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Lunar Occultation of Mercury

Fans of the western sky after sunset have lately enjoyed this month's remarkable array of bright planets. Witnessed from some locations, on February 18 planet Mercury even appeared to slide behind the Moon, an event known as a lunar occultation. These two snapshots, taken in early evening skies show before and after telescopic views of the rare disappearance of innermost planet behind young Moon. The top panel finds bright Mercury just visible at the northern (right) edge of the earthshine-illuminated lunar disk. In the bottom panel the bright planet has emerged in darker skies beyond the Moon's sunlit crescent. As seen south of Sallisaw, Oklahoma, planet Earth, this lunar occultation of Mercury lasted only about 3 minutes ( video ). But you can still check out a parade of planets tonight . from NASA https://ift.tt/Mkel3r9

Sharpless 249 and the Jellyfish Nebula

Normally faint and elusive, the Jellyfish Nebula is caught in this alluring telescopic field of view . Floating in the interstellar sea, the nebula is anchored right and left by two bright stars, Mu and Eta Geminorum, at the foot of the celestial twins . The Jellyfish Nebula itself is right of center, seen as a brighter arcing ridge of emission with dangling tentacles. In fact, this cosmic jellyfish is part of bubble-shaped supernova remnant IC 443 , the expanding debris cloud from a massive star that exploded . Light from the explosion first reached planet Earth over 30,000 years ago. Like its cousin in astrophysical waters the Crab Nebula supernova remnant, the Jellyfish Nebula is known to harbor a neutron star, the ultradense remnant of the collapsed stellar core. An emission nebula cataloged as Sharpless 249 fills the field at the upper left. The Jellyfish Nebula is about 5,000 light-years away. At that distance, this image would be about 300 light-years across. from NASA...

Webb and Hubble: IC 5332

What does the universe look like through infrared goggles ? Our eyes can only see visible light , but astronomers want to see more. Today’s APOD shows spiral galaxy IC 5332 as seen by two NASA telescopes: Webb in mid- infrared and Hubble in ultraviolet and visible light. To toggle between the two space-based views just slide your cursor over the image (or follow this link ). The Hubble image highlights the spiral arms of the galaxy separated by dark regions, whereas the Webb image reveals a finer, more tangled structure. Interstellar dust scatters and absorbs light from the stars in the galaxy, causing the dark dust lanes in the Hubble image, and then emits heat in infrared light, so dust glows in this Webb image. The Mid-InfraRed Instrument on Webb needs to operate at a chilling temperature of -266ºC (or - 447ºF), otherwise it would detect infrared radiation from the telescope itself. Combining these observations, astronomers connect the “small scale” of gas and stars t...

Ever wonder what it would look like to crack open the Sun? The Egg Nebula , a dying Sun-like star , can unscramble this question. Pictured is a combination of several visible and infrared images of the nebula (also known as RAFGL 2688 or CRL 2688 ) taken with the Hubble Space Telescope . The star has shed its outer layers, and a bright, hot core (or "yolk") now illuminates the milky "egg white" shells of gas and dust surrounding the center. The central lobes and rings are structures of gas and dust recently ejected into space, with the dust being dense enough to block our view of the stellar core . Light beams emanate from that blocked core , escaping through holes carved in the older ejected material by newer, faster jets expelled from the star’s poles . Astronomers are still trying to figure out what causes the disks, lobes, and jets during this short (only a few thousand years!) phase of the star’s evolution , making this an egg-cellent image to study! ...

Look up this week and see a whole bunch of planets. Just after sunset, looking west (mostly), planets Mercury , Venus , Saturn , and Jupiter will all be visible to the unaided eye simultaneously. If you have a telescope, planets Uranus and Neptune can also be seen. In order up from the horizon, the lineup this week will be Venus (the brightest), Mercury , Saturn , Neptune, Uranus, and Jupiter (second brightest). It doesn't matter where on Earth you live because this early evening planet parade will be visible through clear skies all around the globe. The planets will appear to be nearly in a line because they all orbit the Sun in nearly the same plane: the ecliptic . The featured image shows a similar planet parade that occurred in 2022, captured over the Sydney Opera House in southern Australia . Although visible all week , the planets will be most easily seen together this weekend. from NASA https://ift.tt/A05tO4Q

