NASA Measures Moonlight to Improve Earth Observations

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Flying high above the clouds and moon-gazing may sound like a scene from a timeless romance, but NASA did just that in the name of Earth science research. In March 2025 pilots took the agency’s ER-2 science aircraft on a series of night flights over NASA’s Armstrong Flight Research Center in Edwards, California, as the Moon increased in visible size. For those few nights, the high-flying plane was converted into a one-of-a-kind airborne lunar observatory.
The Airborne Lunar Spectral Irradiance, or air-LUSI, mission observed the Moon at different phases and measured the sunlight reflected by the lunar surface. Specifically, the instrument tracks the amount of light reflected at different wavelengths. This information enables scientists to use the Moon as a calibration tool for Earth-observing sensors.
As an “absolute reference, the Moon also becomes the perfect benchmark for satellites to consistently and accurately measure processes on Earth,” said Kevin Turpie, air-LUSI’s principal investigator and a researcher based at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. This helps scientists to improve the precision of many different measurements, including data on weather patterns, vegetation growth, and ocean conditions.
As the highest-flying platform for airborne science, the ER-2 can fly the air-LUSI instrument in the stratosphere, above 95% of the atmosphere. Data collected at an altitude nearing 70,000 feet are highly accurate because the air is predominantly clear of the gases and particles found in the lower atmosphere that can interfere with measurements.

“To date, air-LUSI measurements of the Moon are the most accurate ever made,” said Kelsey Bisson, the NASA program scientist supporting the mission. “Air-LUSI data can advance our ability to understand the Earth and our weather, and they provide a new way to calibrate satellites that can result in cost savings.”
The quality of these data has transformative implications for satellite and Earth observing systems. The improved accuracy and enhanced ability provided by air-LUSI data flown on the ER-2 reduces the need for onboard reference devices, effectually cutting satellite costs.
The air-LUSI project is a collaboration between scientists and engineers from NASA, the National Institute of Standards and Technology, the U.S. Geological Survey, the University of Maryland Baltimore County, and McMaster University in Ontario.

“The collective effort of the American and Canadian team members offers an opportunity for truly exciting engineering and science collaboration,” said Andrew Gadsden, associate professor and associate chair for graduate studies in mechanical engineering at McMaster University, and co-investigator on the air-LUSI project. The McMaster team developed the Autonomous Robotic Telescope Mount Instrument System and High-Altitude Aircraft Mounted Robotic (HAAMR) telescope mount, which support the air-LUSI system.

The HAAMR telescope mount was integrated onto the ER-2 and flown for the first time during the science flights in March. This new lunar tracking system is contributing to what John Woodward IV, co-investigator for air-LUSI, called the “highest accuracy measurements” of moonlight. To improve Earth observation technology, air-LUSI represents an important evolutionary step. Läs mer…

NASA Webb’s Autopsy of Planet Swallowed by Star Yields Surprise

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Observations from NASA’s James Webb Space Telescope have provided a surprising twist in the narrative surrounding what is believed to be the first star observed in the act of swallowing a planet. The new findings suggest that the star actually did not swell to envelop a planet as previously hypothesized. Instead, Webb’s observations show the planet’s orbit shrank over time, slowly bringing the planet closer to its demise until it was engulfed in full.

“Because this is such a novel event, we didn’t quite know what to expect when we decided to point this telescope in its direction,” said Ryan Lau, lead author of the new paper and astronomer at NSF NOIRLab (National Science Foundation National Optical-Infrared Astronomy Research Laboratory) in Tuscon, Arizona. “With its high-resolution look in the infrared, we are learning valuable insights about the final fates of planetary systems, possibly including our own.”

Two instruments aboard Webb conducted the post-mortem of the scene – Webb’s MIRI (Mid-Infrared Instrument) and NIRSpec (Near-Infrared Spectrograph). The researchers were able to come to their conclusion using a two-pronged investigative approach.

The star at the center of this scene is located in the Milky Way galaxy about 12,000 light-years away from Earth.

The brightening event, formally called ZTF SLRN-2020, was originally spotted as a flash of optical light using the Zwicky Transient Facility at the Palomar Observatory in San Diego, California. Data from NASA’s NEOWISE (Near-Earth Object Wide-field Infrared Survey Explorer) showed the star actually brightened in the infrared a year before the optical light flash, hinting at the presence of dust. This initial 2023 investigation led researchers to believe that the star was more Sun-like, and had been in the process of aging into a red giant over hundreds of thousands of years, slowly expanding as it exhausted its hydrogen fuel.

However, Webb’s MIRI told a different story. With powerful sensitivity and spatial resolution, Webb was able to precisely measure the hidden emission from the star and its immediate surroundings, which lie in a very crowded region of space. The researchers found the star was not as bright as it should have been if it had evolved into a red giant, indicating there was no swelling to engulf the planet as once thought.

