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APOD: 2026 October 28 – The Mutual Occultation of Ganymede and Io

2026-10-28 04:05

APOD

Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

Michael Wong

The Mutual Occultation of Ganymede and Io

Explanation: Jupiter is one of the least lonely planets in the Solar System, at least when it comes to natural satellites. 115 moons have been discovered orbiting Jupiter so far! (Saturn has the most with 293, but who’s counting.) Ganymede and Io, two of Jupiter’s Galilean moons, met in the sky on October 20th, 2026. Today’s video captures the meeting, with Ganymede briefly blocking Io from view. This event, when an astronomical object passes in front of another and either completely or partially blocks it, is called a mutual occultation. The mutual occultations of Galilean moons are rare to witness because they require Earth’s edge-on view of their orbits. This occurs once every 6 years when Jupiter reaches its equinox and appears less “tilted”. Ganymede is also casting its shadow on Jupiter’s right side. Any fictional Jovian species within the shadow would experience a solar eclipse!

Tomorrow’s picture: a planet grows horns

Date: October 28, 2026
Credit & Copyright: Michael Wong
Authors & editors: Keighley Rockcliffe, Robert Nemiroff, Jerry Bonnell, Cecilia Chirenti
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.

The Land of the Standing-Up Rocks

2026-10-28 04:01

A satellite image shows Chiricahua National Park outlined in yellow amid mountainous terrain. Within the park, gray ridges are cut by green, vegetated canyons, two of which are labeled Bonita Canyon and Rhyolite Canyon. To the west, the land is flatter and redder with less vegetation.

Some 27 million years ago, a volcano in what’s now southeastern Arizona unleashed a spectacular series of eruptions, strewing more than 1,000 times as much volcanic material across the landscape as Mount St. Helens did in 1980.

The explosive eruptions blanketed the region, part of the Chiricahua Apache Nation’s traditional lands, with ash and pumice. Layered into this were massive pyroclastic flows that hardened into deposits of welded rhyolitic tuff that in some areas were nearly 1,600 feet (500 meters) thick, about three times the height of the Washington Monument. As the magma chamber emptied, the ground above it collapsed, leaving a gaping depression—the Turkey Creek caldera—that was roughly 12 miles (19 kilometers) wide and 4,900 feet (1,500 meters) deep.

An array of geologic processes, including erosion and weathering, gradually sculpted the welded layer of tuff into the collection of dramatic spires, hoodoos, and canyons that visitors to the caldera area encounter today.

The Apache called the area “The Land of the Standing-Up Rocks” for good reason. Hiking through Rhyolite Canyon or driving through Bonita Canyon means encountering a dizzying maze of rock pinnacles, some hundreds of feet tall. Others, like Big Balanced Rock, have surprisingly large boulders precariously perched on top. Meanwhile, those at Heart of Rocks and Massai Point are gathered into groups of hundreds.

The area was designated a national monument in 1924 to preserve its remarkable geology. In October 2026, it was redesignated as Chiricahua National Park (pronounced cheery-cow-ah). The OLI (Operational Land Imager) on Landsat 9 captured this cloud-free image of the new national park on July 2, 2026.

Individual rock spires are too small to distinguish, but the eroding rhyolitic tuff landscape appears gray. Stream valleys dense with trees and other vegetation, including Rhyolite Canyon and Bonita Canyon, snake across the landscape. With four biogeographic regions converging in the park—the Sonoran Desert, the Chihuahuan Desert, the Rocky Mountains, and the Sierra Madre—it is a haven of plant diversity.

Among the 1,000 species growing within the park’s varied desert, grassland, chaparral, deciduous forest, and coniferous forest ecosystems are agaves, prickly pear cacti, yuccas, manzanita, pine, fir, cypress, sycamore, juniper, and oak. The park’s location within the Chiricahua Mountains puts it among several “sky islands” in Arizona—isolated mountain ranges that emerge from the surrounding desert “sea.” According to the National Park Service, the range’s highest point (outside the park) rises 2,986 meters (9,795 feet) above sea level, more than 1,800 meters above the surrounding valley.

NASA Earth Observatory image by Lauren Dauphin, using Landsat data from the U.S. Geological Survey. Story by Adam Voiland.

References & Resources

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The Forested Floodplains of Congaree National Park

4 min read

The meandering Congaree River sustains towering forest ecosystems and fashions oxbow lakes as it shifts across its floodplain.

Article

Minute Man National Historical Park

3 min read

Sites relevant to the start of the American Revolutionary War are interspersed throughout the modern-day Boston metropolitan region.

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Colonial National Historical Park

2 min read

The colonial communities of “America’s historic triangle” played defining roles in the road to American independence.

Article

NASA Invites Media to Crew Completion of Yearlong Mars Simulation

2026-10-27 19:27

Crew Health and Performance Exploration Analog (CHAPEA) Mission 2 crew members (from left) Ross Elder, Matthew Montgomery, Ellen Ellis, and James Spicer, pose for a photo on Oct. 8, 2025.
Credit: NASA

The four volunteers who lived and worked in a simulated NASA Mars mission for more than a year will exit their habitat on Saturday, Oct. 31, after 378 days of isolation in a facility at the agency’s Johnson Space Center in Houston. Health and performance data collected from the simulation can help NASA develop methods to counter human spaceflight risks for future Artemis and Moon Base missions.

Beginning at 3 p.m. EDT, NASA will provide live coverage of the volunteers’ departure from the Crew Health and Performance Exploration Analog (CHAPEA, pronounced cha-pea’-ah) mission habitat. The exit ceremony will be streamed on NASA Johnson’s YouTube and social accounts.

Johnson Center Director Vanessa Wyche and NASA astronaut Jack Hathaway will provide remarks. The CHAPEA crew members Ross Elder, Ellen Ellis, James Spicer, and Matthew Montgomery also will provide remarks.

Media are invited to watch the CHAPEA Mission 2 ceremony live at NASA Johnson on a screen outside the hangar holding the CHAPEA facility, after which a subject matter expert will be available in person to answer questions. Media will have the opportunity to capture the moment the crew exits the building, stepping outside for the first time in more than a year.

U.S. media interested in attending the activities in person, or media interested in speaking virtually with the CHAPEA Mission 2 crew members in the days following completion of their mission, must contact the NASA Johnson newsroom no later than 2 p.m., Friday, Oct. 30, at jsc-newsroom@mail.nasa.gov. 

The second CHAPEA mission began on Oct. 19, 2025. Four crew members have lived and worked inside a 3D-printed 1,700-square-foot facility, simulating Mars mission operations, conducting simulated spacewalks, exercising, performing habitat maintenance, growing plants, and more, while operating under stressors that future deep space crews will likely experience. These included communication delays, resource limitations, and isolation.

Data from the mission can aid preparation for NASA’s lunar missions by optimizing food system design, efficient use of crew time, bandwidth on NASA’s Deep Space Network, and other aspects of living in deep space. In addition, data can help flight doctors and psychologists strengthen spaceflight medical care and behavioral support practices to ensure crew readiness and performance.

To learn more about NASA’s CHAPEA mission, visit:

https://www.nasa.gov/humans-in-space/chapea

-end-

Rachel Kraft
Headquarters, Washington
202-358-1600
rachel.h.kraft@nasa.gov

Kelsey Spivey
Johnson Space Center, Houston
281-483-5111
kelsey.m.spivey@nasa.gov

NASA’s Neo Surveyor Sunshade

2026-10-27 17:58

A technician in a white clean room gown and face mask shines a flashlight to inspect the dark, patterned cells of a large spacecraft solar array inside a clean room.
BAE Systems Space & Mission Systems

A technician inspects the large sunshade of NASA’s Near-Earth Object (NEO) Surveyor mission in this image released on Oct. 26, 2026. The sunshade structure, which stands 20 feet (6 meters) tall and measures 8 feet (2.4 meters) wide at its base, will keep the infrared space telescope cool as it searches for near-Earth asteroids and comets while also providing the spacecraft with power.

