Astronomy Picture of the Day

The Pelican Nebula in Gas, Dust, and Stars
Image Credit & Copyright: Mark Killion

Explanation: The Pelican Nebula is slowly being transformed. IC 5070 (an official designation) is divided from the larger North America Nebula by a molecular cloud filled with dark dust. The deep featured picture from Utah, USA incorporates 25 hours of exposure and brings out great details of this filamentary dust. The Pelican Nebula receives much study because it is a particularly active mix of star formation and evolving gas clouds. The light from young energetic stars is slowly transforming the cold gas to hot gas, with the advancing boundary between the two, known as an ionization front, visible in bright orange on the upper right. Particularly dense tentacles of cold gas remain. Millions of years from now, the Pelican Nebula, bounded by dark nebula LDN 935, might no longer be known as the Pelican, as the balance and placement of stars and gas will surely leave something that appears completely different.

Tomorrow’s picture: geometric Saturn

Astronomy Picture of the Day

Chasing the Moon’s Shadow
Image Credit: NASA

Explanation: Chasing the shadow of a New Moon, NASA’s WB-57F high altitude research aircraft took to the skies off the coast of Iceland on August 12 to observe a total solar eclipse. At 50,000 feet the aircraft was piloted along the precisely determined path of totality to maximize its time in the Moon’s shadow. A suite of high-resolution cameras on board was able to record eclipse data from above the clouds, dust, and atmospheric water vapor that interfere with observations made closer to the ground. This view from the cockpit, taken from an inflight video, captures the solar corona emerging at the beginning of totality. The sky appears dark in the shadow of the Moon. Venus is shining left of center in the video frame, while Jupiter and Mercury are just visible to the right of the eclipsed Sun. But the sky is bright along the distant horizon below, beyond the reach of the Moon’s shadow.

Tomorrow’s picture: enhancing Pluto

Astronomy Picture of the Day

Nā ʻUhane Māhoe Huki Pū i ke Ola
Image Credit: International Gemini Observatory / NOIRLab/NSF/AURA
Image Processing: J. Miller & M. Rodriguez (International Gemini Observatory/NSF NOIRLab),
T.A. Rector (University of Alaska Anchorage/NSF NOIRLab), D. de Martin & M. Zamani (NSF NOIRLab)

Explanation: Nā ʻUhane Māhoe Huki Pū i ke Ola, is the Hawaiian name given to this image of a pair of spiral galaxies locked in a mutual gravitational embrace. Some 200 million light-years distant toward the high flying constellation Pegasus their spectacular, galactic scale merger is captured in sharp detail in the image from the 8.1 meter Gemini North telescope on Maunakea, Hawai‘i. The galaxy pair, known as NGC 7253 and Arp 278, was chosen as a target, researched, and given a Hawaiian name by high school students in the joint Gemini Observatory and University of Hawaiʻi Project Hōkūlani internship program. The name translates to “The Twin Spirits Pulling Together Creating Life”. That’s both culturally and astronomically appropriate for galaxy collisions that trigger a cosmic maelstrom of star formation from galactic reservoirs of elemental building blocks of life. These merging galaxies are found within a region of Pegasus identified as the Hawaiian navigational constellation Ka Lupe o Kawelo.

Tomorrow’s picture: chasing shadows

Astronomy Picture of the Day

The Eclipse and the Stork
Image Credit & Copyright: Włodzimierz Bubak
Text: Cecilia Chirenti (NASA GSFC, UMCP, CRESST II)

Explanation: How do animals react to a total solar eclipse? The featured image shows a stork roosting on her nest in Poland at a partial phase of the recent total solar eclipse. If you are lucky enough to experience a total eclipse somewhere quiet and close to nature, you may be able to notice unusual daytime animal behaviors. During totality, you may hear nighttime sounds like crickets and frogs and see fireflies. In the dark, most birds are quiet. Thinking that it is time to go to bed, ducks and other waterfowl prepare to sleep on one leg, with their heads turned around and their beaks tucked into their back feathers (they don’t really sleep with their heads tucked under one wing). When sunlight returns at the end of totality, songbirds greet the new “morning” with their dawn songs. The crickets and frogs go quiet again. Animals and people resume their lifes, only briefly disturbed by the chance alignment of our Sun and Moon.

Tomorrow’s picture: aloha

Astronomy Picture of the Day

Solar Eclipses and Culture
Image Credit & Copyright: Javier Castro
Text: Keighley Rockcliffe (NASA GSFC, UMBC CSST, CRESST II)

Explanation: Pretend you have never heard of a solar eclipse. The Sun’s behavior has been predictable your whole life. One day, you witness the sky transform as it does in today’s spliced image spanning two hours of the August 12, 2026 solar eclipse. The Sun disappears, leaving behind a bright, empty ring. What would you think had happened? Humans have interpreted eclipses in countless ways throughout history, embedding beliefs about connection, rebirth, or danger into culture. “Eclipse” comes from the Greek word “ékleipsis” meaning “abandonment”. In ancient Greece, the solar eclipse marked the anger of the gods and the Sun abandoning humanity. To the Diné people, this celestial alignment is a time of renewal. Out of respect and to avoid the danger of sunlight, the Diné stay inside until the Sun and Moon separate. The Batammariba people of Benin and Togo believe that the Sun and Moon fight during an eclipse, so the community encourages peace among themselves. Eclipses are an example of the longstanding connection between astronomy and society.

