Progress Cargo Craft Departs Station After Six Months
Feb. 25, 2025: International Space Station Configuration. Four spaceships are parked at the space station including the SpaceX Dragon crew spacecraft, the Northrop Grumman Cygnus resupply ship, the Soyuz MS-26 crew ship, and the Progress 90 resupply ship.
NASA
The unpiloted Roscosmos Progress 89 spacecraft undocked from the International Space Station at 3:17 p.m. EST, Feb. 25, backing away from the station for a deorbit maneuver and destructive re-entry into Earth’s atmosphere to dispose of trash loaded by the crew.
The spacecraft launched Aug. 14 on a Soyuz rocket from the Baikonur Cosmodrome in Kazakhstan, carrying about three tons of food, fuel, and supplies for the crew aboard the International Space Station. After a two-day in-orbit journey to the station, the spacecraft arrived at the orbiting laboratory Aug. 17 and automatically docked to the aft port of the orbiting laboratory’s Zvezda Service module.
Free Flying Robotics, Space Agriculture Ahead of Cargo Mission Swap
Astronaut Suni Williams monitors an Astrobee robotic free-flyer outfitted with tentacle-like arms containing gecko-like adhesive pads as it grapples a “capture cube.”
NASA
Free flying robotics and space agriculture topped Tuesday’s research schedule as the Expedition 72 crew helps advance the space industry. The International Space Station will also see the departure of a cargo craft and the arrival of its replacement this week.
NASA’s station Commander Suni Williams began her day setting up and activating the Astrobee robotic assistant, a cube-shaped, toaster-sized technology demonstration device, inside the Kibo laboratory module. Next, she outfitted the Astrobee with tentacle-like grippers for a test of its ability to autonomously detect and capture simulated orbital debris. Afterward, ground controllers took control of Astrobee and programmed the robotic free flyer to perform maneuvers to locate a capture target then reach out and grapple the free-floating object. Researchers are testing the ability of robots to safely remove orbital debris and protect satellites.
Following the robotics demonstration, NASA Flight Engineer Don Pettit worked in Kibo installing research components on the Advanced Plant Habitat hosting growing Red Romaine lettuce. The space botany hardware divided the young plants into quadrants for observation and provided a temperature sensor device measuring leaf temperature between watering periods. Insights from the Plant Habitat-07 investigation may inform ways to grow crops on future space missions.
NASA astronauts Nick Hague and Butch Wilmore spent their day primarily focusing on science hardware, life support maintenance, and cargo transfers. Hague started his shift in the Columbus laboratory module partially uninstalling the Navigation and Communication Testbed that could provide a more accurate alternative to satellite systems for lunar navigation. Hague then powered up a pair of incubators for biology research later in the week. Wilmore began his day draining recycling tanks then loaded trash inside the Cygnus space freighter ahead of its departure next month. Wilmore wrapped up his shift installing software on a science laptop computer in the Destiny laboratory module.
Roscosmos’ Progress 89 cargo craft is poised to depart the space station at 3:17 p.m. EST today when it undocks from the Zvezda service module’s aft port completing a six-month cargo mission. It will be replaced by the Progress 91 cargo craft after it launches at 4:24 p.m. on Thursday from the Baikonur Cosmodrome in Kazakhstan. The Progress 91, carrying three tons of food, fuel, and supplies, will dock to Zvezda’s vacant port at 6:03 p.m. on Saturday where it will stay for another six months.
Cosmonauts Alexey Ovchinin and Ivan Vagner prepared on Tuesday for the Progress 91’s arrival setting up the TORU, or tele-robotically operated rendezvous unit, inside Zvezda. The TORU can be used to command and control an approaching spacecraft from Roscosmos if necessary.
Vagner then moved on and scanned cosmonaut Aleksandr Gorbunov’s eyes with the Ultrasound 2 device for a regularly schedule exam. Gorbunov also completed a 24-hour session that measured his cardiac activity and blood pressure with portable electrodes.
NASA’s EZIE Launching to Study Magnetic Fingerprints of Earth’s Aurora
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NASA’s EZIE Launching to Study Magnetic Fingerprints of Earth’s Aurora
High above Earth’s poles, intense electrical currents called electrojets flow through the upper atmosphere when auroras glow in the sky. These auroral electrojets push about a million amps of electrical charge around the poles every second. They can create some of the largest magnetic disturbances on the ground, and rapid changes in the currents can lead to effects such as power outages. In March, NASA plans to launch its EZIE (Electrojet Zeeman Imaging Explorer) mission to learn more about these powerful currents, in the hopes of ultimately mitigating the effects of such space weather for humans on Earth.
