APOD: 2026 October 13 – Desert Stairway to Heaven

APOD: 2026 October 13 – Desert Stairway to Heaven

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.

The Milky Way galaxy rises from the horizon and curves upward in the sky. In the foreground, a rock pathway is seen that culminates in a staircase that ends abruptly. The Milky Way band appears to be a continuation of the staircase. Please see the explanation for more detailed information.The Milky Way galaxy rises from the horizon and curves upward in the sky. In the foreground, a rock pathway is seen that culminates in a staircase that ends abruptly. The Milky Way band appears to be a continuation of the staircase. Please see the explanation for more detailed information.

Desert Stairway to Heaven

Explanation: This stairway in Chile brings you only a little bit closer to heaven. But ooh, the sky above it makes you wonder. For example, you may wonder about the dark lane of our own Milky Way galaxy rising behind the expansive Atacama Desert in Chile, the band of zodiacal light on the upper left, the green and red airglow just above the horizon, the star Spica in the zodiacal light stripe, and, at the very top on the right, the Small Magellanic Cloud galaxy. The Desert Staircase sculpture is in the foreground, and this image was timed to catch the picturesque peering perch just in front of the near-vertical Milky Way band. Upon close inspection of the horizon you can find, left to right, some Andes Mountains, the Licancabur volcano, and the town lights of San Pedro de Atacama. The featured wide-angle composite was captured in July 2025.

Tomorrow’s picture: open space

Date October 13, 2026
Credit & Copyright Julien Looten
Authors & editors: Robert Nemiroff, Jerry Bonnell, Cecilia Chirenti, Keighley Rockcliffe
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.

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An Impact Structure With Legs

An Impact Structure With Legs

Several short, light-colored rocky ridges radiate out from a central point amid an orange and tan desert landscape.

Editor’s Note: Today’s story is the answer to the October Puzzler.

From above, the mere appearance of a curious geologic feature in Western Australia is enough to cause a fright. The aptly named Spider Crater, the product of a meteorite impact followed by hundreds of millions of years of erosion, sprawls across the landscape in the country’s Kimberley region.

The OLI (Operational Land Imager) on the NASA-USGS Landsat 9 satellite captured this image of the crater on September 20, 2026. The full impact structure has an oval shape measuring about 13 kilometers by 11 kilometers (8 miles by 7 miles), with the spiderlike central portion measuring about 4 kilometers (2.5 miles) across.

Geologists believe the unusual arachnoid pattern is the remnant of a central uplift, the raised portion of the crater floor that formed in the rebound of the initial impact shock. The light-colored “legs” are sandstone ridges that have endured while other rock layers in the impact zone have eroded away.

For decades after the feature’s discovery, scientists struggled to weave a tale about its formation. Some proposed it had a volcanic past. But with some legwork in the field, geologists identified telltale signs of a past impact: fan-shaped fractures called shatter cones. These fractures form only when intense shock waves travel through rock, and they are ubiquitous in Spider Crater’s central dome.

Scientists have subsequently performed lab analyses of shocked quartz and zircon crystals from the sandstone, which can help them reconstruct the angle of the meteorite’s impact. The date of the impact is uncertain, but estimates based on rocks in the region place it between about 900 million and 600 million years ago—making Spider Crater a creature of the late Precambrian.

NASA Earth Observatory image by Michala Garrison, using Landsat data from the U.S. Geological Survey. Story by Lindsey Doermann.

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NASA’s SpaceX CRS-35 Mission to Launch Health Research

NASA’s SpaceX CRS-35 Mission to Launch Health Research

NASA experiments focused on human and plant health and drug-resistant organisms will travel to the International Space Station aboard SpaceX’s 35th Commercial Resupply Services mission for the agency from Cape Canaveral Space Force Station in Florida, advancing research that benefits life on Earth and future exploration.

This research supports astronaut health during long-duration missions through four investigations from the agency’s Biological and Physical Sciences division, including 3D models of the human brain, a crop disease study, a faster way to assess astronaut health, and an analysis of antibiotic-resistant bacteria aboard the space station.

Tiny brain models, big questions

A new precision health investigation helps address a key question: What happens to the human brain in space?

The experiment sends small, lab-grown models of the human brain to the orbiting laboratory for five weeks. Researchers compare tissue models that traveled to space with identical ones kept on Earth to determine how a short spaceflight affects the human brain at the cellular level.

The effort could deepen our understanding of how the human brain responds to stress and help lay the groundwork for methods that counter risks to brain health that astronauts may face on future missions to the Moon and beyond.

Disease-resistant crops for space

A space crops investigation tests whether crop diseases develop faster and more severely in microgravity.

The experiment compares molecular and structural changes between Earth-grown and space station-grown plants infected with a disease-causing fungus. The findings could guide plant breeding on Earth to produce disease-resistant crops and help minimize yield losses in future space agriculture systems.

Space crops provide nutrition, increase dietary variety, and offer psychological benefits for astronauts during extended missions. They also absorb carbon dioxide, produce oxygen, and recycle water, which will become increasingly important as human missions extend farther from Earth.

Analysis helps astronauts thrive

The spacecraft also carries the first test of a compact microplate reader that arrived aboard the space station earlier this year.

The Commercially Enabled Rapid Space Science initiative experiment tests the device’s ability to detect and measure certain biomarkers such as antibodies, antigens, and proteins.

Use of the plate reader would allow scientists to analyze samples aboard the space station and obtain data quickly, rather than wait for the samples to return to Earth for analysis.

Ultimately, the research aims to support the timely detection of infections and other health issues in astronauts while expanding science capabilities in remote exploration locations where resupply will be more difficult.