Researchers suggest that, at one point, the planet was about Jupiter-sized, but orbited quite close to the star, even closer than Mercury’s orbit around our Sun. Over millions of years, the planet orbited closer and closer to the star, leading to the catastrophic consequence.

“The planet eventually started to graze the star’s atmosphere. Then it was a runaway process of falling in faster from that moment,” said team member Morgan MacLeod of the Harvard-Smithsonian Center for Astrophysics and the Massachusetts Institute of Technology in Cambridge, Massachusetts. “The planet, as it’s falling in, started to sort of smear around the star.”

In its final splashdown, the planet would have blasted gas away from the outer layers of the star. As it expanded and cooled off, the heavy elements in this gas condensed into cold dust over the next year.

While the researchers did expect an expanding cloud of cooler dust around the star, a look with the powerful NIRSpec revealed a hot circumstellar disk of molecular gas closer in. Furthermore, Webb’s high spectral resolution was able to detect certain molecules in this accretion disk, including carbon monoxide.

“With such a transformative telescope like Webb, it was hard for me to have any expectations of what we’d find in the immediate surroundings of the star,” said Colette Salyk of Vassar College in Poughkeepsie, New York, an exoplanet researcher and co-author on the new paper. “I will say, I could not have expected seeing what has the characteristics of a planet-forming region, even though planets are not forming here, in the aftermath of an engulfment.”

The ability to characterize this gas opens more questions for researchers about what actually happened once the planet was fully swallowed by the star.

“This is truly the precipice of studying these events. This is the only one we’ve observed in action, and this is the best detection of the aftermath after things have settled back down,” Lau said. “We hope this is just the start of our sample.”

These observations, taken under Guaranteed Time Observation program 1240, which was specifically designed to investigate a family of mysterious, sudden, infrared brightening events, were among the first Target of Opportunity programs performed by Webb. These types of study are reserved for events, like supernova explosions, that are expected to occur, but researchers don’t exactly know when or where. NASA’s space telescopes are part of a growing, international network that stands ready to witness these fleeting changes, to help us understand how the universe works.

Researchers expect to add to their sample and identify future events like this using the upcoming Vera C. Rubin Observatory and NASA’s Nancy Grace Roman Space Telescope, which will survey large areas of the sky repeatedly to look for changes over time.

The team’s findings appear today in The Astrophysical Journal.

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).

To learn more about Webb, visit: https://science.nasa.gov/webb

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Laura Betz – laura.e.betz@nasa.govNASA’s Goddard Space Flight Center, Greenbelt, Md.

Hannah Braun – hbraun@stsci.eduSpace Telescope Science Institute, Baltimore, Md.

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Eclipses, Science, NASA Firsts: Heliophysics Big Year Highlights 

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One year ago today, a total solar eclipse swept across the United States. The event was a cornerstone moment in the Heliophysics Big Year, a global celebration of the Sun’s influence on Earth and the entire solar system. From October 2023 to December 2024 — a period encompassing two solar eclipses across the U.S., two new NASA heliophysics missions, and one spacecraft’s history-making solar flyby — NASA celebrated the Sun’s widespread influence on our lives.  

An annular (or “ring of fire”) solar eclipse occurred Oct. 14, 2023, and kicked off the Helio Big Year with a bang. Millions of people across North America witnessed the Moon crossing in front of the Sun, creating this brilliant celestial event. NASA’s live broadcast had more than 11 million views across different platforms.  

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On Oct. 14, 2023, an annular solar eclipse crossed North, Central, and South America. Visible in parts of the United States, Mexico, and many countries in South and Central America, millions of people in the Western Hemisphere were able to experience this “ring of fire” eclipse. NASA’s official broadcast and outreach teams were located in Kerrville, TX, and Albuquerque, NM, to capture the event and celebrate with the communities in the path of annularity. Credit: NASA/Ryan Fitzgibbons 

Before the eclipse, NASA introduced the 2023 Eclipse Explorer, an interactive map to explore eclipse details for any location in the United States. NASA shared tips on eclipse safety, including through a video with NSYNC’s Lance Bass and even with an augmented reality filter. 

Scientists also studied conditions during the annular eclipse with sounding rockets, balloons, and amateur radio.  

On April 8, 2024, millions of people across North America experienced a total solar eclipse that darkened parts of 15 U.S. states in the path of totality.  

Ahead of the event, NASA hosted a widespread safety campaign, handed out over 2 million solar viewing glasses, and produced an interactive map to help viewers plan their viewing experience. On eclipse day, NASA also hosted a live broadcast from locations across the country, drawing over 38 million views. 

Researchers studied the eclipse and its effects on Earth using a variety of techniques, including international radar networks, scientific rockets, weather balloons, and even high-altitude NASA WB-57 jets. Several NASA-funded citizen science projects also conducted experiments. These projects included more than 49,000 volunteers who contributed an astounding 53 million observations.  