Results from EZIE will help NASA better understand the dynamics of the Earth-Sun connection and help improve predictions of hazardous space weather that can harm astronauts, interfere with satellites, and trigger power outages.
The EZIE mission includes three CubeSats, each about the size of a carry-on suitcase. These small satellites will fly in a pearls-on-a-string formation, following each other as they orbit Earth from pole to pole about 350 miles (550 kilometers) overhead. The spacecraft will look down toward the electrojets, which flow about 60 miles (100 kilometers) above the ground in an electrified layer of Earth’s atmosphere called the ionosphere.
During every orbit, each EZIE spacecraft will map the electrojets to uncover their structure and evolution. The spacecraft will fly over the same region 2 to 10 minutes apart from one another, revealing how the electrojets change.
NASA’s EZIE (Electrojet Zeeman Imaging Explorer) mission will use three CubeSats to map Earth’s auroral electrojets — intense electric currents that flow high above Earth’s polar regions when auroras glow in the sky. As the trio orbits Earth, each satellite will use four dishes pointed at different angles to measure magnetic fields created by the electrojets.
NASA/Johns Hopkins APL/Steve Gribben
Previous ground-based experiments and spacecraft have observed auroral electrojets, which are a small part of a vast electric circuit that extends 100,000 miles (160,000 kilometers) from Earth to space. But for decades, scientists have debated what the overall system looks like and how it evolves. The mission team expects EZIE to resolve that debate.
“What EZIE does is unique,” said Larry Kepko, EZIE mission scientist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “EZIE is the first mission dedicated exclusively to studying the electrojets, and it does so with a completely new measurement technique.”
EZIE is the first mission dedicated exclusively to studying the electrojets.
Larry Kepko
EZIE mission scientist, NASA’s Goddard Space Flight Center
This technique involves looking at microwave emission from oxygen molecules about 10 miles (16 kilometers) below the electrojets. Normally, oxygen molecules emit microwaves at a frequency of 118 Gigahertz. However, the electrojets create a magnetic field that can split apart that 118 Gigahertz emission line in a process called Zeeman splitting. The stronger the magnetic field, the farther apart the line is split.
Each of the three EZIE spacecraft will carry an instrument called the Microwave Electrojet Magnetogram to observe the Zeeman effect and measure the strength and direction of the electrojets’ magnetic fields. Built by NASA’s Jet Propulsion Laboratory (JPL) in Southern California, each of these instruments will use four antennas pointed at different angles to survey the magnetic fields along four different tracks as EZIE orbits.
The technology used in the Microwave Electrojet Magnetograms was originally developed to study Earth’s atmosphere and weather systems. Engineers at JPL had reduced the size of the radio detectors so they could fit on small satellites, including NASA’s TEMPEST-D and CubeRRT missions, and improved the components that separate light into specific wavelengths.
NASA’s EZIE (Electrojet Zeeman Imaging Explorer) mission will investigate Earth’s auroral electrojets, which flow high above Earth’s polar regions when auroras (northern and southern lights) glow. By providing unprecedented measurements of these electrical currents, EZIE will answer decades-old mysteries. Understanding these currents will also improve scientists’ capabilities for predicting hazardous space weather.
NASA/Johns Hopkins APL
The electrojets flow through a region that is difficult to study directly, as it’s too high for scientific balloons to reach but too low for satellites to dwell.
“The utilization of the Zeeman technique to remotely map current-induced magnetic fields is really a game-changing approach to get these measurements at an altitude that is notoriously difficult to measure,” said Sam Yee, EZIE’s principal investigator at the Johns Hopkins Applied Physics Laboratory (APL) in Laurel, Maryland.
The mission is also including citizen scientists to enhance its research, distributing dozens of EZIE-Mag magnetometer kits to students in the U.S. and volunteers around the world to compare EZIE’s observations to those from Earth. “EZIE scientists will be collecting magnetic field data from above, and the students will be collecting magnetic field data from the ground,” said Nelli Mosavi-Hoyer, EZIE project manager at APL.
EZIE scientists will be collecting magnetic field data from above, and the students will be collecting magnetic field data from the ground.
The EZIE spacecraft will launch aboard a SpaceX Falcon 9 rocket from Vandenberg Space Force Base in California as part of the Transporter-13 rideshare mission with SpaceX via launch integrator Maverick Space Systems.
