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Digging Deeper to Find Life on Ocean Worlds
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By NASA
A NASA-developed material made of carbon nanotubes will enable our search for exoplanets—some of which might be capable of supporting life. Originally developed in 2007 by a team of researchers led by Innovators of the Year John Hagopian and Stephanie Getty at NASA’s Goddard Space Flight Center, this carbon nanotube technology is being refined for potential use on NASA’s upcoming Habitable Worlds Observatory (HWO)—the first telescope designed specifically to search for signs of life on planets orbiting other stars.
As shown in the figure below, carbon nanotubes look like graphene (a single layer of carbon atoms arranged in a hexagonal lattice) that is rolled into a tube. The super-dark material consists of multiwalled carbon nanotubes (i.e., nested nanotubes) that grow vertically into a “forest.” The carbon nanotubes are 99% empty space so the light entering the material doesn’t get reflected. Instead, the light enters the nanotube forest and jiggles electrons in the hexagonal lattice of carbon atoms, converting the light to heat. The ability of the carbon nanotubes to eliminate almost all light is enabling for NASA’s scientific instruments because stray light limits how sensitive the observations can be. When applied to instrument structures, this material can eliminate much of the stray light and enable new and better observations.
Left: Artist’s conception of graphene, single and multiwalled carbon nanotube structures. Right: Scanning electron microscope image of vertically aligned multiwalled carbon nanotube forest with a section removed in the center. Credit: Delft University/Dr. Sten Vollebregt and NASA GSFC Viewing exoplanets is incredibly difficult; the exoplanets revolve around stars that are 10 billion times brighter than they are. It’s like looking at the Sun and trying to see a dim star next to it in the daytime. Specialized instruments called coronagraphs must be used to block the light from the star to enable these exoplanets to be viewed. The carbon nanotube material is employed in the coronagraph to block as much stray light as possible from entering the instrument’s detector.
The image below depicts a notional telescope and coronagraph imaging an exoplanet. The telescope collects the light from the distant star and exoplanet. The light is then directed to a coronagraph that collimates the beam, making the light rays parallel, and then the beam is reflected off the apodizer mirror, which is used to precisely control the diffraction of light. Carbon nanotubes on the apodizer mirror absorb the stray light that is diffracted off edges of the telescope structures, so it does not contaminate the observations. The light is then focused on the focal plane mask, which blocks the light from the star but allows light from the exoplanet to pass. The light gets collimated again and is then reflected off a deformable mirror to correct distortion in the image. Finally, the light passes through the Lyot Stop, which is also coated with carbon nanotubes to remove the remaining stray light. The beam is then focused onto the detector array, which forms the image.
Even with all these measures some stray light still reaches the detector, but the coronagraph creates a dark zone where only the light coming from the exoplanet can be seen. The final image on the right in the figure below shows the remaining light from the star in yellow and the light from the exoplanet in red in the dark zone.
Schematic of a notional telescope and coronagraph imaging an exoplanet Credit: Advanced Nanophotonics/John Hagopian, LLC HWO will use a similar scheme to search for habitable exoplanets. Scientists will analyze the spectrum of light captured by HWO to determine the gases in the atmosphere of the exoplanet. The presence of water vapor, oxygen, and perhaps other gases can indicate if an exoplanet could potentially support life.
But how do you make a carbon-nanotube-coated apodizer mirror that could be used on the HWO? Hagopian’s company Advanced Nanophotonics, LLC received Small Business Innovation Research (SBIR) funding to address this challenge.
Carbon nanotubes are grown by depositing catalyst seeds onto a substrate and then placing the substrate into a tube-shaped furnace and heating it to 1382 degrees F, which is red hot! Gases containing carbon are then flowed into the heated tube, and at these temperatures the gases are absorbed by the metal catalyst and transform into a solution, similar to how carbon dioxide in soda water fizzes. The carbon nanotubes literally grow out of the substrate into vertically aligned tubes to form a “forest” wherever the catalyst is located.
Since the growth of carbon nanotubes on the apodizer mirror must occur only in designated areas where stray light is predicted, the catalyst must be applied only to those areas. The four main challenges that had to be overcome to develop this process were: 1) how to pattern the catalyst precisely, 2) how to get a mirror to survive high temperatures without distorting, 3) how to get a coating to survive high temperatures and still be shiny, and 4) how to get the carbon nanotubes to grow on top of a shiny coating. The Advanced Nanophotonics team refined a multi-step process (see figure below) to address these challenges.
Making an Apodizer Mirror for use in a coronagraph Credit: Advanced Nanophotonics/John Hagopian, LLC First a silicon mirror substrate is fabricated to serve as the base for the mirror. This material has properties that allow it to survive very high temperatures and remain flat. These 2-inch mirrors are so flat that if one was scaled to the diameter of Earth, the highest mountain would only be 2.5 inches tall!
Next, the mirror is coated with multiple layers of dielectric and metal, which are deposited by knocking atoms off a target and onto the mirror in a process called sputtering. This coating must be reflective to direct the desired photons, but still be able to survive in the hot environment with corrosive gases that is required to grow carbon nanotubes.
Then a material called resist that is sensitive to light is applied to the mirror and a pattern is created in the resist with a laser. The image on the mirror is chemically developed to remove the resist only in the areas illuminated by the laser, creating a pattern where the mirror’s reflecting surface is exposed only where nanotube growth is desired.
The catalyst is then deposited over the entire mirror surface using sputtering to provide the seeds for carbon nanotube growth. A process called liftoff is used to remove the catalyst and the resist that are located where nanotubes growth is not needed. The mirror is then put in a tube furnace and heated to 1380 degrees Fahrenheit while argon, hydrogen, and ethylene gases are flowed through the tube, which allows the chemical vapor deposition of carbon nanotubes where the catalyst has been patterned. The apodizer mirror is cooled and removed from the tube furnace and characterized to make sure it is still flat, reflective where desired, and very black everywhere else.
The Habitable Worlds Observatory will need a coronagraph with an optimized apodizer mirror to effectively view exoplanets and gather their light for evaluation. To make sure NASA has the best chance to succeed in this search for life, the mirror design and nanotube technology are being refined in test beds across the country.
Under the SBIR program, Advanced Nanophotonics, LLC has delivered apodizers and other coronagraph components to researchers including Remi Soummer at the Space Telescope Science Institute, Eduardo Bendek and Rus Belikov at NASA Ames, Tyler Groff at NASA Goddard, and Arielle Bertrou-Cantou and Dmitri Mawet at the California Institute of Technology. These researchers are testing these components and the results of these studies will inform new designs to eventually enable the goal of a telescope with a contrast ratio of 10 billion to 1.
Reflective Apodizers delivered to Scientists across the country Credit: Advanced Nanophotonics/John Hagopian, LLC In addition, although the desired contrast ratio cannot be achieved using telescopes on Earth, testing apodizer mirror designs on ground-based telescopes not only facilitates technology development, but helps determine the objects HWO might observe. Using funding from the SBIR program, Advanced Nanophotonics also developed transmissive apodizers for the University of Notre Dame to employ on another instrument—the Gemini Planet Imager (GPI) Upgrade. In this case the carbon nanotubes were patterned and grown on glass that transmits the light from the telescope into the coronagraph. The Gemini telescope is an 8.1-meter telescope located in Chile, high atop a mountain in thin air to allow for better viewing. Dr. Jeffrey Chilcote is leading the effort to upgrade the GPI and install the carbon nanotube patterned apodizers and Lyot Stops in the coronagraph to allow viewing of exoplanets starting next year. Discoveries enabled by GPI may also drive future apodizer designs.
More recently, the company was awarded a Phase II SBIR contract to develop next-generation apodizers and other carbon nanotube-based components for the test beds of existing collaborators and new partners at the University of Arizona and the University of California Santa Clara.
Tyler Groff (left) and John Hagopian (right) display a carbon nanotube patterned apodizer mirror used in the NASA Goddard Space Flight Center coronagraph test bed. Credit: Advanced Nanophotonics/John Hagopian, LLC As a result of this SBIR-funded technology effort, Advanced Nanophotonics has collaborated with NASA Scientists to develop a variety of other applications for this nanotube technology.
A special carbon nanotube coating developed by Advanced Nanophotonics was used on the recently launched NASA Ocean Color Instrument onboard the Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission that is observing both the atmosphere and phytoplankton in the ocean, which are key to the health of our planet. A carbon nanotube coating that is only a quarter of the thickness of a human hair was applied around the entrance slit of the instrument. This coating absorbs 99.5% of light in the visible to infrared and prevents stray light from reflecting into the instrument to enable more accurate measurements. Hagopian’s team is also collaborating with the Laser Interferometer Space Antenna (LISA) team to apply the technology to mitigate stray light in the European Space Agency’s space-based gravity wave mission.
They are also working to develop carbon nanotubes for use as electron beam emitters for a project sponsored by the NASA Planetary Instrument Concepts for the Advancement of Solar System Observations (PICASSO) Program. Led by Lucy Lim at NASA Goddard, this project aims to develop an instrument to probe asteroid and comet constituents in space.
In addition, Advanced Nanophotonics worked with researcher Larry Hess at NASA Goddard’s Detector Systems Branch and Jing Li at the NASA Ames Research Center to develop a breathalyzer to screen for Covid-19 using carbon nanotube technology. The electron mobility in a carbon nanotube network enables high sensitivity to gases in exhaled breath that are associated with disease.