Tracking antibiotic-resistant bacteria

A precision health investigation returns for its fourth and final planned stay aboard the space station to study how antibiotic-resistant bacteria survive and evolve in microgravity.

As part of the investigation, astronauts repeatedly sample surfaces throughout the space station to monitor for drug-resistant organisms.

The work could help develop ways to protect astronauts against bacterial infections during long-duration missions. On Earth, the findings could provide insight into how superbugs develop from the overuse of antibiotics.

To learn more about NASA’s biological and physical research in space, visit: https://science.nasa.gov/biological-physical/

Biological & Physical Sciences Division

  • NASA’s Biological and Physical Sciences Division pioneers scientific discovery and enables exploration by using space environments to conduct investigations not possible on Earth. Studying biological and physical phenomena under extreme conditions allows researchers to advance the fundamental scientific knowledge required to go farther and stay longer in space, while also benefitting life on Earth.

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APOD: 2026 October 12 – Jupiter and the Moons

APOD: 2026 October 12 – Jupiter and the Moons

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.

In front of a dark background an image of Earth's Moon  appears with a lower crescent brightly lit. The rest of the Moon is also faintly visible. Above the Moon is a bright point of  light surrounded by four fainter points of light in row. Please see the explanation for more detailed information.

Jupiter and the Moons

Explanation: How many moons can you see? The best answer is five: four orbiting Jupiter and Luna orbiting Earth. This multi-moon picture was possible because Earth’s Moon moved directly in front of Jupiter last week. The featured image is a series of exposures near alignment taken from Westchester, New York, USA. The sunlit crescent of Earth’s Moon, on the lower left, is overexposed, while the Moon’s night side, on the upper right, is faintly illuminated by Earthshine. Lined up nearly vertically above our Moon, listed from bottom to top, are Jupiter’s bright Galilean satellites: Ganymede, Io, Callisto, and Europa. Callisto, Ganymede, and Io are larger than Earth’s Moon, while Europa is only slightly smaller. NASA’s robotic spacecraft Juno is currently orbiting Jupiter and has made close passes near three of these moons.

Tomorrow’s picture: stairway to heaven

Date: October 12, 2026
Credit & Copyright: Chirag Upreti
Authors & editors: Robert Nemiroff, Jerry Bonnell, Cecilia Chirenti, Keighley Rockcliffe
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.

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Antarctic Sea Ice Grows to Its 2026 Maximum

Antarctic Sea Ice Grows to Its 2026 Maximum

A map shows white Antarctic sea ice on September 14, 2026, the day it reached its annual maximum extent. The 1981–2010 median is outlined in yellow.
Antarctic sea ice reached its annual maximum extent on September 14, 2026—the third-lowest maximum in the satellite record.
NASA Earth Observatory/Michala Garrison

This story is an update to the Antarctic sea ice feature in our World of Change series tracking long-term change on Earth’s surface through satellite imagery.

Unlike the Arctic—an ocean basin surrounded by land—the Antarctic is a large continent surrounded by an ocean. Because of this geography, sea ice has more room to expand during the winter. However, that ice also stretches into warmer latitudes, leading to more melting in the summer. Antarctic sea ice usually peaks in September, around the end of the Southern Hemisphere’s winter, and retreats to a minimum in February.

According to NASA and the National Snow and Ice Data Center (NSIDC), Antarctic sea ice in 2026 likely reached its annual maximum extent on September 14 (above). On that date, the ice covered an estimated 17.59 million square kilometers (6.79 million square miles), making it the third-lowest maximum on record.

The maps below show the average concentration of Antarctic sea ice for the month of September (left) and the following February (right) from 1990 to 2026. Opaque white areas indicate the highest concentrations, and dark blue areas are open water. The images include only areas where ice concentration was at least 15 percent, a threshold scientists commonly use to count an area as ice-covered in satellite data. Scientists refer to the total area of these regions as the “sea ice extent.”

From Record Highs to Record Lows

From 1979 until 2014, total Antarctic sea ice increased by about 1 percent per decade. Whether the increase was a sign of meaningful change is uncertain because ice extents vary considerably from year to year around Antarctica. For three consecutive years, from 2012 to 2014, satellites observed new record highs for winter sea ice extent. These highs occurred while Arctic ice was in steep decline.

The climb came to an end in 2015, and significant decreases in sea ice around Antarctica started to occur in 2016. There have since been years with small rebounds, but overall, Antarctic sea ice coverage has largely remained lower than normal. Both the record low minimum and record low maximum occurred in 2023. Scientists will continue to observe the area each year to find out if the decline is part of a long-term change or a statistical fluctuation.

A line chart of Antarctic sea ice extent shows the 1981–2010 average as a blue dashed line, 2023 (the lowest minimum and lowest maximum on record) in orange, and 2026 in red.

Seeing Through the Clouds

To determine sea ice extent, scientists rely on satellites with passive microwave sensors that measure the microwave energy Earth naturally emits. Sea ice emits more of this energy than open water, so it stands out in microwave images. Because microwaves pass through clouds, the satellites can observe sea ice regularly, regardless of weather.

The record began in late 1978 with data collected by NASA’s Nimbus-7, followed by Defense Meteorological Satellite Program (DMSP) satellites starting in 1987, and by NASA’s Aqua satellite between 2002 and 2011. In 2025, scientists began using observations from the Japan Aerospace Exploration Agency’s GCOM-W satellite. 

NASA Earth Observatory images by Michala Garrison, using data from the National Snow and Ice Data Center.

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