18 cm on the long and is the largest optic coated in this chamber to-date. (right) Flight optic coating inside JPL ALD chamber for Pioneers Aspera Mission. Like SPRITE, the Aspera coating combines a lithium fluoride process developed at NASA GSFC with thin ALD encapsulation of magnesium fluoride at JPL. Image Credit: NASA-JPL In addition to these metal-fluoride materials, layers of aluminum are often used to construct structures like reflective mirrors and bandpass filters for instruments operating in the UV. Although aluminum has high intrinsic UV reflectance, it also readily forms a surface oxide that strongly absorbs UV light. The role of the metal fluoride coating is then to protect the aluminum surface from oxidation while maintaining enough transparency to create a mirror with high reflectance.
The use of ALD in this context has initially been pursued in the development of telescope optics for two SmallSat astrophysics missions that will operate in the UV: the Supernova remnants and Proxies for ReIonization Testbed Experiment (SPRITE) CubeSat mission led by Brian Fleming at the University of Colorado Boulder, and the Aspera mission led by Carlos Vargas at the University of Arizona. The mirrors for SPRITE and Aspera have reflective coatings that utilize aluminum protected by lithium fluoride using a novel PVD processes developed at NASA Goddard Space Flight Center, and an additional very thin top coating of magnesium fluoride deposited via ALD.
Team member John Hennessy prepares to load a sample wafer in the ALD coating chamber at JPL. Image Credit: NASA JPL The use of lithium fluoride enables SPRITE and Aspera to “see” further into the UV than other missions like NASA’s Hubble Space Telescope, which uses only magnesium fluoride to protect its aluminum mirror surfaces. However, a drawback of lithium fluoride is its sensitivity to moisture, which in some cases can cause the performance of these mirror coatings to degrade on the ground prior to launch. To circumvent this issue, very thin layers (~1.5 nanometers) of magnesium fluoride were deposited by ALD on top of the lithium fluoride on the SPRITE and Aspera mirrors. The magnesium fluoride layers are thin enough to not strongly impact the performance of the mirror at the shortest wavelengths, but thick enough to enhance the stability against humidity during ground phases of the missions. Similar approaches are being considered for the mirror coatings of the future NASA flagship Habitable Worlds Observatory (HWO).
Multilayer structures of aluminum and metal fluorides can also function as bandpass filters (filters that allow only signals within a selected range of wavelengths to pass through to be recorded) in the UV. Here, ALD is an attractive option due to the inherent repeatability and precise thickness control of the process. There is currently no suitable ALD process to deposit aluminum, and so additional work by the JPL team has explored the development of a custom vacuum coating chamber that combines the PVD aluminum and ALD fluoride processes described above. This system has been used to develop UV bandpass filters that can be deposited directly onto imaging sensors like silicon (Si) CCDs. These coatings can enable such sensors to operate with high UV efficiency, but low sensitivity to longer wavelength visible photons that would otherwise add background noise to the UV observations.
Structures composed of multilayer aluminum and metal fluoride coatings have recently been delivered as part of a UV camera to the Star-Planet Activity Research CubeSat (SPARCS) mission led by Evgenya Shkolnik at Arizona State University. The JPL-developed camera incorporates a delta-doped Si CCD with the ALD/PVD filter coating on the far ultraviolet channel, yielding a sensor with high efficiency in a band centered near 160 nm with low response to out-of-band light.
A prototype of a back-illuminated CCD incorporating a multi-layer metal-dielectric bandpass filter coating deposited by a combination of thermal evaporation and ALD. This coating combined with JPL back surface passivation approaches enable the Si CCD to operate with high UV efficiency while rejecting longer wavelength light. Image credit: NASA JPL Next, the JPL team that developed these coating processes plans to focus on implementing a similar bandpass filter on an array of larger-format Si Complementary Metal-Oxide-Semiconductor (CMOS) sensors for the recently selected NASA Medium-Class Explorer (MIDEX) UltraViolet EXplorer (UVEX) mission led by Fiona Harrison at the California Institute of Technology, which is targeted to launch in the early 2030s.
For additional details, see the entry for this project on NASA TechPort
Project Lead: Dr. John Hennessy, Jet Propulsion Laboratory (JPL)
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Students, mentors, and team supporters donning team colors watch robots clash on the playing field at the FIRST Robotics Los Angeles regional competition in El Segundo on March 16. NASA/JPL-Caltech Robots built by high schoolers vied for points in a fast-moving game inspired by complex ocean ecosystems at the FIRST Robotics Los Angeles regional competition.
High school students who spent weeks designing, assembling, and testing 125-pound rolling robots put their fast-moving creations into the ring over the weekend, facing off at the annual Los Angeles regional FIRST Robotics Competition, an event supported by NASA’s Jet Propulsion Laboratory in Southern California.
Four of the 43 participating teams earned a chance to compete in April at the FIRST international championship tournament in Houston, which draws winning teams from across the country.
Held March 14 to 16 at the Da Vinci Schools campus in El Segundo, the event is one of many supported by the nonprofit FIRST (For Inspiration and Recognition of Science and Technology), which pairs students with STEM professionals. Teams receive the game rules, which change every year, in January and sprint toward competition, assembling their robot based on FIRST’s specifications. The global competition not only gives students engineering experience but also helps them develop business skills with a range of activities, from fundraising for their team to marketing.
For this year’s game, called “Reefscape,” two alliances of three teams competed for points during each 2½-minute match. That meant six robots at a time sped across the floor, knocking into each other and angling to seed “coral” (pieces of PVC pipe) on “reefs” and harvesting “algae” (rubber balls). In the final seconds of each round, teams could earn extra points if their robots were able to hoist themselves into the air and dangle from hanging cages, as though they were ascending to the ocean surface.
The action was set to a bouncy soundtrack that reverberated through the gym, while in the bleachers there were choreographed dancing, loud cheers, pom-poms, and even some tears.
The winning alliance was composed of Warbots from Downey’s Warren High School, TorBots from Torrance’s South High School, and West Torrance Robotics from Torrance’s West High School. The Robo-Nerds of Benjamin Franklin High in Los Angeles’ Highland Park and Robo’Lyon from Notre Dame de Bellegarde outside Lyon, France, won awards that mean they’ll also get to compete in Houston, alongside the Warbots and the TorBots.
NASA and its Robotics Alliance Project provide grants for high school teams across the country and support FIRST Robotics competitions to encourage students to pursue STEM careers in aerospace. For the L.A. regional competition, JPL has coordinated volunteers — and provided coaching and mentoring to teams, judges, and other competition support — for 25 years.
For more information about the FIRST Los Angeles regional, visit:
https://cafirst.org/frc/losangeles/
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Melissa Pamer
Jet Propulsion Laboratory, Pasadena, Calif.
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NASA’s Record-Shattering, Theory-Breaking MMS Mission Turns 10
Since its launch on March 12, 2015, NASA’s MMS, or Magnetospheric Multiscale, mission has been rewriting our understanding of a key physical process that is important across the universe, from black holes to the Sun to Earth’s protective magnetic field.
This process, called magnetic reconnection, occurs when magnetic field lines tangle and explosively realign, flinging away nearby particles. Around Earth, a single magnetic reconnection event can release as much energy in a couple of hours as the entire United States uses in a day.
Over the past 10 years, thousands of research papers with discoveries by MMS have enabled a wide range of technical and scientific advances, such as those about the conditions on the Sun that create space weather, which can impact technology and communications at Earth. It has also enabled insights for fusion energy technologies.
“The MMS mission has been a very important asset in NASA’s heliophysics fleet observatory,” said Guan Le, MMS mission lead at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “It has utterly changed how we understand magnetic reconnection.”
An infographic noting the accomplishments of NASA’s Magnetospheric Multiscale mission after 10 years in space. NASA’s Goddard Space Flight Center/Kristen Perrin Studying magnetic reconnection is key to understanding where this energy goes and how it can affect us down on the ground.
“The MMS mission not only studies universal physical processes, but it also allows us to probe the mechanisms that connect big eruptions on the Sun to things we experience on Earth, such as auroras, geomagnetic storms, and even power outages in extreme cases,” said Kevin Genestreti, MMS science deputy principal investigator and lead scientist at Southwest Research Institute’s Space Sector in Durham, New Hampshire.
