Saturday, May 31, 2025

APOD - Afterimage Sunset

Astronomy Picture of the Day

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2025 May 31
See Explanation.  Clicking on the picture will download  the highest resolution version available.

Afterimage Sunset
Image Credit & Copyright: Marcella Giulia Pace

Explanation: On May 7, the Sun setting behind a church bell tower was captured in this filtered and manipulated digital skyscape from Ragusa, Sicily, planet Earth. In this version of the image the colors look bizarre. Still, an intriguing optical illusion known as an afterimage can help you experience the same scene with a more natural looking appearance. To try it, find the sunspots of active region AR4079 grouped near the bottom of the blue solar disk. Relax and stare at the dark sunspot group for about 30 seconds, then close your eyes or shift your gaze to a plain white surface. In a moment an afterimage of the sunset should faintly appear. But the afterimage sunset will have this image's complementary colors and a more normal yellow Sun against a familiar blue sky.

Tomorrow's picture: wildly interacting


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Friday, May 30, 2025

APOD - Mars in the Loop

Astronomy Picture of the Day

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2025 May 30
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Mars in the Loop
Image Credit & Copyright: Tunc Tezel (TWAN)

Explanation: This composite of images spaced a weather-permitting 5 to 9 days apart, from 2024 September 19 (top right) through 2025 May 18 (bottom left), faithfully traces ruddy-colored Mars as it makes a clockwise loop through the constellations Gemini and Cancer in planet Earth's night sky. You can connect the dots and dates with your cursor over the image, but be sure to check out this animation of the Red Planet's 2024/25 retrograde motion. Of course Mars didn't actually reverse the direction of its orbit. Instead, the apparent backwards motion with respect to the background stars is a reflection of the orbital motion of Earth itself. Retrograde motion can be seen each time Earth overtakes and laps planets orbiting farther from the Sun, the Earth moving more rapidly through its own relatively close-in orbit. In this case Mars' apparent eastward motion began to reverse around December 8, when it seemed to linger near open star cluster M44 in Cancer. After wandering back to the west, under Gemini's bright stars Castor and Pollux, Mars returned to pose near M44 by early May. At its brightest near opposition on 2025 January 16, Mars was a mere 96 million kilometers away.

Tomorrow's picture: afterimage


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Thursday, May 29, 2025

APOD - Irregular Dwarf Galaxy Sextans A

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2025 May 29
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Irregular Dwarf Galaxy Sextans A
Image Credit & Copyright: Franz Hofmann, Gemsbock Observatory

Explanation: Grand spiral galaxies often seem to get all the attention, flaunting young, bright, blue star clusters and pinkish star forming regions along graceful, symmetric spiral arms. But small galaxies form stars too, like irregular dwarf galaxy Sextans A. Its young star clusters and star forming regions are gathered into a gumdrop-shaped region a mere 5,000 light-years across. Seen toward the navigational constellation Sextans, the small galaxy lies some 4.5 million light-years distant. That puts it near the outskirts of the local group of galaxies, that includes the large, massive spirals Andromeda and our own Milky Way. Brighter Milky Way foreground stars appear spiky and yellowish in this colorful telescopic view of Sextans A.

Tomorrow's picture: Mars in the loop


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Wednesday, May 28, 2025

APOD - Herbig-Haro 24

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2025 May 28
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Herbig-Haro 24
Image Credit: NASA, ESA, Hubble Heritage (STScI / AURA) / Hubble-Europe Collaboration
Acknowledgment: D. Padgett (GSFC), T. Megeath (University of Toledo), B. Reipurth (University of Hawaii)

Explanation: This might look like a double-bladed lightsaber, but these two cosmic jets actually beam outward from a newborn star in a galaxy near you. Constructed from Hubble Space Telescope image data, the stunning scene spans about half a light-year across Herbig-Haro 24 (HH 24), some 1,300 light-years or 400 parsecs away in the stellar nurseries of the Orion B molecular cloud complex. Hidden from direct view, HH 24's central protostar is surrounded by cold dust and gas flattened into a rotating accretion disk. As material from the disk falls toward the young stellar object, it heats up. Opposing jets are blasted out along the system's rotation axis. Cutting through the region's interstellar matter, the narrow, energetic jets produce a series of glowing shock fronts along their path.

Tomorrow's picture: open space


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Tuesday, May 27, 2025

APOD - Zeta and Rho Ophiuchi with Milky Way

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2025 May 27
A very colorful sky field is shown featuring many stars and  nebulas that appear red, yellow, blue, and brown.   Please see the explanation for more detailed information.

Zeta and Rho Ophiuchi with Milky Way
Image Credit & Copyright: Ireneusz Nowak

Explanation: Behold one of the most photogenic regions of the night sky, captured impressively. Featured, the band of our Milky Way Galaxy runs diagonally along the bottom-left corner, while the colorful Rho Ophiuchi cloud complex is visible just right of center and the large red circular Zeta Ophiuchi Nebula appears near the top. In general, red emanates from nebulas glowing in the light of excited hydrogen gas, while blue marks interstellar dust preferentially reflecting the light of bright young stars. Thick dust usually appears dark brown. Many iconic objects of the night sky appear, including (can you find them?) the bright star Antares, the globular star cluster M4, and the Blue Horsehead nebula. This wide field composite, taken over 17 hours, was captured from South Africa last June.

Explore Your Universe: Random APOD Generator
Tomorrow's picture: powerful space jet


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Monday, May 26, 2025

APOD - Spiral Galaxy NGC 2566 from Webb

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2025 May 26
An oval galaxy is shown against a field of stars.  The outer rings shows many bright blue stars. In the   center is a bright nucleus with eight spikes jutting out.  Please see the explanation for more detailed information.

Spiral Galaxy NGC 2566 from Webb
Image Credit: ESA/Webb, NASA & CSA, A. Leroy

Explanation: What's happening in the center of spiral galaxy NGC 2566? First, the eight rays that appear to be coming out of the center in the featured infrared image are not real — they are diffraction spikes caused by the mechanical structure of the Webb space telescope itself. The center of NGC 2566 is bright but not considered unusual, which means that it likely contains a supermassive black hole, although currently not very active. At only 76 million light years away, the light we see from NGC 2566 today left when dinosaurs roamed the Earth. The picturesque galaxy is close enough so that Earthly telescopes, including Webb and Hubble, can resolve the turbulent clouds of gas and dust where stars can form and so allows study of stellar evolution. NGC 2566, similar in size to our Milky Way Galaxy, is notable for its bright central bar and its prominent outer spiral arms.

Tomorrow's picture: colorful star clouds


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Sunday, May 25, 2025

APOD - Beneath Jupiter

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2025 May 25
A close-up image is shown of the planet Jupiter.  Many clouds are visible including clouds colored blue  near the bottom, on the left, and white oval clouds  on the upper right.   Please see the explanation for more detailed information.

Beneath Jupiter
Image Credit & Copyright: NASA, Juno, SwRI, MSSS; Processing & License: Gerald Eichstädt & Seán Doran

Explanation: Jupiter is stranger than we knew. NASA's Juno spacecraft has now completed over 70 swoops past Jupiter as it moves around its highly elliptical orbit. Pictured from 2017, Jupiter is seen from below where, surprisingly, the horizontal bands that cover most of the planet disappear into swirls and complex patterns. A line of white oval clouds is visible nearer to the equator. Impressive results from Juno show that Jupiter's weather phenomena can extend deep below its cloud tops, that Jupiter's center has a core that is unexpectedly large and soft, and that Jupiter's magnetic field varies greatly with location. Although Juno is scheduled to keep orbiting Jupiter further into 2025, at some time the robotic spacecraft will be maneuvered to plunge into the giant planet.

Jigsaw Jumble: Astronomy Puzzle of the Day
Tomorrow's picture: galaxy spikes


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Saturday, May 24, 2025

APOD - Deimos Before Sunrise

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2025 May 24
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Deimos Before Sunrise
Image Credit: NASA, JPL-Caltech

Explanation: Deimos takes 30 hours and 18 minutes to complete one orbit around the Red Planet. That's a little more than one Martian day or sol which is about 24 hours and 40 minutes long, so Deimos drifts westward across the Martian sky. About 15 kilometers across at its widest, the smallest of Mars' two moons is bright though. In fact Deimos is the brightest celestial object in this Martian skyscape captured before sunrise by Perseverance on March 1, the 1,433rd sol of the Mars rover's mission. The image is a composed of 16 exposures recorded by one of the rover's navigation cameras. The individual exposures were combined into a single image for an enhanced low light view. Regulus and Algeiba, bright stars in the constellation Leo, are also visible in the dark Martian predawn sky.

Tomorrow's picture: beneath Jupiter


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Friday, May 23, 2025

APOD - NGC 6366 vs 47 Ophiuchi

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2025 May 23
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NGC 6366 vs 47 Ophiuchi
Image Credit & Copyright: Massimo Di Fusco

Explanation: Most globular star clusters roam the halo of our Milky Way galaxy, but globular cluster NGC 6366 lies close to the galactic plane. About 12,000 light-years away toward the constellation Ophiuchus, the cluster's starlight is dimmed and reddened by the Milky Way's interstellar dust when viewed from planet Earth. As a result, the stars of NGC 6366 look almost golden in this telescopic scene, especially when seen next to relatively bright, bluish, and nearby star 47 Ophiuchi. Compared to the hundred thousand stars or so gravitationally bound in distant NGC 6366, 47 Oph itself is a binary star system a mere 100 light-years away. Still, the co-orbiting stars of 47 Oph are too close together to be individually distinguished in the image.

Tomorrow's picture: Deimos before sunrise


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Thursday, May 22, 2025

APOD - Curly Spiral Galaxy M63

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2025 May 22
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Curly Spiral Galaxy M63
Image Credit & Copyright: Alberto Pisabarro

Explanation: A bright spiral galaxy of the northern sky, Messier 63 is nearby, about 30 million light-years distant toward the loyal constellation Canes Venatici. Also cataloged as NGC 5055, the majestic island universe is nearly 100,000 light-years across, about the size of our own Milky Way. Its bright core and majestic spiral arms lend the galaxy its popular name, The Sunflower Galaxy. This exceptionally deep exposure also follows faint loops and curling star streams far into the galaxy's halo. Extending nearly 180,000 light-years from the galactic center, the star streams are likely remnants of tidally disrupted satellites of M63. Other satellite galaxies of M63 can be spotted in the remarkable wide-field image, including dwarf galaxies, which could contribute to M63's star streams in the next few billion years.

Tomorrow's picture: pixels in space


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Wednesday, May 21, 2025

APOD - International Space Station Crosses the Sun

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2025 May 21
The Sun is pictured complete with active regions,  filaments, and prominences. Down the Sun's face is   a series of silhouettes that are the International   Space Station passing right in front.   Please see the explanation for more detailed information.

International Space Station Crosses the Sun
Image Credit & Copyright: Pau Montplet Sanz

Explanation: Typically, the International Space Station is visible only at night. Slowly drifting across the night sky as it orbits the Earth, the International Space Station (ISS) can be seen as a bright spot about once a month from many locations. The ISS is then visible only just after sunset or just before sunrise because it shines by reflected sunlight -- once the ISS enters the Earth's shadow, it will drop out of sight. The only occasion when the ISS is visible during the day is when it passes right in front of the Sun. Then, it passes so quickly that only cameras taking short exposures can visually freeze the ISS's silhouette onto the background Sun. The featured picture did exactly that -- it is actually a series of images taken a month ago from Sant Feliu de Buixalleu, Spain with perfect timing. This image series was later combined with a separate image highlighting the texture of the active Sun which included several Sun's prominences around the edge.

Celestial Surprise: What picture did APOD feature on your birthday? (post 1995)
Tomorrow's picture: pluto below


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Tuesday, May 20, 2025

APOD - Milky Way over Maunakea

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2025 May 20
A wide starfield is shown with the dark and light  band arching horizontally across the middle. On the right  is a colorful and complex nebula, and near the top   center is a red circular nebula.  Please see the explanation for more detailed information.

Milky Way over Maunakea
Image Credit & Copyright: Marzena Rogozinska

Explanation: Have you ever seen the band of our Milky Way Galaxy? In a clear sky from a dark location at the right time, a faint band of light becomes visible across the sky. Soon after your eyes become dark adapted, you might spot the band for the first time. It may then become obvious. Then spectacular. One reason for your growing astonishment might be the realization that this fuzzy swath, the Milky Way, contains billions of stars. Visible in the featured image, high above in the night sky, the band of the Milky Way Galaxy arcs. Also visible are the colorful clouds of Rho Ophiuchi on the right, and the red and circular Zeta Ophiuchi nebula near the top center. Taken in late February from Maunakea, Hawaii, USA, the foreground telescope is the University of Hawaii's 2.2-Meter Telescope. Fortunately, you don't need to be near the top of a Hawaiian volcano to see the Milky Way.

Put it All Together: Astronomy Puzzle of the Day
Tomorrow's picture: sun station


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Monday, May 19, 2025

APOD - Charon Flyover from New Horizons

Astronomy Picture of the Day

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2025 May 19

Charon Flyover from New Horizons
Video Credit: NASA, JHUAPL, SwRI, P. Schenk & J. Blackwell (LPI); Music: Juicy by ALBIS

Explanation: What if you could fly over Pluto's moon Charon -- what might you see? The New Horizons spacecraft did just this in 2015 July as it zipped past Pluto and Charon with cameras blazing. The images recorded allowed for a digital reconstruction of much of Charon's surface, further enabling the creation of fictitious flights over Charon created from this data. One such fanciful, minute-long, time-lapse video is shown here with vertical heights and colors of surface features digitally enhanced. Your journey begins over a wide chasm that divides different types of Charon's landscapes, a chasm that might have formed when Charon froze through. You soon turn north and fly over a colorful depression dubbed Mordor that, one hypothesis holds, is an unusual remnant from an ancient impact. Your voyage continues over an alien landscape rich with never-before-seen craters, mountains, and crevices. The robotic New Horizons spacecraft has too much momentum to ever return to Pluto and Charon and is now headed out of our Solar System.

Portal Universe: Random APOD Generator
Tomorrow's picture: volcano sky


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Sunday, May 18, 2025

APOD - Pluto Flyover from New Horizons

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2025 May 18

Pluto Flyover from New Horizons
Video Credit: NASA, JHUAPL, SwRI, P. Schenk & J. Blackwell (LPI); Music Open Sea Morning by Puddle of Infinity

Explanation: What if you could fly over Pluto -- what might you see? The New Horizons spacecraft did just this in 2015 July as it shot past the distant world at a speed of about 80,000 kilometers per hour. Images from this spectacular passage have been color enhanced, vertically scaled, and digitally combined into the featured two-minute time-lapse video. As your journey begins, light dawns on mountains thought to be composed of water ice but colored by frozen nitrogen. Soon, to your right, you see a flat sea of mostly solid nitrogen that has segmented into strange polygons that are thought to have bubbled up from a comparatively warm interior. Craters and ice mountains are common sights below. The video dims and ends over terrain dubbed bladed because it shows 500-meter high ridges separated by kilometer-sized gaps. The robotic New Horizons spacecraft has too much momentum to ever return to Pluto and is now headed out of our Solar System.

Tomorrow's picture: moon Charon


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Saturday, May 17, 2025

APOD - Ares 3 Landing Site: The Martian Revisited

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2025 May 17
See Explanation.  Clicking on the picture will download  the highest resolution version available.

