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NASA’s Perseverance Rover Watches Earth Vanish Behind Martian Moon

2026-08-05 15:25

3 min read

Preparations for Next Moonwalk Simulations Underway (and Underwater)

Earth and the Martian moon Phobos dance together in a series of images recently acquired by NASA’s Perseverance Mars rover. Earth appears as a point of light in the Martian sky, disappearing behind the crescent of Phobos, the larger of Mars’ two moons.

This is the first time humanity has captured from the surface of another planet an observation of Earth disappearing behind an object.

The image sequence was taken by the rover’s Mastcam-Z instrument at about 7 p.m. local solar time (the Martian evening time where the rover is located) on July 2, the 1,907th Martian day, or sol, of the mission. In the composite image, Earth travels from the upper left of the frame toward the lower right while Phobos, moving from lower left to upper right, sweeps across its path. In the third frame of the sequence, the two meet, and our planet winks out behind the little moon’s shadowed edge.

“The composite image makes for a unique Earth self-portrait, taken from the surface of another planet, with a Phobos photobomb,” said Justin Maki, the Mastcam-Z deputy principal investigator and imaging scientist for Perseverance at NASA’s Jet Propulsion Laboratory in Southern California.

From where Perseverance sits on the rim of Mars’ Jezero Crater, the two objects could hardly look more different. Phobos, a lumpy, potato-shaped moon about 17 miles (27 kilometers) across at its widest, orbits so close to Mars (4,850 miles, or 7,800 kilometers, away) that when the images were taken, Phobos appears roughly one-third the width of Earth’s Moon as seen from our planet. Some 195 million miles (314 million kilometers) away at the time, Earth is reduced to a single, pixel-size dot.

“Phobos crosses the Martian sky three times a day, and Earth is visible for months at a stretch, but catching one directly behind the other takes planning and a little luck,” said Mark Lemmon, a Mastcam-Z co-investigator at the Space Science Institute in Boulder, Colorado, who planned the observation and assembled the composite.

A grainy black image showing a horizontal sequence of seven faint crescent shapes evenly spaced from left to right. A tiny bright white dot moves diagonally from the upper left to the lower right, appearing to pass behind the crescent shapes.
This composite of seven images of Earth passing behind the Martian moon Phobos was acquired from data taken on July 2, 2026, 1,907th Martian day, or sol, of the mission. The black background is the result of image processing that removed extraneous light in the background to enhance detail.
NASA/JPL-Caltech/ASU/MSSS/SSI

Transits, occultations, eclipses

Astronomers call the event captured in this observation an occultation: when a larger-appearing body completely blocks the one behind it from the viewer’s standpoint. By contrast, an eclipse occurs when one object moves into the shadow of another. When the Moon passes through Earth’s shadow, it’s called a lunar eclipse; when one object that appears to be the same size as another blocks it, like when the Moon passes before the Sun, it’s known as a solar eclipse.

When the roles are reversed, with a smaller-looking object crossing the face of a larger-looking one, astronomers call that a transit. Perseverance has observed those, too: when Phobos or Deimos crosses the disk of the Sun as seen from Mars. These are sometimes described informally as “Martian solar eclipses.”

More about Perseverance

NASA’s Jet Propulsion Laboratory in Southern California, which is managed by Caltech, built and manages operations of the Perseverance rover on behalf of the agency’s Science Mission Directorate in Washington, as part of NASA’s Mars Exploration Program portfolio. Arizona State University leads the operations of the rover’s Mastcam-Z instrument, working in collaboration with Malin Space Science Systems in San Diego, on the design, fabrication, testing, and operation of the cameras.

For more about Perseverance:

https://science.nasa.gov/mission/mars-2020-perseverance

News Media Contacts

DC Agle
 
Jet Propulsion Laboratory, Pasadena, Calif.
818-393-9011

agle@jpl.nasa.gov 

Karen Fox / Alana Johnson
NASA Headquarters, Washington 
240-285-5155 / 202-672-4780
karen.c.fox@nasa.gov / alana.r.johnson@nasa.gov 

2026-054

Advanced Mini-laboratories Automate Space Station Research

2026-08-05 14:00

2 Min Read

Advanced Mini-laboratories Automate Space Station Research

NASA astronaut and Expedition 71 Flight Engineer Tracy C. Dyson swaps out sample processors for the Pharmaceutical In-space Laboratory experiment that is exploring the production and manufacturing of medicines to benefit astronauts in space and humans on Earth. The processors were installed in the Advanced Space Experiment Processor, or ADSEP, that can process a variety of research samples and be delivered to the International Space Station and returned to Earth aboard the SpaceX Dragon cargo craft.
NASA astronaut Tracy C. Dyson swaps out sample processors in the Advanced Space Experiment Processor (ADSEP).
Credits: NASA

The International Space Station hosts hundreds of science experiments at a time. Some experiments can take hours to perform, and researchers need to account for astronauts’ limited time. Fully automated devices, like Redwire’s  ADvanced Space Experiment Processors (ADSEPs), have been designed to conduct more space science with less crew time.