When in space, NEO Surveyor will detect some of the hardest-to-find asteroids and comets, some of which may be located in the direction of the Sun — a region of sky where ground-based optical telescopes have a harder time searching.

Read more about the sunshade and NEO Surveyor.

Image credit: BAE Systems Space & Mission Systems

How a Johnson Mentor Shapes the Next Generation of NASA Talent 

2026-10-27 07:07

3 Min Read

How a Johnson Mentor Shapes the Next Generation of NASA Talent 

Daniel Cohen, Guidance, Navigation & Control (GN&C) engineer at NASA’s Johnson Space Center, leads an outdoor orbital mechanics lesson for interns on Oct. 9, 2026. From left are Cohen, Lucas Anton Alonso-Munoyerro, Nathan Samuell, Marcos Pena, and Malvika Bhardwaj.
Credits: NASA

When Rice University student Malvika Bhardwaj asked her mentor Daniel Cohen, a Guidance, Navigation & Control (GN&C) engineer at NASA’s Johnson Space Center, whether he had time to keep teaching interns with his busy workload, he answered, “You decide what’s important.” 

In honor of National Mentoring Day on Oct. 27, Bhardwaj reflects on how Cohen’s advice and support has shaped her internship experience at Johnson. 

Through NASA’s Office of STEM Engagement, interns like Bhardwaj contribute to agency projects while learning from NASA mentors and gaining technical skills and hand-on experience to build a future career in space exploration. 

Bhardwaj studies computational and applied mathematics at Rice University and interns with the GN&C team, which focuses on how spacecraft determine their position and maneuver in orbit. She is developing tools to analyze thruster firings on the U.S. Deorbit Vehicle that will help NASA safely deorbit the International Space Station at the end of its operational life. Bhardwaj also uses computer simulations to test the vehicle’s control system and identify conditions under which it could fail. 

“I’ve learned about the culture of community and support at Johnson and NASA as a whole. Daniel made an effort to introduce me to the team and include me in conversations and meetings. I saw how team members step up to help one another and keep the whole unit moving forward,” Bhardwaj said. 

Cohen, a Rice University alumnus with a master’s in mechanical engineering, began his NASA career as a flight operations intern in 2020. He later held internships in docking dynamics, propulsion systems, and GN&C analysis before joining Johnson as a full-time engineer in August 2024. 

His current work includes developing simulations and models for studies of the U.S. Deorbit Vehicle, analyzing its control algorithms and GN&C performance, and evaluating SpaceX’s design at multiple life-cycle reviews.

He also analyzes settings for the Orion spacecraft’s docking camera, which provides positioning measurements that can help inform navigation during future Artemis rendezvous activities. 

Cohen supports Bhardwaj beyond her internship, giving her a closer look at how colleagues collaborate on projects and share ideas. He sets aside a couple of hours each week to teach interns topics such as orbital mechanics and control systems. 

Bhardwaj took Cohen’s advice to heart: How she spends her time and energy reflects what she values. She believes that her internship has shown her that problem-solving is rarely an individual effort. Team members bring different perspectives and need to understand how their work connects to a larger project. 

Working alongside interns in outreach, social media, and digital design has also broadened Bhardwaj’s view of STEM careers. “No matter what interests you, there’s likely a role for you here,” she said.  

She was proud to complete her first project, a set of analysis tools she built from scratch. Working through the debugging process and seeing a finished, functioning product was especially rewarding. 

Bhardwaj’s advice to students interested in NASA internships is to apply even if they do not feel fully prepared. 

“You’re probably never going to feel 100% ready, but so much of the learning happens on the job,” she said. “Trust in your ability to navigate new environments.” 

About the Author

Sumer Loggins

Sumer Loggins

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Last Updated
Oct 27, 2026

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