The Perfect Laboratory
Using four identical spacecraft, MMS studies magnetic reconnection while traveling in a long, oval-shaped orbit around Earth — a perfect laboratory for closely studying magnetic reconnection.
“You can measure reconnection in a laboratory, but the scales are so very small there that you can’t make the detailed measurements needed to really understand reconnection,” said Jim Burch, principal investigator for MMS at the Southwest Research Institute in San Antonio, Texas.
Magnetic reconnection primarily happens in two locations around Earth, one located on the side facing the Sun, and another behind Earth farther away from the Sun. In their orbit, the four MMS spacecraft repeatedly pass through these key locations.
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This artist’s concept shows magnetic reconnection at Earth during a solar storm. NASA Goddard’s Conceptual Image Lab/Krystofer Kim Before MMS, scientists only had a limited understanding of magnetic reconnection. But by improving instrument measurement speeds tenfold, MMS has been able to dramatically reshape what we know about the process. To date, MMS data has led to over 1,500 published scientific articles.
“For example, it turned out that the basic theory of reconnection in turbulent regions was wrong because previous missions couldn’t make observations at the level MMS can,” Burch said. “We also found reconnection in a lot of places that weren’t predicted.”
Working out new and refined theories of magnetic reconnection was an integral part of the MMS mission from the outset.
“One of the truly groundbreaking findings from MMS is that the heart of reconnection has a well-ordered beat – even if everything around is turbulent,” said Michael Hesse, MMS theory and modeling lead at NASA’s Ames Research Center in California’s Silicon Valley. “This shows that precision measurement can decide between competing theories.”
Enabling Breakthroughs for Science and Scientists
The mission’s successes have also been a boon to young scientists, who are closely involved with the mission at all levels.
“In addition to its scientific achievements, it has also helped almost 50 students get doctorate degrees and enabled early career scientists to grow into leadership positions,” Le said.
To foster young scientists, MMS provides early career research grants to team members. The MMS team also created “Leads In-Training” roles to bring early career scientists to the table for big mission decisions and provide them the experience they need to move into leadership positions. The program has been so successful it is now required for all NASA Heliophysics missions.
Breaking Records
Beyond its scientific achievements, MMS also holds several records. Only months after launch, MMS received its first Guinness World Record for highest GPS fix at 44,000 miles above Earth. It would later shatter this record as it moved into a longer orbit, taking it 116,300 miles — halfway to the Moon — away from GPS transponders at Earth. GPS is designed to send signals down toward Earth, so using it in space, where signals are weak, is challenging. By using GPS at high altitudes, MMS has shown its potential for other applications.
“This GPS demonstration has been of great interest for the developers of the Artemis missions, which is testing GPS at lunar distances,” said Jim Clapsadle, MMS mission director at NASA Goddard.
The mission also holds the Guinness World Record for smallest satellite formation, with just 2.6 miles between spacecraft. Over the years, MMS’ four spacecraft have flown in lines and pyramid-shaped formations from 5 to 100 miles across to help scientists study magnetic reconnection on a range of scales. In that time, the spacecraft’s health has remained remarkably well.
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This artist’s concept beauty pass shows the MMS spacecraft flying on Earth’s nightside, where MMS continues to study magnetic reconnection. NASA’s Goddard Space Flight Center Conceptual Image Lab “The hardware has proved very reliable, even now, 10 years into flight,” said Trevor Williams, MMS flight dynamics lead at NASA Goddard.
After launch, Williams and the flight operations team came up with more fuel-efficient ways to maneuver the spacecraft and keep them at their designated separations. As a result, the mission still has about a fourth of the fuel it launched with. This economy leaves enough fuel to continue operating the mission for decades. That’s good news to mission scientists who are eager to continue studying magnetic reconnection with MMS.
“We have thousands of magnetic reconnection events on the day side, but far fewer on the nightside,” Burch said. “But over the next three years we’ll be in a prime location to finish investigating nightside reconnection.”
By Mara Johnson-Groh
NASA’s Goddard Space Flight Center, Greenbelt, Md.
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Explore This Section Webb News Latest News Latest Images Blog (offsite) Awards X (offsite – login reqd) Instagram (offsite – login reqd) Facebook (offsite- login reqd) Youtube (offsite) Overview About Who is James Webb? Fact Sheet Impacts+Benefits FAQ Science Overview and Goals Early Universe Galaxies Over Time Star Lifecycle Other Worlds Observatory Overview Launch Orbit Mirrors Sunshield Instrument: NIRCam Instrument: MIRI Instrument: NIRSpec Instrument: FGS/NIRISS Optical Telescope Element Backplane Spacecraft Bus Instrument Module Multimedia About Webb Images Images Videos What is Webb Observing? 3d Webb in 3d Solar System Podcasts Webb Image Sonifications Team International Team People Of Webb More For the Media For Scientists For Educators For Fun/Learning 6 Min Read NASA’s Webb Peers Deeper into Mysterious Flame Nebula
This collage of images from the Flame Nebula shows a near-infrared light view from NASA’s Hubble Space Telescope on the left, while the two insets at the right show the near-infrared view taken by NASA’s James Webb Space Telescope. Credits:
NASA, ESA, CSA, M. Meyer (University of Michigan), A. Pagan (STScI) The Flame Nebula, located about 1,400 light-years away from Earth, is a hotbed of star formation less than 1 million years old. Within the Flame Nebula, there are objects so small that their cores will never be able to fuse hydrogen like full-fledged stars—brown dwarfs.
Brown dwarfs, often called “failed stars,” over time become very dim and much cooler than stars. These factors make observing brown dwarfs with most telescopes difficult, if not impossible, even at cosmically short distances from the Sun. When they are very young, however, they are still relatively warmer and brighter and therefore easier to observe despite the obscuring, dense dust and gas that comprises the Flame Nebula in this case.
NASA’s James Webb Space Telescope can pierce this dense, dusty region and see the faint infrared glow from young brown dwarfs. A team of astronomers used this capability to explore the lowest mass limit of brown dwarfs within the Flame Nebula. The result, they found, were free-floating objects roughly two to three times the mass of Jupiter, although they were sensitive down to 0.5 times the mass of Jupiter.
“The goal of this project was to explore the fundamental low-mass limit of the star and brown dwarf formation process. With Webb, we’re able to probe the faintest and lowest mass objects,” said lead study author Matthew De Furio of the University of Texas at Austin.
Image A: Flame Nebula: Hubble and Webb Observations
This collage of images from the Flame Nebula shows a near-infrared light view from NASA’s Hubble Space Telescope on the left, while the two insets at the right show the near-infrared view taken by NASA’s James Webb Space Telescope. Much of the dark, dense gas and dust, as well as the surrounding white clouds within the Hubble image, have been cleared in the Webb images, giving us a view into a more translucent cloud pierced by the infrared-producing objects within that are young stars and brown dwarfs. Astronomers used Webb to take a census of the lowest-mass objects within this star-forming region.
The Hubble image on the left represents light at wavelengths of 1.05 microns (filter F105W) as blue, 1.3 microns (F130N) as green, and 1.39 microns (F129M) as red. The two Webb images on the right represent light at wavelengths of 1.15 microns and 1.4 microns (filters F115W and F140M) as blue, 1.82 microns (F182M) as green, 3.6 microns (F360M) as orange, and 4.3 microns (F430M) as red. NASA, ESA, CSA, M. Meyer (University of Michigan), A. Pagan (STScI) Smaller Fragments
The low-mass limit the team sought is set by a process called fragmentation. In this process large molecular clouds, from which both stars and brown dwarfs are born, break apart into smaller and smaller units, or fragments.
Fragmentation is highly dependent on several factors with the balance between temperature, thermal pressure, and gravity being among the most important. More specifically, as fragments contract under the force of gravity, their cores heat up. If a core is massive enough, it will begin to fuse hydrogen. The outward pressure created by that fusion counteracts gravity, stopping collapse and stabilizing the object (then known as a star). However, fragments whose cores are not compact and hot enough to burn hydrogen continue to contract as long as they radiate away their internal heat.
“The cooling of these clouds is important because if you have enough internal energy, it will fight that gravity,” says Michael Meyer of the University of Michigan. “If the clouds cool efficiently, they collapse and break apart.”
Fragmentation stops when a fragment becomes opaque enough to reabsorb its own radiation, thereby stopping the cooling and preventing further collapse. Theories placed the lower limit of these fragments anywhere between one and ten Jupiter masses. This study significantly shrinks that range as Webb’s census counted up fragments of different masses within the nebula.
“As found in many previous studies, as you go to lower masses, you actually get more objects up to about ten times the mass of Jupiter. In our study with the James Webb Space Telescope, we are sensitive down to 0.5 times the mass of Jupiter, and we are finding significantly fewer and fewer things as you go below ten times the mass of Jupiter,” De Furio explained. “We find fewer five-Jupiter-mass objects than ten-Jupiter-mass objects, and we find way fewer three-Jupiter-mass objects than five-Jupiter-mass objects. We don’t really find any objects below two or three Jupiter masses, and we expect to see them if they are there, so we are hypothesizing that this could be the limit itself.”
Meyer added, “Webb, for the first time, has been able to probe up to and beyond that limit. If that limit is real, there really shouldn’t be any one-Jupiter-mass objects free-floating out in our Milky Way galaxy, unless they were formed as planets and then ejected out of a planetary system.”
Image B: Low Mass Objects within the Flame Nebula in Infrared Light
This near-infrared image of a portion of the Flame Nebula from NASA’s James Webb Space Telescope highlights three low-mass objects, seen in the insets to the right. These objects, which are much colder than protostars, require the sensitivity of Webb’s instruments to detect them. These objects were studied as part of an effort to explore the lowest mass limit of brown dwarfs within the Flame Nebula.
The Webb images represent light at wavelengths of 1.15 microns and 1.4 microns (filters F115W and F140M) as blue, 1.82 microns (F182M) as green, 3.6 microns (F360M) as orange, and 4.3 microns (F430M) as red. NASA, ESA, CSA, STScI, M. Meyer (University of Michigan) Building on Hubble’s Legacy
Brown dwarfs, given the difficulty of finding them, have a wealth of information to provide, particularly in star formation and planetary research given their similarities to both stars and planets. NASA’s Hubble Space Telescope has been on the hunt for these brown dwarfs for decades.
Even though Hubble can’t observe the brown dwarfs in the Flame Nebula to as low a mass as Webb can, it was crucial in identifying candidates for further study. This study is an example of how Webb took the baton—decades of Hubble data from the Orion Molecular Cloud Complex—and enabled in-depth research.
“It’s really difficult to do this work, looking at brown dwarfs down to even ten Jupiter masses, from the ground, especially in regions like this. And having existing Hubble data over the last 30 years or so allowed us to know that this is a really useful star-forming region to target. We needed to have Webb to be able to study this particular science topic,” said De Furio.
“It’s a quantum leap in our capabilities between understanding what was going on from Hubble. Webb is really opening an entirely new realm of possibilities, understanding these objects,” explained astronomer Massimo Robberto of the Space Telescope Science Institute.
This team is continuing to study the Flame Nebula, using Webb’s spectroscopic tools to further characterize the different objects within its dusty cocoon.
“There’s a big overlap between the things that could be planets and the things that are very, very low mass brown dwarfs,” Meyer stated. “And that’s our job in the next five years: to figure out which is which and why.”
These results are accepted for publication in The Astrophysical Journal Letters.
Image C (Animated): Flame Nebula (Hubble and Webb Comparison)
This animated image alternates between a Hubble Space Telescope and a James Webb Space Telescope observation of the Flame Nebula, a nearby star-forming nebula less than 1 million years old. In this comparison, three low-mass objects are highlighted. In Hubble’s observation, the low-mass objects are hidden by the region’s dense dust and gas. However, the objects are brought out in the Webb observation due to Webb’s sensitivity to faint infrared light. NASA, ESA, CSA, Alyssa Pagan (STScI) 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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Laura Betz – laura.e.betz@nasa.gov
NASA’s Goddard Space Flight Center, Greenbelt, Md.
Matthew Brown – mabrown@stsci.edu
Space Telescope Science Institute, Baltimore, Md.
Christine Pulliam – cpulliam@stsci.edu
Space Telescope Science Institute, Baltimore, Md.
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