Within each ADSEP facility there are three to four “mini-laboratories”, called cassettes, that allow multiple studies with different needs to be performed at the same time. The latest model, ADSEP-4 can accommodate four cassettes and features imagery capabilities. Since 2017, ADSEPs have conducted and supported two dozen investigations aboard space station with new ones on the horizon.

Close-up microscope image of transparent, hexagonal and cubic crystals against a warm orange-pink background.
Crystals are grown aboard the International Space Station as part of ADSEP-PIL-02, an investigation that aims to study the effects of microgravity on various types of crystals.
Redwire

The latest ADSEP investigations are related to growing seed crystals in space, which can be used to reformulate existing drugs or develop entirely new therapeutics. Previous experiments have shown that the unique microgravity environment allows the growth of larger and higher quality crystals. With Redwire’s Pharmaceutical In-Space Laboratory (PIL-BOX), a cassette-based system that uses the ADSEP facility, researchers can grow improved, space-grown seed crystals.

Adenot, wearing light blue polo shirt and black cargo pants, smiles as she holds a gray cassette the size of a lunchbox. The surrounding walls, ceiling, and floor are covered with cables, cameras, laptops, storage bags, and research equipment.
European Space Agency (ESA) astronaut Sophie Adenot displays a cassette for the ADvanced Space Experiment Processor (ADSEP).
NASA

Notable PIL-BOX experiments sponsored by the ISS National Laboratory have focused on cancer research. The ADSEP-PIL-10 investigation, currently being conducted in orbit in collaboration with the Aspera Biomedicines, works to crystallize cancer-blocking and cancer-promoting molecules with the goal of creating an oral cancer medication. ADSEP-PIL-15 crystalized cancer-treating medicines to help refine production, quality, and stability of these cancer drugs. A recent technology demonstration, ADSEP- ICC (Industrial Crystallization Cassette), tested a larger cassette to expand ADSEP function and scale crystallization production for commercial use.

Image of several juvenile bobtail squid suspended in water against a light background. The small, translucent squid have rounded, oblong bodies covered with tiny brown pigment spots and have tiny tentacles extending just below their round black eyes. Four squid are in the forefront in focus while several others are blurred in the background.
Juvenile bobtail squid swimming in seawater just after hatching as part of the ADSEP-UMAMI investigation.
University of Florida

ADSEPs are not limited to crystal growth and can also be used for culturing cells and tissues, studying organisms, and researching materials-sciences. In 2021, ADSEP-UMAMI studied how bobtail squid interacted with beneficial microbes in the space environment. This research found that symbiotic interactions with microbes can lessen a host animal’s stress responses caused by spaceflight and accelerate developmental pathways such as growing neurons and tissues. These findings give insight into the importance of symbiotic relationships in closed ecosystems like spacecraft and have implications for astronauts and their own beneficial bacteria during space missions.

The automation and versatility of ADSEPs permit a wide array of science experiments to be conducted aboard the orbiting laboratory, leading to findings that inform future space missions and are beneficial to people on Earth.

APOD: 2026 August 5 – Spokes on Saturn’s B Ring

2026-08-05 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.

A large gaseous planet surrounded by a large ring of material (actually multiple rings). The planet and its rings are rotating. A dark shadow appears at the left side of one of the rings and disappears after a short period of time.
Brad Croslin

Spokes on Saturn’s B Ring

Explanation: Don’t get spooked by Saturn’s ghostly spokes! Today we feature a nearly two-hour timelapse of Saturn and its rings looping forwards and backwards. A day on Saturn is only 10 hours long, so two hours of observation covers quite a bit of its rotation. If you look closely, a ghoulish shadow appears and disappears as Saturn’s B ring rotates. Decades of observation with Voyager 2Cassini, and Hubble show the appearance of Saturn’s spokes varies with the planet’s seasons. Like Earth, Saturn’s spin axis is tilted compared to the plane of its orbit around the Sun. During Saturn’s equinox, the rings are less tilted away from the Sun and the planet receives more evenly distributed sunlight and solar wind. Although their origin is still uncertain, Saturn’s spokes may be shadows of and reflections off of dust and ice levitating above the rings caused by electromagnetic interactions between the solar wind and the planet’s magnetic field.