This carbon nanotube-based technology is paying dividends both in space, as we continue our search for life, and here on Earth.
For additional details, see the entry for this project on NASA TechPort.
PROJECT LEAD
John Hagopian (Advanced Nanophotonics, LLC)
SPONSORING ORGANIZATION
SMD-funded SBIR project
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Last Updated Sep 03, 2024 Related Terms
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NASA astronaut Steve Swanson harvests a crop of red romaine lettuce plants aboard the International Space Station. Grown from seeds in the Veggie facility, this crop is part of the Veg-01 study to help researchers test and validate the Veggie hardware.NASA NASA Life Sciences Portal (NLSP)
The NASA Life Sciences Portal (NLSP) is the gateway to discovering and accessing all archive data from investigations sponsored by NASA’s Human Research Program (HRP). The HRP conducts research and develops technologies that allow humans to travel safely and productively in space. The Program uses evidence from data collected from astronauts, animals, and plants over many decades, and stored in several repositories accessible via the NLSP, including the Life Sciences Data Archive (LSDA) and Lifetime Surveillance of Astronaut Health and Standard Measures repositories.
Life Sciences Data Archive (LSDA)
NASA’s Life Sciences Data Archive (LSDA) is an archive that provides information and data from 1961 (Mercury Project) through current flight and flight analog studies (International Space Station) involving human, plant and animal subjects.
Much of the information and data are publicly available on this site. Some data are potentially attributable to individual human subjects, and thus restricted by the Privacy Act, but can be requested for research.
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Meet four employees from NASA’s Glenn Research Center who have a personal connection to aviation, at work and beyond.Credit: (Left to right): Waldo Acosta, Jared Berg, Lori Manthey, Lindsay Kaldon The first “A” in NASA stands for aeronautics. Glenn Research Center in Cleveland is just one of several NASA centers conducting revolutionary research to make flight cleaner, safer, and quieter.
But an interest in flying goes beyond the professional for many at NASA. Meet a handful of NASA Glenn employees who have a personal connection to aviation, at work and beyond.
Jared Berg
“I think my flying and engineering work positively influence each other. Flying integrates a lot of technical disciplines and serves as a real-word application of things I know theoretically about aerodynamics or heat transfer.”
jared berg
Thermal Subsystem Manager for Gateway’s Power and Propulsion Element
Left photo: Jared Berg flying above the clouds in the the NASAIRS Flying Club’s Cessna 172. Right photo: A view out the plane window.Credit: Jared Berg Planting the Seed: Berg grew up reading aviation books with his family and building model planes. Attending the EAA AirVenture airshow in Oshkosh, Wisconsin, throughout childhood inspired him to pursue flight training once he had a full-time NASA job.
Joining the Club: Berg is currently a member of the NASAIRS Flying Club at NASA Glenn, which he says helps make flying more accessible and lets him constantly learn from other pilots.
Flying High: Berg has now been flying recreationally for over a decade and considers it a part of his everyday life. “Flying allows an escape from the mundane and brings a sense of adventure to traveling,” Berg said. “You also get to experience nature, specifically weather but also the land you’re flying over, in a way that’s relatively raw and somehow personal.”
Lindsay Kaldon
"I love the feeling after takeoff and when you’ve reached cruising altitude. It’s as if all the stresses of life wash away when you’re up there in the sky. Being up in the clouds with all the beauty of the Earth below, it’s as if you’re in heaven.”
Lindsay Kaldon
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Left photo: Lindsay Kaldon after her first solo flight. Right photo: Kaldon celebrates passing her private pilot exam.Credit: Lindsay Kaldon Air Force and Astronauts: Kaldon’s father was an Air Force F-16 crew chief and a member of the Thunderbirds demonstration team, so Kaldon was no stranger to jets growing up. “Every day was an airshow living on the base that they trained out of,” Kaldon said. After earning a bachelor’s degree in electrical engineering, Kaldon joined the Air Force herself with hopes of one day becoming an astronaut.
Going Solo: Kaldon later earned her private pilot’s license and says she’ll always remember her first solo cross-country flight. She chose Kitty Hawk, the site of the Wright brothers’ first flight, as her destination.
Keeping the Energy: A monument that stands along the runway at Kitty Hawk is inscribed with words Kaldon remembers whenever solving difficult challenges through her work at NASA. “It says, ‘Achieved by Dauntless Resolution and Unconquerable Faith.’ The Wright brothers were faced with a lot of doubters who didn’t think flight was possible. Yet they proved them wrong and never gave up,” Kaldon said. “I love that. When things get tough, I just close my eyes and think about that phrase.”
Lori Manthey
“I encourage anyone who has an interest in flying to take a discovery flight at your local airport. If you get bitten by the flying bug, it just may become a life-long obsession. Ask me how I know!”