Have you ever seen the Pleiades star cluster? Even if you have, you probably have never seen it as large and clear as this. Perhaps the most famous star cluster on the sky, the bright stars of the Pleiades can be seen with the unaided eye even from the depths of a light-polluted city . With a long exposure from a dark location, though, the dust cloud surrounding the Pleiades star cluster becomes very evident. The featured 18-hour exposure , taken from Bory Tucholskie , Poland covers a sky area several times the size of the full moon . Also known as the Seven Sisters and M45 , the Pleiades lies about 400 light years away toward the constellation of the Bull ( Taurus ). A common legend with a modern twist is that one of the brighter stars faded since the cluster was named, leaving only six of the sister stars visible to the unaided eye. The actual number of Pleiades stars visible, however, may be more or less than seven, depending on the darkness of the surrounding sky and t...

What if you saw your shadow on Mars and it wasn't human ? Then you might be the Opportunity rover exploring Mars. Opportunity explored the Red Planet from 2004 to 2018, finding evidence of ancient water , and sending breathtaking images across the inner Solar System . Pictured here in 2004, Opportunity looks opposite the Sun into Endurance Crater and sees its own shadow . Two wheels are visible on the lower left and right, while the floor and walls of the unusual crater are visible in the background. Caught in a dust storm in 2018 , Opportunity stopped responding, and NASA stopped trying to contact it in 2019 and declared the ground-breaking mission , originally planned for only 92 days, complete . from NASA https://ift.tt/KgYbCZ0

Twilight with Moon and Planets

Only two days after the February New Moon's annular eclipse of the Sun, a slender lunar crescent poses above the western horizon after sunset in this wintry twilight skyscape. Its nightside faintly illuminated by earthshine, the young Moon is joined by three bright planets in the mostly clear, early evening skies above the village of Kirazli, Turkiye. Inner planet Venus appears closest to the horizon. Near the beginning of its 2026 performance as planet Earth's evening star, brilliant Venus is seen through the warm sunset glare near picture center. Straight above Venus, innermost planet Mercury is easy to spot as it stands remarkably high above the horizon even as the twilight sky is growing dark. Outer planet Saturn , most distant of the naked-eye planets, is found just left of the Moon's sunlit crescent. from NASA https://ift.tt/rVQ48mX

"A ghost in the Milky Way…” says Christian Bertincourt, the astrophotographer behind this striking image of Barnard 93 (B93). The 93rd entry in Barnard’s Catalogue of Dark Nebula e, B93 lies within the Small Sagittarius Star Cloud ( Messier 24 ), where its darkness stands in stark contrast to bright stars and gas in the background. In some ways, B93 is really like a ghost , because it contains gas and dust that was dispersed by the deaths of stars , like supernovas . B93 appears as a dark void not because it is empty, but because its dust blocks the light emitted by more distant stars and glowing gas. Like other dark nebulas, some gas from B93 , if dense and massive enough, will eventually gravitationally condense to form new stars . If so, then once these stars ignite , B93 will transform from a dark ghost into a brilliant cradle of newborn stars. from NASA https://ift.tt/mOSVjbG

IC 2574: Coddington s Nebula

Grand spiral galaxies often seem to get all the glory, flaunting their young, bright, blue star clusters in beautiful, symmetric spiral arms. But small, irregular galaxies form stars too. In fact, dwarf galaxy IC 2574 shows clear evidence of intense star forming activity in its telltale reddish regions of glowing hydrogen gas. Just as in spiral galaxies, the turbulent star-forming regions in IC 2574 are churned by stellar winds and supernova explosions spewing material into the galaxy's interstellar medium and triggering further star formation. A mere 12 million light-years distant, IC 2574 is part of the M81 group of galaxies, seen toward the northern constellation Ursa Major. Also known as Coddington's Nebula, the faint but intriguing island universe is about 50,000 light-years across, discovered by American astronomer Edwin Coddington in 1898. from NASA https://ift.tt/udcMthG