Find dark skies and look up this August to witness the Perseid meteor shower uninhibited by the Moon!
Tomorrow’s picture: the COSMOS

Date: August 5, 2026
Credit & Copyright: Brad Croslin
Authors & editors: Robert Nemiroff, Jerry Bonnell, Cecilia Chirenti, Keighley Rockcliffe
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.
The Paradox of Lençóis Maranhenses National Park

2026-08-05 04:01

Bright white sand dunes stretch for dozens of kilometers between the dark blue Atlantic Ocean and green coastal vegetation. Blue and green freshwater lagoons fill low areas between the dunes, while dark-green vegetated patches lie within the dune field.
A mosaic of hundreds of freshwater lagoons partially filled the troughs around many of the park’s dunes when the OLI (Operational Land Imager) on Landsat 9 captured this image on June 8, 2026.
NASA Earth Observatory/Michala Garrison

The coastal dune system in Lençóis Maranhenses National Park in northeastern Brazil is among the most surreal landscapes on Earth. At first glance, the park looks like a desert, but it is far from it. This place receives about 125 centimeters (50 inches) of rain per year—slightly more than Seattle and double what falls in London. 

The result is a paradox: rows of sparkling white quartz dunes, some rising 30 meters (100 feet), soar over a mosaic of blue and green freshwater lagoons. The park’s name stems from the Portuguese word lençóis, meaning “bedsheets,” a reference that makes the most sense when the park is viewed from afar. From that perspective, the sweeping curves of the largest coastal dune field in South America resemble a rumpled, white bedsheet.

These Landsat 9 images were captured in June 2026, around the time when lagoon water levels typically peak. The partially impermeable layer of bedrock and clay beneath the sand prevents the lagoons from draining during the wet season. However, as rains subside between August and November, the water table falls, and by December, most of the lagoons dry up.

The various blue and greens of the lagoons are more visible in this view of a portion of the dune field. A small river with brown water is visible running northward through the dune field.
Winds blowing from the northeast created the lines of dunes visible in this detailed view of a portion of the Landsat 9 image shown above.
NASA Earth Observatory/Michala Garrison

The dune field, a tan area within an expanse of green, is the centerpiece of the park. It spans about 900 square kilometers (350 square miles), roughly the size of New York City. From above, shallower lagoons appear light blue, often taking on turquoise or aquamarine hues as sunlight reflects off the sand below. Deeper lagoons are darker, a result of the deeper water absorbing more red, yellow, and green wavelengths, leaving mostly blue light to scatter back. Suspended sediment, microscopic algae, and dissolved organic matter also contribute to the array of colors, giving some lagoons greener and browner tones.                                    

Green vegetation surrounds the dune field, which sits at the intersection of three Brazilian biomes: the Amazon rainforest to the west, the tropical wooded savannas of the Cerrado to the south, and the dry shrublands and thorn forests of the Caatinga to the east. Closest to the dunes are mangroves and restinga forests, ecosystems well adapted to sandy, coastal soils.

The dune field exists because of the rare convergence of geologic and climatic conditions. Rivers, including the Mearim and Parnaíba, deliver the key ingredient—quartz sand—to this unusually flat portion of the Maranhão coastline in massive quantities. It has accumulated here over the past few hundred thousand years driven in part by fluctuating sea levels and shoreline transgression and regression. Persistent easterly trade winds have also played a critical role. During the dry season, winds often reach at least 50 kilometers per hour, fast enough to build the dunes and push them westward at a pace of roughly 4 to 25 meters per year. That is fast for sand dunes, though not the fastest in the world. Satellites have tracked small barchan dunes in Namibia’s Sperrgebiet region moving at rates exceeding 80 meters per year.

Bright white sand dunes stretch for dozens of kilometers between the dark blue Atlantic Ocean and green coastal vegetation. Blue and green freshwater lagoons fill low areas between the dunes, while dark-green vegetated patches lie within the dune field.
NASA Earth Observatory/Michala Garrison

Landsat images, meanwhile, show the dune field at Lençóis Maranhenses has extended westward by about 0.5 kilometers between 1986 and 2026 in some areas due to the conveyor belt of dunes running inland from the coastline. The nearly constant movement of sand prevents vegetation from becoming established across much of the dune field.