“We have opened a window for all Americans to discover our connection to the Sun and ignited enthusiasm for engaging with groundbreaking NASA science, whether it’s through spacecraft, rockets, balloons, or planes,” said Kelly Korreck, a Heliophysics program scientist at NASA Headquarters in Washington. “Sharing the excitement of NASA heliophysics with our fellow citizens has truly been amazing.” 

NASA’s heliophysics missions gather data on the Sun and its effects across the solar system.  

The Atmospheric Waves Experiment (AWE) mission launched from NASA’s Kennedy Space Center in Florida Nov. 9, 2023, and was installed on the International Space Station nine days later. This mission studies atmospheric gravity waves, how they form and travel through Earth’s atmosphere, and their role in space weather. 

On Nov. 4, 2024, the Coronal Diagnostic Experiment (CODEX) mission also launched to the space station, where it studies the solar wind, with a focus on what heats it and propels it through space.  

The Aeronomy of Ice in the Mesosphere (AIM) mission ended after 16 years studying Earth’s highest clouds, called polar mesospheric clouds.  

NASA’s Ionospheric Connection Explorer (ICON) also ended after three successful years studying the outermost layer of Earth’s atmosphere, called the ionosphere. 

Voyager has been operating for more than 47 years, continuing to study the heliosphere and interstellar space. In October 2024, the Voyager 1 probe stopped communicating. The mission team worked tirelessly to troubleshoot and ultimately reestablish communications, keeping the mission alive to continue its research.  

While the goal of the NASA heliophysics fleet is to study the Sun and its influence, these missions often make surprising discoveries that they weren’t originally designed to. From finding 5,000 comets to studying the surface of Venus, NASA highlighted and celebrated these bonus science connections during the Helio Big Year. 

Similar to Earth, the Sun has its own seasons of activity, with a solar minimum and solar maximum during a cycle that lasts about 11 years. The Helio Big Year happened to coincide with the Sun’s active period, with NASA and NOAA announcing in October 2024 that the Sun had reached solar maximum, the highest period of activity. Some of the largest solar storms on current record occurred in 2024, and the largest sunspot in nearly a decade was spotted in the spring of 2024, followed by a colossal X9.0 solar flare Oct. 3, 2024.  

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Sunspots are cooler, darker areas on the solar surface where the Sun’s magnetic field gets especially intense, often leading to explosive solar eruptions. This sunspot group was so big that nearly 14 Earths could fit inside it! The eruptions from this region resulted in the historic May 2024 geomagnetic storms, when the aurora borealis, or northern lights, were seen as far south as the Florida Keys.Credit: NASA/Beth Anthony

Viewers across the U.S. spotted auroras in their communities as a result of these storms, proving that you can capture amazing aurora photography without advanced equipment. 

NASA’s Parker Solar Probe holds the title as the closest human-made object to the Sun. On Dec. 24, 2024, Parker made history by traveling just 3.8 million miles from the Sun’s surface at a whopping 430,000 miles per hour.  

”Flying this close to the Sun is a historic moment in humanity’s first mission to a star,” said Nicky Fox, associate administrator, Science Mission Directorate, NASA Headquarters. 

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Controllers have confirmed NASA’s mission to “touch” the Sun survived its record-breaking closest approach to the solar surface on Dec. 24, 2024. Credit: NASA/Joy Ng

Parker Solar Probe’s close approach capped off a momentous Heliophysics Big Year that allowed NASA scientists to gather unprecedented data and invited everyone to celebrate how the Sun impacts us all. In the growing field of heliophysics, the Helio Big Year reminded us all how the Sun touches everything and how important it is to continue studying our star’s incredible influence.  

Though the Helio Big Year is over, heliophysics is only picking up its pace in 2025. We remain in the solar maximum phase, so heightened solar activity will continue into the near future. In addition, several new missions are expected to join the heliophysics fleet by year’s end. 

The PUNCH mission, a set of four Sun-watching satellites imaging solar eruptions in three dimensions, and EZIE, a trio of Earth-orbiting satellites tracing the electrical currents powering Earth’s auroras, have already launched. The LEXI instrument, an X-ray telescope studying Earth’s magnetosphere from the Moon, also launched through NASA’s CLPS (Commercial Lunar Payload Services) initiative. 

Future missions slated for launch include TRACERS, which will investigate the unusual magnetic environment near Earth’s poles, and ESCAPADE, venturing to Mars to measure the planet’s unique magnetic environment. 

The last two missions will share a ride to space. The Carruthers Geocorona Observatory will look back at home, studying ultraviolet light emitted by the outermost boundaries of our planet’s atmosphere. The IMAP mission will instead look to the outermost edges of our heliosphere, mapping the boundaries where the domain of our Sun transitions into interstellar space. 

By Desiree ApodacaNASA’s Goddard Space Flight Center Läs mer…