Cradled in red-glowing hydrogen gas, stars are being born in Orion. These stellar nurseries lie at the edge of the giant Orion molecular cloud complex , some 1,500 light-years away. This detailed view spans about 12 degrees across the center of the well-known constellation, with the Great Orion Nebula , the closest large star -forming region, visible toward the lower right. The deep mosaic also includes, near the top center, the Flame Nebula and the Horsehead Nebula . Image data acquired with a hydrogen-alpha filter adds other remarkable features to this wide-angle cosmic vista: pervasive tendrils of energized atomic hydrogen gas and portions of the surrounding Barnard's Loop . While the Orion Nebula and many stars in Orion are easy to see with the unaided eye, emission from the extensive interstellar gas is faint and much harder to record , even in telescopic views of the nebula-rich complex. from NASA https://ift.tt/PBA0YeI

Some comets are regular guests of our solar neighborhood; others come by only once, never to return. We won’t have another chance to see Comet C/2024 E1 (Wierzchoś ), which is currently making its way through the inner Solar System . The hyperbolic orbit of this comet indicates that it will likely become an interstellar traveler. Comet Wierzchoś is today near its closest approach to the Earth, passing roughly the same distance from the Earth as is the Sun . The featured 30-minute exposure was taken last week in Chile and shows a 5-degree long ion tail as well as three shorter dust tails . The green hue of the coma comes from the breakdown of dicarbon molecules by sunlight, but that process does not last long enough to also tinge the tails . On the far right lies a spiral galaxy far in the distance: NGC 300 . from NASA https://ift.tt/aXiwNK5

How is RXJ0528+2838 creating such shock waves? A recently discovered white dwarf star , the farther left of the two largest white spots, RXJ0528+2838 , was found 730 light-years away from Earth . Most stars, when done fusing nuclei in their cores for energy, become red giant stars, the cores of which live on as faint dense white dwarfs that slowly cool down for the rest of time. White dwarfs are so dense that the only thing that stops them from collapsing further is quantum mechanics . In about 5 billion years, our Sun will become a white dwarf , too. The featured image , obtained with the European Southern Observatory ’s Very Large Telescope , shows unexplained bow shocks around RXJ0528+2838, similar to the bow wave of water around a fast-moving ship. Astronomers don’t yet know what is powering these shocks , which have existed for at least 1,000 years. The red, green and blue colors represent trace amounts of glowing hydrogen , nitrogen and oxygen gas. from NASA https:/...

What would it be like to fly free in space? About 100 meters from the cargo bay of a space shuttle , Bruce McCandless II was living the dream -- floating farther out than anyone had ever been before. Guided by a Manned Maneuvering Unit (MMU), astronaut McCandless, pictured , was floating free in space. During Space Shuttle mission 41-B in 1984, McCandless and fellow NASA astronaut Robert Stewart were the first to experience such an "un tether ed space walk ". The MMU worked by shooting jets of nitrogen and was used to help deploy and retrieve satellites . With a mass over 140 kilograms, an MMU is heavy on Earth , but, like everything, is weightless when drifting in orbit. The MMU was later replaced with the SAFER backpack propulsion unit. from NASA https://ift.tt/VwlHUOY

Roses are Red

Roses are red, nebulas are too, and this Valentine's gift is a stunning view! Pictured is a loving look at the Rosette Nebula ( NGC 2237 ): a cosmic bloom of bright young stars sitting atop a stem of glowing hot gas. The rose’s blue-white speckles are among the most luminous stars in the galaxy , with some burning millions of times brighter than the Sun. Their stellar winds sculpt the famed rose shape by pushing gas and dust away from the center. Though only a few million years old, these massive stars are already nearing the end of their lives , while dimmer stars embedded in the nebula will burn for billions of years to come. The vibrant red hue comes from hydrogen gas , ionized by the ultraviolet light from the young stars . The rose’s blue-white center is color-mapped to indicate the presence of similarly ionized oxygen. The Rosette Nebula reminds us of the beauty and transformation woven into the fabric of the universe. from NASA https://ift.tt/Uo6k2uy

NGC 147 and NGC 185

Dwarf galaxies NGC 147 (left) and NGC 185 stand side by side in this deep telescopic portrait. The two are not-often-imaged satellite galaxies of M31, the great spiral Andromeda Galaxy , some 2.5 million light-years away. Their separation on the sky, less than one degree across a pretty field of view toward the constellation Cassiopeia, translates to only about 35 thousand light-years at Andromeda's distance, but Andromeda itself is found well outside this frame. Brighter and more famous satellite galaxies of Andromeda, M32 and M110 , are seen much closer to the great spiral. NGC 147 and NGC 185 have been identified as binary galaxies, forming a gravitationally stable binary system. But recently discovered faint dwarf galaxy Cassiopeia II also seems to be part of their system, forming a gravitationally bound group within Andromeda's intriguing population of small satellite galaxies . from NASA https://ift.tt/HqDghxO

The Bay of Rainbows

Dark, smooth regions that cover the Moon's familiar face are called by Latin names for oceans and seas. That naming convention is historical , though it may seem a little ironic to denizens of the space age who recognize the Moon as a mostly dry and airless world, and the smooth, dark areas as lava-flooded impact basins. For example, this telescopic lunar vista, looks over the expanse of the northwestern Mare Imbrium, or Sea of Rains and into the Sinus Iridum, the Bay of Rainbows . Ringed by the Jura Mountains (montes) , the bay is about 250 kilometers across. Seen after local sunrise, the mountains form part of the Sinus Iridum impact crater wall. Their rugged sunlit arc is bounded at the top by Cape (promontorium) Laplace reaching nearly 3,000 meters above the bay's surface. At the bottom of the arc is Cape Heraclides, depicted by Giovanni Cassini in his 1679 telescope-based drawings mapping the moon as a moon maiden seen in profile with long, flowing hair . from NAS...

How many sunspots can you see? The central image shows the many sunspots that occurred in 2025, month by month around the circle, and all together in the grand central image. Each sunspot is magnetically cooled and so appears dark -- and can last from days to months. Although the featured images originated from NASA 's Solar Dynamics Observatory , sunspots can be easily seen with a small telescope or binoculars equipped with a solar filter . Very large sunspot groups like recent AR 4366 can even be seen with eclipse glasses . Sunspots are still counted by eye , but the total number is not considered exact because they frequently change and break up . Last year, 2025, coincided with a solar maximum , the period of most intense magnetic activity during its 11-year solar cycle . Our Sun remains unpredictable in many ways, including when it ejects solar flare s that will impact the Earth , and how active the next solar cycle will be. from NASA https://ift.tt/NUJc0gV

Raise your arms if you see an aurora. With those instructions, two nights went by with, well, clouds -- mostly. On the third night of returning to same peaks, though, the sky not only cleared up but lit up with a spectacular auroral display . Arms went high in the air, patience and experience paid off , and the creative featured image was captured as a composite from three separate exposures. The setting is a summit of the Austnesfjorden (a fjord ) close to the town of Svolvear on the Lofoten islands in northern Norway . The year was 2014. This year, our Sun is just passing solar maximum , the peak in its 11-year surface activity cycle . As expected, some spectacular auroras have recently resulted . from NASA https://ift.tt/oLfR8cW

What is Miranda really like? Visually, old image s from NASA's Voyager 2 have been recently combined and remastered to result in the featured image of Uranus 's 500-kilometer-wide moon. In the late 1980s, Voyager 2 flew by Uranus , coming close to the cratered, fractured, and unusually grooved moon -- named after a character from Shakespeare ’s The Tempest . Scientifically, planetary scientists are using old data and clear images to theorize anew about what shaped Miranda's severe surface features. A leading hypothesis is that Miranda , beneath its icy surface, may have once hosted an expansive liquid water ocean which may be slowly freezing. Thanks to the legacy of Voyager 2, Miranda has joined the ranks of Europa , Titan , and other icy moons in the search for water, and, possibly, microbial life , in our Solar System . from NASA https://ift.tt/2QYXUMz

An unusually active sunspot region is now crossing the Sun. The region, labelled AR 4366 , is much larger than the Earth and has produced several powerful solar flare s over the past ten days. In the featured image, the region is marked by large and dark sunspots toward the upper right of the Sun's disk. The image captured the Sun over a hill in Zacatecas , Mexico , 5 days ago. AR 4366 has become a candidate for the most active solar region in this entire 11-year solar cycle . Active solar regions are frequently associated with increased auroral activity on the Earth . Now reaching the edge, AR 4366 will begin facing away from the Earth during the coming week. It is not known , though, if the active region will survive long enough to reappear in about two weeks' time, as the Sun rotates . from NASA https://ift.tt/cipr0KB

Crescent Enceladus

Peering from the shadows, the Saturn-facing hemisphere of tantalizing inner moon Enceladus poses in this Cassini spacecraft image. North is up in the dramatic scene captured during November 2016 as Cassini's camera was pointed in a nearly sunward direction about 130,000 kilometers from the moon's bright crescent. In fact, the distant world reflects over 90 percent of the sunlight it receives, giving its surface about the same reflectivity as fresh snow . A mere 500 kilometers in diameter, Enceladus is a surprisingly active moon. Data and images collected during Cassini's flybys have revealed water vapor and ice grains spewing from south polar geysers and evidence of an ocean of liquid water hidden beneath the moon's icy crust. from NASA https://ift.tt/bRvlciT

Supernova Remnant Cassiopeia A

Massive stars in our Milky Way Galaxy live spectacular lives. Collapsing from vast cosmic clouds, their nuclear furnaces ignite and create heavy elements in their cores. After only a few million years for the most massive stars, the enriched material is blasted back into interstellar space where star formation can begin anew. The expanding debris cloud known as Cassiopeia A is an example of this final phase of the stellar life cycle . Light from the supernova explosion that created this remnant would have been first seen in planet Earth's sky about 350 years ago, although it took that light 11,000 years to reach us. This sharp NIRCam image from the James Webb Space Telescope shows the still-hot filaments and knots in the supernova remnant. The whitish, smoke-like outer shell of the expanding blast wave is about 20 light-years across. A series of light echoes from the massive star's cataclysmic explosion are also identified in Webb's detailed images of the surrounding ...

NGC 1275 in the Perseus Cluster

Active galaxy NGC 1275 is the central, dominant member of the large and relatively nearby Perseus Cluster of Galaxies . Wild-looking at visible wavelengths, the active galaxy is also a prodigious source of x-rays and radio emission. NGC 1275 accretes matter as entire galaxies fall into it, ultimately feeding a supermassive black hole at the galaxy's core. Narrowband image data used in this sharp telescopic image highlights the resulting galactic debris and filaments of glowing gas, some up to 20,000 light-years long. The filaments persist in NGC 1275, even though the turmoil of galactic collisions should destroy them. What keeps the filaments together? Observations indicate that the structures, pushed out from the galaxy's center by the black hole's activity, are held together by magnetic fields. Also known as Perseus A, NGC 1275 itself spans over 100,000 light years and lies about 230 million light years away. from NASA https://ift.tt/u3YPeCQ

Most galaxies don't have any rings -- why does this galaxy have three? To begin, a ring that's near NGC 1512 's center -- and so hard to see here -- is the nuclear ring which glows brightly with recently formed stars . Next out is a ring of stars and dust appearing both red and blue, called, counter-intuitively , the inner ring. This inner ring connects ends of a diffuse central bar of stars that runs horizontally across the galaxy. Farthest out in this wide field image is a ragged structure that might be considered an outer ring. This outer ring appears spiral-like and is dotted with clusters of bright blue stars. All these ring structures are thought to be affected by NGC 1512 's own gravitational asymmetries in a drawn-out process called secular evolution . The featured image was captured last month from a telescope at Deep Sky Chile in Chile . from NASA https://ift.tt/4JHkcGm

Oh what a tangled web a planetary nebula can weave. The Red Spider Planetary Nebula shows the complex structure that can result when a normal star ejects its outer gases and becomes a white dwarf star. Officially tagged NGC 6537 , this two-lobed symmetric planetary nebula houses one of the hottest white dwarfs ever observed, probably as part of a binary star system. Internal winds flowing out from the central stars, have been measured in excess of 1,000 kilometers per second. These winds expand the nebula, flow along the nebula's walls, and cause waves of hot gas and dust to collide. Atoms caught in these colliding shocks radiate light shown in the featured false-color infrared picture by the James Webb Space Telescope . The Red Spider Nebula lies toward the constellation of the Archer ( Sagittarius ). Its distance is not well known but has been estimated by some to be about 4,000 light-years . from NASA https://ift.tt/3ERPyIu

What part of Orion is this? Just north of the famous Orion Nebula is a picturesque star forming region in Orion's Sword that contains a lot of intricate dust -- some of which appears blue because it reflects the light of bright embedded stars . The region's popular name is the Running Man Nebula because, looked at from the right, part of the brown dust appears to be running legs. Cataloged as Sharpless 279 , the reflection nebula is not only part of the constellation of Orion , but part of the greater Orion molecular cloud complex . Light from the Running Man's bright stars, including 42 Orionis , the bright star closest to the featured image center, is slowly destroying and reshaping the surrounding dust, which will likely be completely gone in about 10 million years. The nebula spans about 15 light years and lies about 1,500 light years away. from NASA https://ift.tt/5rbxJAs