UNESCO declared the park a World Heritage site in 2024, citing its remarkable geology and rich biodiversity. The park is home to more than 850 documented species, including fish, birds, reptiles, mammals, and phytoplankton. Among them are four endangered species, including the neotropical otter, West Indian manatee, scarlet ibis, and oncilla (a type of wild cat). Among the lagoons’ most remarkable inhabitants are the trahira (Hoplias malabaricus), a predatory fish species with large canine-like teeth. During the dry season, it burrows far enough under the sand to find damp mud, where it enters a dormant state, emerging after the rains to hunt insects and other fish.

NASA Earth Observatory images by Michala Garrison, using Landsat data from the U.S. Geological Survey. Story by Adam Voiland.

References & Resources

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

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Along the northeast side of the Capital Beltway in Maryland, green spaces weave through the developed landscape.

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NASA Will Attempt to Observe Rocket Part’s Lunar Impact

2026-08-04 20:00

The Moon's rugged surface is on display in this image. Most of the Moon is visible, with the bottom of the sphere disappearing into the darkness. This line between light and dark is called the terminator. The terminator is lined with many craters.
The Moon’s rocky, uneven, and otherworldly surface features are highlighted by the terminator – the difference between light and darkness.
NASA

Using ground-based telescopes and space-based assets, NASA and SpaceX are tracking a used Falcon 9 upper stage from a commercial mission expected to impact the Moon on Wednesday, Aug. 5, near the Einstein and Bell craters. The impact poses no danger to Earth and NASA scientists are planning to collect lunar data from the event and refine techniques for tracking objects in space. 

On Jan. 15, 2025, SpaceX launched the Falcon 9 rocket and successfully deployed Firefly Aerospace’s Blue Ghost 1 lunar lander to the Moon under NASA’s CLPS (Commercial Lunar Payload Services) initiative. Solar activity and gravitational forces caused the stage’s unplanned return to the Moon. NASA and SpaceX remain in communication about the upper stage and its flight path.

Independent astronomers first identified the trajectory using publicly available data. NASA’s Center for Near Earth Object Studies at the agency’s Jet Propulsion Laboratory in Southern California, which tracks natural objects that could pose hazards to Earth, later confirmed the stage has a 100% chance of impacting the Moon. NASA will continue tracking it as part of training operations.

Because the Moon has no atmosphere to slow incoming objects, it is struck by meteoroids daily. Human‑made object impacts are far less common but do occur. The rocket stage is expected to create a crater about 60 feet wide and 12 feet deep and throw dust and rock outward as ejecta. For comparison, a meteoroid with the same energy as the upper stage hits the Moon about every six days, so the lunar surface is constantly absorbing impacts with the same force. Despite the disturbance, observing impacts gives scientists valuable insight by revealing how ejecta plumes behave, helping to understand the Moon’s geology and refine models that guide future exploration and science missions.

The impact will not be visible to the naked eye on Earth, but NASA will attempt to observe it in real time. The Meteoroid Environments Office at the agency’s Marshall Space Flight Center in Huntsville, will use ground‑based telescopes to image the impact; however, weather and lighting conditions may make viewing difficult.

Additionally, NASA’s Lunar Reconnaissance Orbiter and the ShadowCam instrument aboard South Korea’s Korea Pathfinder Lunar Orbiter will look for chances to image the site before and after the impact. Image availability will depend on lighting, orbital timing, and spacecraft position, and it may take several days to receive imagery. Any data collected will help scientists better understand artificial impacts and their exploration implications.

Although unplanned in this instance, disposing of upper stages on the lunar surface is a technically accepted and safe method and, in some cases, can be the only practical option for missions in low lunar orbit. Many operators choose controlled impacts because they provide predictable and trackable end of life outcomes.

NASA is committed to debris mitigation and demonstrating responsible disposal practices that safeguard Earth, its orbital environment, and other planetary bodies while enabling discoveries that deepen our understanding of the solar system and benefit humanity.

TechCrunch - Latest

Meet the eight startups pitching at Startup Battlefield Australia

2026-08-05 17:02

The applications are in, and the TechCrunch Startup Battlefield team made their decisions!
PSA: Apple’s Private Relay can leak your real IP address

2026-08-05 16:52

A bug in how Apple implements its Private Relay feature, which in theory masks users’ IP addresses from the sites they visit, can reveal users’ real IP addresses.
Shopify says AI search is driving more traffic and sales, not replacing Google

2026-08-05 15:56

Shopify says AI isn’t cannibalizing search traffic the way it has for publishers. Instead, AI-driven traffic and orders to Shopify stores tripled year over year in Q2.
Hark previews its browser use agent for completing tasks

2026-08-05 15:46

Hark claims that its browser use agent is faster and cheaper than competition.
Zoox to start charging for robotaxi rides in Las Vegas

2026-08-05 15:06

This marks the official launch of Zoox's commercial operations.
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