Ares 3 Landing Site: The Martian Revisited
Image Credit: HiRISE, MRO, LPL (U. Arizona), NASA

Explanation: This close-up from the Mars Reconnaissance Orbiter's HiRISE camera shows weathered craters and windblown deposits in southern Acidalia Planitia. A striking shade of blue in standard HiRISE image colors, to the human eye the area would probably look grey or a little reddish. But human eyes have not gazed across this terrain, unless you count the eyes of NASA astronauts in the sci-fi novel, "The Martian," by Andy Weir. The novel chronicles the adventures of Mark Watney, an astronaut stranded at the fictional Mars mission Ares 3 landing site, corresponding to the coordinates of this cropped HiRISE frame. For scale, Watney's 6-meter-diameter habitat at the site would be about 1/10th the diameter of the large crater. Of course, the Ares 3 landing coordinates are only about 800 kilometers north of the (real life) Carl Sagan Memorial Station, the 1997 Pathfinder landing site.

Tomorrow's picture: fly over pluto


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Friday, May 16, 2025

APOD - Messier 101

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2025 May 16
See Explanation.  Clicking on the picture will download  the highest resolution version available.

Messier 101
Image Credit: NASA, ESA, CFHT, NOAO;
Acknowledgement - K.Kuntz (GSFC), F.Bresolin (U.Hawaii), J.Trauger (JPL), J.Mould (NOAO), Y.-H.Chu (U. Illinois)

Explanation: Big, beautiful spiral galaxy M101 is one of the last entries in Charles Messier's famous catalog, but definitely not one of the least. About 170,000 light-years across, this galaxy is enormous, almost twice the size of our own Milky Way. M101 was also one of the original spiral nebulae observed by Lord Rosse's large 19th century telescope, the Leviathan of Parsontown. Assembled from 51 exposures recorded by the Hubble Space Telescope in the 20th and 21st centuries, with additional data from ground based telescopes, this mosaic spans about 40,000 light-years across the central region of M101 in one of the highest definition spiral galaxy portraits ever released from Hubble. The sharp image shows stunning features of the galaxy's face-on disk of stars and dust along with background galaxies, some visible right through M101 itself. Also known as the Pinwheel Galaxy, M101 lies within the boundaries of the northern constellation Ursa Major, about 25 million light-years away.

Tomorrow's picture: (The) Martian landscape


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Thursday, May 15, 2025

APOD - A Plutonian Landscape

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2025 May 15
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A Plutonian Landscape
Image Credit: NASA, Johns Hopkins Univ./APL, Southwest Research Institute

Explanation: This shadowy landscape of majestic mountains and icy plains stretches toward the horizon on a small, distant world. It was captured from a range of about 18,000 kilometers when New Horizons looked back toward Pluto, 15 minutes after the spacecraft's closest approach on July 14, 2015. The dramatic, low-angle, near-twilight scene follows rugged mountains formally known as Norgay Montes from foreground left, and Hillary Montes along the horizon, giving way to smooth Sputnik Planum at right. Layers of Pluto's tenuous atmosphere are also revealed in the backlit view. With a strangely familiar appearance, the frigid terrain likely includes ices of nitrogen and carbon monoxide with water-ice mountains rising up to 3,500 meters (11,000 feet). That's comparable in height to the majestic mountains of planet Earth. The Plutonian landscape is 380 kilometers (230 miles) across.

Tomorrow's picture: pinwheel galaxy


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Wednesday, May 14, 2025

APOD - NGC 1360: The Robin's Egg Nebula

Astronomy Picture of the Day

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2025 May 14
A dark starfield highlights a blue and pink nebula  in its center. Some dark lanes of dust are seen inside  nebula's center.   Please see the explanation for more detailed information.

NGC 1360: The Robin's Egg Nebula
Image Credit & Copyright: Andrea Iorio, Vikas Chander & ShaRA Team

Explanation: This pretty nebula lies some 1,500 light-years away, its shape and color in this telescopic view reminiscent of a robin's egg. The cosmic cloud spans about 3 light-years, nestled securely within the boundaries of the southern constellation of the Furnace (Fornax). Recognized as a planetary nebula, egg-shaped NGC 1360 doesn't represent a beginning, though. Instead, it corresponds to a brief and final phase in the evolution of an aging star. In fact, visible at the center of the nebula, the central star of NGC 1360 is known to be a binary star system likely consisting of two evolved white dwarf stars, less massive but much hotter than the Sun. Their intense and otherwise invisible ultraviolet radiation has stripped away electrons from the atoms in their mutually surrounding gaseous shroud. The blue-green hue inside of NGC 1360 seen here is the strong emission produced as electrons recombine with doubly ionized oxygen atoms.

Celestial Surprise: What picture did APOD feature on your birthday? (post 1995)
Tomorrow's picture: pluto below


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Tuesday, May 13, 2025

APOD - Gaia Reconstructs a Top View of our Galaxy

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.

2025 May 13
A dark field surrounds a spiral galaxy with multiple arms.  Please see the explanation for more detailed information.

Gaia Reconstructs a Top View of our Galaxy
Illustration Credit: ESA, Gaia, DPAC, Stefan Payne-Wardenaar

Explanation: What does our Milky Way Galaxy look like from the top? Because we are on the inside, humanity can't get an actual picture. Recently, however, just such a map has been made using location data for over a billion stars from ESA's Gaia mission. The resulting featured illustration shows that just like many other spiral galaxies, our Milky Way has distinct spiral arms. Our Sun and most of the bright stars we see at night are in just one arm: Orion. Gaia data bolsters previous indications that our Milky Way has more than two spiral arms. Our Galaxy's center sports a prominent bar. The colors of our Galaxy's thin disk derive mostly from dark dust, bright blue stars, and red emission nebula. Although data analysis is ongoing, Gaia was deactivated in March after a succession mission.

Jigsaw Challenge: Astronomy Puzzle of the Day
Tomorrow's picture: big space egg


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Monday, May 12, 2025

APOD - Gaia Reconstructs a Side View of our Galaxy

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.

2025 May 12
A dark field of space surrounds a thin but  colorful band horizontally across the center.   The band is nearly straight but curves at its  outer edges.   Please see the explanation for more detailed information.

Gaia Reconstructs a Side View of our Galaxy
Illustration Credit: ESA, Gaia, DPAC, Stefan Payne-Wardenaar

Explanation: What does our Milky Way Galaxy look like from the side? Because we are on the inside, humanity can't get an actual picture. Recently, however, just such a map has been made using location data for over a billion stars from ESA's Gaia mission. The resulting featured illustration shows that just like many other spiral galaxies, our Milky Way has a very thin central disk. Our Sun and all the stars we see at night are in this disk. Although hypothesized before, perhaps more surprising is that the disk appears curved at the outer edges. The colors of our Galaxy's warped central band derive mostly from dark dust, bright blue stars, and red emission nebulas. Although data analysis is ongoing, Gaia was deactivated in March after a successful mission.

Explore Your Universe: Random APOD Generator
Tomorrow's picture: again from the top


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Sunday, May 11, 2025

APOD - The Surface of Venus from Venera 14

Astronomy Picture of the Day

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2025 May 11
A black & white image shows an empty flat landscape filled  with flattened rocks. At the bottom is part of the spacecraft  that captured this image of the planet Venus.  Please see the explanation for more detailed information.

The Surface of Venus from Venera 14
Image Credit: Soviet Planetary Exploration Program, Venera 14;
Processing & Copyright: Donald Mitchell & Michael Carroll (used with permission)

Explanation: If you could stand on Venus -- what would you see? Pictured is the view from Venera 14, a robotic Soviet lander which parachuted and air-braked down through the thick Venusian atmosphere in March of 1982. The desolate landscape it saw included flat rocks, vast empty terrain, and a featureless sky above Phoebe Regio near Venus' equator. On the lower left is the spacecraft's penetrometer used to make scientific measurements, while the light piece on the right is part of an ejected lens-cap. Enduring temperatures near 450 degrees Celsius and pressures 75 times that on Earth, the hardened Venera spacecraft lasted only about an hour. Although data from Venera 14 was beamed across the inner Solar System over 40 years ago, digital processing and merging of Venera's unusual images continues even today. Recent analyses of infrared measurements taken by ESA's orbiting Venus Express spacecraft indicate that active volcanoes may currently exist on Venus.

Jigsaw Fun: Astronomy Puzzle of the Day
Tomorrow's picture: Milky Way side view


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NASA Web Privacy, Accessibility, Notices;
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