Lori Manthey
Chief of Administrative Services and Exchange Operations Manager
Left photo: Lori Manthey with a Grumman Cheetah plane. Right photo: Lori Manthey at the Grumman Cheetah controls.Credit: Lori Manthey Head in the Clouds: After a discovery flight in a small Cessna 150 plane, Manthey was hooked on flying. On weekends and evenings after beginning a full-time NASA job, she hopped in a Piper Tomahawk single-engine trainer at Lorain County Regional Airport to earn her private pilot certificate. “I love the feeling of floating in the air and seeing the world below,” she said.
Women in Aero: Manthey is passionate about advancing and supporting female pilots and currently serves as membership chair of the Lake Erie chapter of the Ninety-Nines, an organization started by Amelia Earhart in 1929. She is also a member of the Cleveland chapter of Women in Aviation.
Looking to the Future: Every year, Manthey participates in Girls in Aviation Day at Cleveland’s Burke Lakefront Airport to introduce girls to the world of aviation. “I think it is so important to help encourage young women and girls to become part of the next generation of female pilots,” she said.
Back in the Cockpit: Manthey is currently working to earn her instrument rating, which will let her fly “blind” in cloudy and foggy weather conditions.
Waldo J. Acosta
“Flying gives me a thrill. The perspective you’re able to see of the world from up in the sky is a special feeling. Aircraft have the ability to take us all over the world so we can experience different cultures and meet different people, and that has shaped me into who I am today.”
Waldo J. Acosta
Icing Research Tunnel Lead Facility Engineer
Left photo: Waldo J. Acosta, right, stands beside his father before taking him for a ride in a DA20 aircraft. Top right photo: A young Acosta and his father at the EAA AirVenture airshow in Oshkosh, Wisconsin. Lower right photo: Acosta (center) works with colleagues Tadas Bartkus (left) and Emily Timko in the control room of NASA Glenn Research Center’s Icing Research Tunnel. Credit: Waldo J. Acosta, NASA/Jef Janis Family Ties: Throughout Acosta’s childhood, Acosta’s father, a former researcher at NASA Glenn, brought his family along on work trips to the EAA AirVenture airshow in Oshkosh, Wisconsin. “I fell in love with everything related to flying during those trips, and they set the tone early on my path to working in aviation,” Acosta said.
Next Steps: Acosta started taking flying lessons while studying aerospace engineering at The Ohio State University, eventually receiving his private pilot’s license.
Safety First: Overseeing testing and maintenance operations at NASA Glenn’s Icing Research Tunnel, Acosta is now directly involved in aviation safety research. The facility, the longest-running icing wind tunnel in the world, helps NASA and industry study how ice affects aircraft and test ice protection systems and tools.
Flying Full Circle: Acosta still attends airshows every chance he can get and has taken both his father and wife soaring into the clouds.
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By NASA
Learn Home Astro Campers SCoPE Out New… Astrophysics Overview Learning Resources Science Activation Teams SME Map Opportunities More Science Stories Science Activation Highlights Citizen Science 2 min read
Astro Campers SCoPE Out New Worlds
Teachers at Smokey Mountain Elementary School have collaborated with the NASA Science Activation (SciAct) program’s Smoky Mountains STEM (Science, Technology, Engineering, and Mathematics) Collaborative (SMSC) and project coordinator, Randi Neff, to create a summer camp for students who are passionate about STEM topics. What started as a small summer camp has since evolved into Astro Camp, a two-week community program from the NASA Astro Camp Community Partners (part of the NASA SciAct program infrastructure) with many engaging student activities.
Many students have enjoyed this camp from the beginning, and those who have participated annually have become increasingly interested in more challenging and robust activities to continue their learning adventures. With the help of SciAct’s NASA SCoPE (the NASA Science Mission Directorate Community of Practice for Education) team, Neff was able to connect teachers with a NASA Subject Matter Expert, Dr. Alissa Bans, to help draft new, challenging activities for the students who were ready to take them on in June 2024. Of course, new attendees and learners continued to excitedly engage in the foundational Astro Camp activities, as appropriate for their learning levels.
Thanks to Dr. Bans and the ongoing collaboration of these three SciAct teams, returning campers took on new challenges identifying and observing goldilocks exoplanets and zones (habitable planets outside our solar system and zones where conditions might be just right – neither too hot nor too cold – for life) and exploring the various conditions that might support life on a planet. Having the opportunity to seek out and tackle more advanced STEM topics, learners developed critical thinking skills and found satisfaction in expanding their science identities.
The Smoky Mountains STEM Collaborative, NASA SCoPE, and NASA Astro Camp Community Partners projects are supported by NASA as part of the Science Activation program 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
Dr. Alissa Bans, a NASA Subject Matter Expert with NASA SCoPE, leads an activity with a group of students during Astro Camp. Share
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