Mars has put on a happy face. The Martian crater Galle is famous because it has internal markings that make it look like a face that is both smiling and winking. These markings were originally discovered in the 1970s in pictures taken by the Viking Orbiter. The Mars Global Surveyor (MGS) spacecraft that orbited Mars from 1996 to 2006 captured the featured picture . Happy Face Crater and its iconic features were formed by chance billions of years ago when a city-sized asteroid slammed into the Martian surface. All rocky planets and moons in our Solar System show impact craters , with the highest number of craters found on Earth's Moon and the planet Mercury . Earth and Venus would show the most, though, were it not for weather and erosion . from NASA https://ift.tt/jikvqz7

Artemis I: Flight Day 13

On flight day 13 (November 28, 2022) of the Artemis 1 mission, the Orion spacecraft reached its maximum distance from Earth. At over 430,000 kilometers from Earth, its distant retrograde orbit also puts Orion nearly 70,000 kilometers from the Moon. In the same field of view in this video frame from flight day 13, planet and large natural satellite even appear about the same apparent size from the spacecraft's perspective. On flight day 26 (December 11, 2022), the uncrewed spacecraft splashed down on its home world concluding the historic Artemis I mission. The Artemis II mission , carrying 4 astronauts around the moon and back again, will launch no earlier than February 8. from NASA https://ift.tt/iE4q8vj

NGC 1333: Stellar Nursery in Perseus

NGC 1333 is seen in visible light as a reflection nebula , dominated by bluish hues characteristic of starlight reflected by interstellar dust. A mere 1,000 light-years distant toward the heroic constellation Perseus , it lies at the edge of a large, star-forming molecular cloud . This telescopic close-up spans over two full moons on the sky or just over 15 light-years at the estimated distance of NGC 1333. It shows details of the dusty region along with telltale hints of contrasty red emission from Herbig-Haro objects, jets and shocked glowing gas emanating from recently formed stars. In fact, NGC 1333 contains hundreds of stars less than a million years old, most still hidden from optical telescopes by the pervasive stardust . The chaotic environment may be similar to one in which our own Sun formed over 4.5 billion years ago. from NASA https://ift.tt/b2Z7j3P

NGC 2442: Galaxy in Volans

Distorted galaxy NGC 2442 can be found in the southern constellation of the flying fish, (Piscis) Volans . Located about 50 million light-years away, the galaxy's two spiral arms extending from a pronounced central bar give it a hook-shaped appearance in this deep and colorful image, with foreground stars scattered across the telescopic field of view. The image also reveals the distant galaxy's obscuring dust lanes, young blue star clusters and reddish star forming regions surrounding a core of yellowish light from an older population of stars. But the star forming regions seem more concentrated along the drawn-out (upper right) spiral arm. The distorted structure is likely the result of an ancient close encounter with a smaller galaxy that lies off top left of the frame. This telescopic field of view spans over 200,000 light-years at the estimated distance of NGC 2442. from NASA https://ift.tt/52YZxJv

In the vast Orion Molecular Cloud complex, several bright blue nebulas are particularly apparent. Pictured here in the center are two of the most prominent reflection nebulas - dust clouds lit by the reflecting light of bright embedded stars . The more famous nebula is M78 , in the image center, cataloged over 200 years ago. To its upper left is the lesser known NGC 2071 . Astronomers continue to study these reflection nebulas to better understand how interior stars form. The overall red glow is from diffuse hydrogen gas that covers much of the Orion complex that spans much of the constellation of Orion . Nearby in the greater complex , which lies about 1,500 light year s away, are the Orion Nebula , the Horsehead Nebula , and Barnard's Loop -- partially seen here as the white band on the upper left. from NASA https://ift.tt/jXFyVuc