Tomorrow’s picture: empty space

Astronomy Picture of the Day

Launch of the Roman Space Telescope
Video Credit: NASA

Explanation: A new telescope has been launched into space to study the universe. The Nancy Grace Roman Space Telescope (RST) has the same size main mirror as the Hubble Space Telescope (HST) but sees 100 times more sky during each snapshot. This is possible because when compared to HST, RST’s main mirror is more curved, its secondary mirror is closer, and its main camera is larger. The result is that RST can inspect more of the sky more quickly, likely allowing, among other capabilities, the discovery of many more supernovas which tell us more about the expansion rate and composition of our universe, and many more planets orbiting other stars that tell us more about the possibilities for life elsewhere in the universe. RST will orbit the Sun, not the Earth, like the James Webb Space Telescope. The featured video shows Roman being launched yesterday from Kennedy Space Center, Florida, USA aboard a SpaceX Falcon Heavy rocket.

Tomorrow’s picture: eclipse flight

Astronomy Picture of the Day

M74: A Grand Design Spiral
Image Credit: NASA, ESA, and the Hubble Heritage (STScI / AURA)- ESA / Hubble Collaboration
Acknowledgment: R. Chandar (U. Toledo) & J. Miller (U. Michigan)

Explanation: If not the most grand, then this spiral galaxy is at least one of the most photogenic. An island universe of about 100 billion stars, 32 million light-years away toward the constellation Pisces, M74 presents a gorgeous face-on view. Classified as an Sc galaxy, the grand design of M74’s graceful spiral arms are traced by bright blue star clusters and dark cosmic dust lanes. Constructed from archival images, this sharp composite is from the Hubble Space Telescope. Spanning about 30,000 light-years across the face of M74, it includes exposures recording emission from hydrogen atoms, highlighting the reddish glow of the galaxy’s large star-forming regions.

Tomorrow’s picture: eclipse flight

Astronomy Picture of the Day

Eclipse Pair
Image Credit & Copyright: Gwenaël Blanck

Explanation: Eclipses tend to come in pairs. Twice a year, during an eclipse season that lasts about 34 days, Sun, Moon, and Earth can nearly align. Then the new and full phases of the Moon, separated by just over 14 days, create a solar and a lunar eclipse. But only rarely is the alignment at both new moon and full moon during a single eclipse season close enough to produce a pair with both total solar and lunar eclipses. More often, partial eclipses are part of any eclipse season. But, the last eclipse season of 2026 did produce this fortnight-separated pairing of a total solar eclipse on August 12 (top) and an almost total lunar eclipse on the night of August 27/28. At New Moon, the solar eclipse was captured at Peñafiel, Spain near the begining of totality in this HDR composite image, revealing a flash of Bailey’s beads and a golden solar corona. At the following Full Moon, the deep partial lunar eclipse was recorded from Sèvres, France. Also an HDR composite, the image shows this partial eclipse at closer to half its 93 percent maximum phase, so about half the visible lunar disk appears darkened and reddened within Earth’s umbral shadow. The coming eclipse season will see an annular solar eclipse on 2027 February 6 paired with a penumbral lunar eclipse on February 20/21.

Tomorrow’s picture: a grand design

Astronomy Picture of the Day

Colorful Aurora over Icelandic Waterfall
Image Credit & Copyright: Victor Lima
Text: Cecilia Chirenti (NASA GSFC, UMCP, CRESST II)

Explanation: What a sight to behold, when a night sky became filled with colors that appeared to rain over the Skógafoss waterfall in Iceland. This image was taken in a single 5 second exposure by the photographer in April 2025. Seeing an aurora is on many people’s bucket lists. But it is not easy. It requires high solar activity, dark and clear skies, and usually a viewing location at high latitude. That makes the northern lights more easily seen than the corresponding southern lights, simply because there is less landmass in the Southern Hemisphere, especially around the Antarctic Circle. Auroras are caused by charged particles from the solar wind that are captured by the Earth’s magnetosphere and guided by the magnetic field to a region close to one of the poles, where they collide with gas particles in the atmosphere. Different colors indicate interactions with different gases at different altitudes, like oxygen (red and green) and nitrogen (blue and pink).

Tomorrow’s picture: What’s next?

Astronomy Picture of the Day

JWST Images The Lion’s Head Nebula
Image Credit: NASA, ESA, CSA, STScI; Image Processing: Alyssa Pagan (STScI)
Text: Keighley Rockcliffe (NASA GSFC, UMBC CSST, CRESST II)

Explanation: Are we looking at the future of our Sun? The James Webb Space Telescope captured today’s composite image of the Lion’s Head Nebula (NGC 2392) with its NIRCam and MIRI instruments. The Lion’s Head Nebula is the remnant of a Sun-like star. This star was unable to sustain the nuclear fusion in its core needed to remain stable. It began to shed layers of gas and dust into space, forming this planetary nebula. A hot stellar core, called a white dwarf, is left behind within the lion’s nose. Do not boop this nose! Intense radiation from the white dwarf is ionizing the gas as it expands, creating the irregular bubble that makes up the lion’s face. Dust clumps that have survived the white dwarf’s radiation and a cloud of ionized gas make up the lion’s mane. This new and more detailed view of the nebula will help humanity learn more about how the gas and dust interact with each other and the white dwarf radiation.

Tomorrow’s picture: a waterfall of light