The mission will launch during what’s known as solar maximum — a phase during the 11-year solar cycle when the Sun’s activity is stronger and more frequent. This is an advantage for EZIE’s science.
“It’s better to launch during solar max,” Kepko said. “The electrojets respond directly to solar activity.”
The EZIE mission will also work alongside other NASA heliophysics missions, including PUNCH (Polarimeter to Unify the Corona and Heliosphere), launching in late February to study how material in the Sun’s outer atmosphere becomes the solar wind.
According to Yee, EZIE’s CubeSat mission not only allows scientists to address compelling questions that have not been able to answer for decades but also demonstrates that great science can be achieved cost-effectively.
“We’re leveraging the new capability of CubeSats,” Kepko added. “This is a mission that couldn’t have flown a decade ago. It’s pushing the envelope of what is possible, all on a small satellite. It’s exciting to think about what we will discover.”
The EZIE mission is funded by the Heliophysics Division within NASA’s Science Mission Directorate and is managed by the Explorers Program Office at NASA Goddard. APL leads the mission for NASA. Blue Canyon Technologies in Boulder, Colorado, built the CubeSats.
by Vanessa Thomas NASA’s Goddard Space Flight Center, Greenbelt, Md.
Header Image: An artist’s concept shows the three EZIE satellites orbiting Earth. Credits: NASA/Johns Hopkins APL/Steve Gribben
NASA’s Lucy Spacecraft Takes Its 1st Images of Asteroid Donaldjohanson
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Preparations for Next Moonwalk Simulations Underway (and Underwater)
NASA’s Lucy spacecraft has its next flyby target, the small main belt asteroid Donaldjohanson, in its sights. By blinking between images captured by Lucy on Feb. 20 and 22, this animation shows the perceived motion of Donaldjohanson relative to the background stars as the spacecraft rapidly approaches the asteroid.
NASA’s Lucy spacecraft’s first views of the asteroid Donaldjohanson. The asteroid is outlined with a square in the right image to guide the eye.
NASA/Goddard/SwRI/Johns Hopkins APL
Lucy will pass within 596 miles (960 km) of the 2-mile-wide asteroid on April 20. This second asteroid encounter for the Lucy spacecraft will serve as a dress-rehearsal for the spacecraft’s main targets, the never-before-explored Jupiter Trojan asteroids. Lucy already successfully observed the tiny main belt asteroid Dinkinesh and its contact-binary moon, Selam, in November 2023. Lucy will continue to image Donaldjohanson over the next two months as part of its optical navigation program, which uses the asteroid’s apparent position against the star background to ensure an accurate flyby.
Donaldjohanson will remain an unresolved point of light during the spacecraft’s long approach and won’t start to show surface detail until the day of the encounter.
From a distance of 45 million miles (70 million km), Donaldjohanson is still dim, though it stands out clearly in this field of relatively faint stars in the constellation of Sextans. Celestial north is to the right of the frame, and the 0.11-degree field of view would correspond to 85,500 miles (140,000 km) at the distance of the asteroid. In the first of the two images, another dim asteroid can be seen photobombing in the lower right quadrant of the image. However, just as the headlights of an approaching car often appear relatively stationary, Donaldjohanson’s apparent motion between these two images is much smaller than that of this interloper, which has moved out of the field of view in the second image.
These observations were made by Lucy’s high-resolution camera, the L’LORRI instrument — short for Lucy LOng Range Reconnaissance Imager — provided by the Johns Hopkins Applied Physics Laboratory in Laurel, Maryland.
Asteroid Donaldjohanson is named for anthropologist Donald Johanson, who discovered the fossilized skeleton — called “Lucy” — of a human ancestor. NASA’s Lucy mission is named for the fossil.
Lucy’s principal investigator, Hal Levison, is based out of the Boulder, Colorado, branch of Southwest Research Institute, headquartered in San Antonio. NASA’s Goddard Space Flight Center in Greenbelt, Maryland, provides overall mission management, systems engineering, and safety and mission assurance. Lockheed Martin Space in Littleton, Colorado, built the spacecraft. Lucy is the 13th mission in NASA’s Discovery Program. NASA’s Marshall Space Flight Center in Huntsville, Alabama, manages the Discovery Program for the Science Mission Directorate at NASA Headquarters in Washington.
For more information about NASA’s Lucy mission, visit:
