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By NASA
6 Min Read NASA’s Webb Captures Neptune’s Auroras For First Time
At the left, an enhanced-color image of Neptune from NASA’s Hubble Space Telescope. At the right, that image is combined with data from NASA’s James Webb Space Telescope. Credits:
NASA, ESA, CSA, STScI, Heidi Hammel (AURA), Henrik Melin (Northumbria University), Leigh Fletcher (University of Leicester), Stefanie Milam (NASA-GSFC) Long-sought auroral glow finally emerges under Webb’s powerful gaze
For the first time, NASA’s James Webb Space Telescope has captured bright auroral activity on Neptune. Auroras occur when energetic particles, often originating from the Sun, become trapped in a planet’s magnetic field and eventually strike the upper atmosphere. The energy released during these collisions creates the signature glow.
In the past, astronomers have seen tantalizing hints of auroral activity on Neptune, for example, in the flyby of NASA’s Voyager 2 in 1989. However, imaging and confirming the auroras on Neptune has long evaded astronomers despite successful detections on Jupiter, Saturn, and Uranus. Neptune was the missing piece of the puzzle when it came to detecting auroras on the giant planets of our solar system.
“Turns out, actually imaging the auroral activity on Neptune was only possible with Webb’s near-infrared sensitivity,” said lead author Henrik Melin of Northumbria University, who conducted the research while at the University of Leicester. “It was so stunning to not just see the auroras, but the detail and clarity of the signature really shocked me.”
The data was obtained in June 2023 using Webb’s Near-Infrared Spectrograph. In addition to the image of the planet, astronomers obtained a spectrum to characterize the composition and measure the temperature of the planet’s upper atmosphere (the ionosphere). For the first time, they found an extremely prominent emission line signifying the presence of the trihydrogen cation (H3+), which can be created in auroras. In the Webb images of Neptune, the glowing aurora appears as splotches represented in cyan.
Image A:
Neptune’s Auroras – Hubble and Webb
At the left, an enhanced-color image of Neptune from NASA’s Hubble Space Telescope. At the right, that image is combined with data from NASA’s James Webb Space Telescope. The cyan splotches, which represent auroral activity, and white clouds, are data from Webb’s Near-Infrared Spectrograph (NIRSpec), overlayed on top of the full image of the planet from Hubble’s Wide Field Camera 3. NASA, ESA, CSA, STScI, Heidi Hammel (AURA), Henrik Melin (Northumbria University), Leigh Fletcher (University of Leicester), Stefanie Milam (NASA-GSFC) “H3+ has a been a clear signifier on all the gas giants — Jupiter, Saturn, and Uranus — of auroral activity, and we expected to see the same on Neptune as we investigated the planet over the years with the best ground-based facilities available,” explained Heidi Hammel of the Association of Universities for Research in Astronomy, Webb interdisciplinary scientist and leader of the Guaranteed Time Observation program for the Solar System in which the data were obtained. “Only with a machine like Webb have we finally gotten that confirmation.”
The auroral activity seen on Neptune is also noticeably different from what we are accustomed to seeing here on Earth, or even Jupiter or Saturn. Instead of being confined to the planet’s northern and southern poles, Neptune’s auroras are located at the planet’s geographic mid-latitudes — think where South America is located on Earth.
This is due to the strange nature of Neptune’s magnetic field, originally discovered by Voyager 2 in 1989 which is tilted by 47 degrees from the planet’s rotation axis. Since auroral activity is based where the magnetic fields converge into the planet’s atmosphere, Neptune’s auroras are far from its rotational poles.
The ground-breaking detection of Neptune’s auroras will help us understand how Neptune’s magnetic field interacts with particles that stream out from the Sun to the distant reaches of our solar system, a totally new window in ice giant atmospheric science.
From the Webb observations, the team also measured the temperature of the top of Neptune’s atmosphere for the first time since Voyager 2’s flyby. The results hint at why Neptune’s auroras remained hidden from astronomers for so long.
“I was astonished — Neptune’s upper atmosphere has cooled by several hundreds of degrees,” Melin said. “In fact, the temperature in 2023 was just over half of that in 1989.”
Through the years, astronomers have predicted the intensity of Neptune’s auroras based on the temperature recorded by Voyager 2. A substantially colder temperature would result in much fainter auroras. This cold temperature is likely the reason that Neptune’s auroras have remained undetected for so long. The dramatic cooling also suggests that this region of the atmosphere can change greatly even though the planet sits over 30 times farther from the Sun compared to Earth.
Equipped with these new findings, astronomers now hope to study Neptune with Webb over a full solar cycle, an 11-year period of activity driven by the Sun’s magnetic field. Results could provide insights into the origin of Neptune’s bizarre magnetic field, and even explain why it’s so tilted.
“As we look ahead and dream of future missions to Uranus and Neptune, we now know how important it will be to have instruments tuned to the wavelengths of infrared light to continue to study the auroras,” added Leigh Fletcher of Leicester University, co-author on the paper. “This observatory has finally opened the window onto this last, previously hidden ionosphere of the giant planets.”
These observations, led by Fletcher, were taken as part of Hammel’s Guaranteed Time Observation program 1249. The team’s results have been published in Nature Astronomy.
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.
Hannah Braun- hbraun@stsci.edu
Space Telescope Science Institute, Baltimore, Maryland
Christine Pulliam – cpulliam@stsci.edu
Space Telescope Science Institute, Baltimore, Md.
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Henrik Melin (Northumbria University)
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Last Updated Mar 25, 2025 Editor Stephen Sabia Contact Laura Betz laura.e.betz@nasa.gov Related Terms
James Webb Space Telescope (JWST) Astrophysics Goddard Space Flight Center Neptune Planetary Science Planets Science & Research The Solar System View the full article
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By European Space Agency
Image: ESA's Atomic Clock Ensemble in Space at NASA's Kennedy Space Center View the full article
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By Space Force
U.S. Space Force Col. Nick Hague returned to Earth following a six-month mission aboard the International Space Station, March 18, 2025.
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By NASA
NASA astronauts Nick Hague, Suni Williams, Butch Wilmore, and Roscosmos cosmonaut Aleksandr Gorbunov land in a SpaceX Dragon spacecraft in the water off the coast of Tallahassee, Florida on March 18, 2025. Hague, Gorbunov, Williams, and Wilmore returned from a long-duration science expedition aboard the International Space Station. Credit: NASA/Keegan Barber NASA’s SpaceX Crew-9 completed the agency’s ninth commercial crew rotation mission to the International Space Station on Tuesday, splashing down safely in a SpaceX Dragon spacecraft off the coast of Tallahassee, Florida, in the Gulf of America.
NASA astronauts Nick Hague, Suni Williams, and Butch Wilmore, and Roscosmos cosmonaut Aleksandr Gorbunov, returned to Earth at 5:57 p.m. EDT. Teams aboard SpaceX recovery vessels retrieved the spacecraft and its crew. After returning to shore, the crew will fly to NASA’s Johnson Space Center in Houston and reunite with their families.
“We are thrilled to have Suni, Butch, Nick, and Aleksandr home after their months-long mission conducting vital science, technology demonstrations, and maintenance aboard the International Space Station,” said NASA acting Administrator Janet Petro. “Per President Trump’s direction, NASA and SpaceX worked diligently to pull the schedule a month earlier. This international crew and our teams on the ground embraced the Trump Administration’s challenge of an updated, and somewhat unique, mission plan, to bring our crew home. Through preparation, ingenuity, and dedication, we achieve great things together for the benefit of humanity, pushing the boundaries of what is possible from low Earth orbit to the Moon and Mars.”
Hague and Gorbunov lifted off at 1:17 p.m. Sept. 28, 2024, on a SpaceX Falcon 9 rocket from Space Launch Complex 40 at Cape Canaveral Space Force Station in Florida. The next day, they docked to the forward-facing port of the station’s Harmony module. Williams and Wilmore launched aboard Boeing’s Starliner spacecraft and United Launch Alliance Atlas V rocket on June 5, 2024, from Space Launch Complex 41 as part of the agency’s Boeing Crew Flight Test. The duo arrived at the space station on June 6. In August, NASA announced the uncrewed return of Starliner to Earth and integrated Wilmore and Williams as part of the space station’s Expedition 71/72 for a return on Crew-9. The crew of four undocked at 1:05 a.m. Tuesday to begin the trip home.
Williams and Wilmore traveled 121,347,491 miles during their mission, spent 286 days in space, and completed 4,576 orbits around Earth. Hague and Gorbunov traveled 72,553,920 miles during their mission, spent 171 days in space, and completed 2,736 orbits around Earth. The Crew-9 mission was the first spaceflight for Gorbunov. Hague has logged 374 days in space over his two missions, Williams has logged 608 days in space over her three flights, and Wilmore has logged 464 days in space over his three flights.
Throughout its mission, Crew-9 contributed to a host of science and maintenance activities and technology demonstrations. Williams conducted two spacewalks, joined by Wilmore for one and Hague for another, removing a radio frequency group antenna assembly from the station’s truss, collecting samples from the station’s external surface for analysis, installing patches to cover damaged areas of light filters on an X-ray telescope, and more. Williams now holds the record for total spacewalking time by a female astronaut, with 62 hours and 6 minutes outside of station, and is fourth on the all-time spacewalk duration list.
The American crew members conducted more than 150 unique scientific experiments and technology demonstrations between them, with over 900 hours of research. This research included investigations on plant growth and quality, as well as the potential of stem cell technology to address blood diseases, autoimmune disorders, and cancers. They also tested lighting systems to help astronauts maintain circadian rhythms, loaded the first wooden satellite for deployment, and took samples from the space station’s exterior to study whether microorganisms can survive in space.
The Crew-9 mission was the fourth flight of the Dragon spacecraft named Freedom. It also previously supported NASA’s SpaceX Crew-4, Axiom Mission 2, and Axiom Mission 3. The spacecraft will return to Florida for inspection and processing at SpaceX’s refurbishing facility at Cape Canaveral Space Force Station, where teams will inspect the Dragon, analyze data on its performance, and begin processing for its next flight.
The Crew-9 flight is part of NASA’s Commercial Crew Program, and its return to Earth follows on the heels of NASA’s SpaceX Crew-10 launch, which docked to the station on March 16, beginning another long-duration science expedition.
The goal of NASA’s Commercial Crew Program is safe, reliable, and cost-effective transportation to and from the space station and low Earth orbit. The program provides additional research time and has increased opportunities for discovery aboard humanity’s microgravity testbed for exploration, including helping NASA prepare for human exploration of the Moon and Mars.
Learn more about NASA’s Commercial Crew Program at:
https://www.nasa.gov/commercialcrew
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Amber Jacobson / Joshua Finch
Headquarters, Washington
202-358-1100
amber.c.jacobson@nasa.gov / joshua.a.finch@nasa.gov
Kenna Pell / Sandra Jones
Johnson Space Center, Houston
281-483-5111
kenna.m.pell@nasa.gov / sandra.p.jones@nasa.gov
Steve Siceloff / Stephanie Plucinsky
Kennedy Space Center, Florida
321-867-2468
steven.p.siceloff@nasa.gov / stephanie.n.plucinsky@nasa.gov
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Last Updated Mar 18, 2025 EditorJessica TaveauLocationNASA Headquarters Related Terms
Humans in Space Expedition 72 International Space Station (ISS) ISS Research Space Operations Mission Directorate View the full article
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By NASA
After delivering ten NASA science and technology payloads to the near side of the Moon through NASA’s CLPS (Commercial Lunar Payload Services) initiative and Artemis campaign, Firefly Aerospace’s Blue Ghost Mission 1 lander captured this image of a sunset from the lunar surface. Credit: Firefly Aerospace After landing on the Moon with NASA science and technology demonstrations March 2, Firefly Aerospace’s Blue Ghost Mission 1 concluded its mission March 16. Analysis of data returned to Earth from the NASA instruments continues, benefitting future lunar missions.
As part of NASA’s CLPS (Commercial Lunar Payload Services) initiative and Artemis campaign, Firefly’s Blue Ghost lunar lander delivered 10 NASA science and technology instruments to the Mare Crisium basin on the near side of the Moon. During the mission, Blue Ghost captured several images and videos, including imaging a total solar eclipse and a sunset from the surface of the Moon. The mission lasted for about 14 days, or the equivalent of one lunar day, and multiple hours into the lunar night before coming to an end.
“Firefly’s Blue Ghost Mission 1 marks the longest surface duration commercial mission on the Moon to date, collecting extraordinary science data that will benefit humanity for decades to come,” said Nicky Fox, associate administrator, Science Mission Directorate at NASA Headquarters in Washington. “With NASA’s CLPS initiative, American companies are now at the forefront of an emerging lunar economy that lights the way for the agency’s exploration goals on the Moon and beyond.”
All 10 NASA payloads successfully activated, collected data, and performed operations on the Moon. Throughout the mission, Blue Ghost transmitted 119 gigabytes of data back to Earth, including 51 gigabytes of science and technology data. In addition, all payloads were afforded additional opportunities to conduct science and gather more data for analysis, including during the eclipse and lunar sunset.
“Operating on the Moon is complex; carrying 10 payloads, more than has ever flown on a CLPS delivery before, makes the mission that much more impressive,” said Joel Kearns, deputy associate administrator for exploration, Science Mission Directorate, NASA Headquarters. “Teams are eagerly analyzing their data, and we are extremely excited for the expected scientific findings that will be gained from this mission.”
Among other achievements, many of the NASA instruments performed first-of-their-kind science and technology demonstrations, including:
The Lunar Instrumentation for Subsurface Thermal Exploration with Rapidity is now the deepest robotic planetary subsurface thermal probe, drilling up to 3 feet and providing a first-of-its kind demonstration of robotic thermal measurements at varying depths. The Lunar GNSS Receiver Experiment acquired and tracked Global Navigation Satellite Systems (GNSS) signals, from satellite networks such as GPS and Galileo, for the first time enroute to and on the Moon’s surface. The LuGRE payload’s record-breaking success indicates that GNSS signals could complement other navigation methods and be used to support future Artemis missions. It also acts as a stepping stone to future navigation systems on Mars. The Radiation Tolerant Computer successfully operated in transit through Earth’s Van Allen belts, as well as on the lunar surface into the lunar night, verifying solutions to mitigate radiation effects on computers that could make future missions safer for equipment and more cost effective. The Electrodynamic Dust Shield successfully lifted and removed lunar soil, or regolith, from surfaces using electrodynamic forces, demonstrating a promising solution for dust mitigation on future lunar and interplanetary surface operations. The Lunar Magnetotelluric Sounder successfully deployed five sensors to study the Moon’s interior by measuring electric and magnetic fields. The instrument allows scientists to characterize the interior of the Moon to depths up to 700 miles, or more than half the distance to the Moon’s center. The Lunar Environment heliospheric X-ray Imager captured a series of X-ray images to study the interaction of the solar wind and Earth’s magnetic field, providing insights into how space weather and other cosmic forces surrounding Earth affect the planet. The Next Generation Lunar Retroreflector successfully reflected and returned laser light from two Lunar Laser Ranging Observatories, returning measurements allowing scientists to precisely measure the Moon’s shape and distance from Earth, expanding our understanding of the Moon’s inner structure. The Stereo Cameras for Lunar Plume-Surface Studies instrument captured about 9,000 images during the spacecraft’s lunar descent and touchdown on the Moon, providing insights into the effects engine plumes have on the surface. The payload also operated during the lunar sunset and into the lunar night. The Lunar PlanetVac was deployed on the lander’s surface access arm and successfully collected, transferred, and sorted lunar soil using pressurized nitrogen gas, demonstrating a low-cost, low-mass solution for future robotic sample collection. The Regolith Adherence Characterization instrument examined how lunar regolith sticks to a range of materials exposed to the Moon’s environment, which can help test, improve, and protect spacecraft, spacesuits, and habitats from abrasive lunar dust or regolith. The data captured will benefit humanity in many ways, providing insights into how space weather and other cosmic forces may impact Earth. Establishing an improved awareness of the lunar environment ahead of future crewed missions will help plan for long-duration surface operations under Artemis.
To date, five vendors have been awarded 11 lunar deliveries under CLPS and are sending more than 50 instruments to various locations on the Moon, including the lunar South Pole and far side.
Learn more about NASA’s CLPS initiative at:
https://www.nasa.gov/clps
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Alise Fisher
Headquarters, Washington
202-617-4977
alise.m.fisher@nasa.gov
Natalia Riusech / Nilufar Ramji
Johnson Space Center, Houston
281-483-5111
nataila.s.riusech@nasa.gov / nilufar.ramji@nasa.gov
Antonia Jaramillo
Kennedy Space Center, Florida
321-501-8425
antonia.jaramillobotero@nasa.gov
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Last Updated Mar 18, 2025 LocationNASA Headquarters Related Terms
Commercial Lunar Payload Services (CLPS) Artemis Blue Ghost (lander) Johnson Space Center Kennedy Space Center NASA Headquarters View the full article
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