Rising over a frozen valley in the Tatra Mountains , the familiar stars and nebulas of Orion dominate this wide-field nightscape. The featured deep photo was taken in southern Poland 's highest mountain range last month, where dark skies and alpine terrain combined to reveal both Earth's rugged beauty and the structure of our galaxy . Above the snowy mountains, Orion's bright belt stars anchor a region of glowing interstellar clouds. The Great Orion Nebula , a vast stellar nursery visible even to the unaided eye, shines near the center of the scene. Surrounding it is the enormous arc of Barnard's Loop , a faint shell of ionized hydrogen gas spanning much of the constellation . To the left, the round Rosette Nebula glows softly, while the grayish Witch Head Nebula hovers to the right, illuminated by nearby starlight. Near the top, the orange supergiant Betelgeuse marks the hunter's shoulder. from NASA https://ift.tt/JF0KdBc

Can you see nebulas in other galaxies? Yes, some nebulas shine brightly enough -- if you know how to look. Clouds of hydrogen and oxygen emit light at very specific colors, and by isolating them, astronomers and astrophotographers can reveal structures that would otherwise be too faint to notice. This deep, 50-hour exposure highlights glowing hydrogen (red) and oxygen (blue) across galaxy NGC 55 , viewed nearly edge-on . Also known as the String of Pearls Galaxy, NGC 55 is often compared to our Milky Way 's satellite galaxy the Large Magellanic Cloud (LMC), although NGC 55 lies much farther away at about 6.5 million light-years . The resulting image uncovers a sprinkling of emission nebula s within and sometimes above the galaxy's dusty disk , offering a detailed look at distant star -forming regions. from NASA https://ift.tt/jyUJ7ZW

This moon is doomed. Mars , the red planet named for the Roman god of war , has two tiny moons, Phobos and Deimos , whose names are derived from the Greek for Fear and Panic . These Martian moons may well be captured asteroids originating in the main asteroid belt between Mars and Jupiter or perhaps from even more distant reaches of our Solar System . The larger moon, Phobos , is indeed seen to be a cratered, asteroid-like object in this stunning color image from the robotic Mars Reconnaissance Orbiter , which can image objects as small as 10 meters. But Phobos orbits so close to Mars - about 5,800 kilometers above the surface compared to 400,000 kilometers for our Moon - that gravitational tidal forces are dragging it down. In perhaps 50 million years, Phobos is expected to disintegrate into a ring of debris. from NASA https://ift.tt/Nt3DBYS

Earthset from Orion

Eight billion people are about to disappear in this snapshot from space taken on 2022 November 21. On the sixth day of the Artemis I mission , their home world is setting behind the Moon's bright edge as viewed by an external camera on the outbound Orion spacecraft. Orion was headed for a powered flyby that took it to within 130 kilometers of the lunar surface. Velocity gained in the flyby maneuver was used to reach a distant retrograde orbit around the Moon. That orbit is considered distant because it's another 92,000 kilometers beyond the Moon, and retrograde because the spacecraft orbited in the opposite direction of the Moon's orbit around planet Earth. Swinging around the Moon , Orion reached a maximum distance (just over 400,000 kilometers) from Earth on 2022 November 28, exceeding a record set by Apollo 13 for most distant spacecraft designed for human space exploration . The Artemis II mission , carrying 4 astronauts around the moon and back again, is due to l...

Planetary Nebula Abell 7

Very faint planetary nebula Abell 7 is about 1,800 light-years distant. It lies just south of Orion in planet Earth's skies toward the constellation Lepus, The Hare . Posing with scattered Milky Way stars, its generally simple spherical shape about 8 light-years in diameter is revealed in this deep telescopic image. The beautiful and complex shapes seen within the cosmic cloud are visually enhanced by the use of long exposures and narrowband filters that capture emission from hydrogen and oxygen atoms. Otherwise Abell 7 would be much too faint to be appreciated by eye . A planetary nebula represents a very brief final phase in stellar evolution that our own Sun will experience 5 billion years hence , as the nebula's central, once sun-like star shrugs off its outer layers. Abell 7 itself is estimated to be 20,000 years old. But its central star, seen here as a fading white dwarf , is some 10 billion years old. from NASA https://ift.tt/Ohjc6ex

LDN 1622: Dark Nebula in Orion

The silhouette of an intriguing dark nebula inhabits this cosmic scene . Lynds' Dark Nebula ( LDN ) 1622 appears against a faint background of glowing hydrogen gas only visible in long telescopic exposures of the region. In contrast, a brighter reflection nebula, vdB 62, is more easily seen just above the dusty dark nebula. LDN 1622 lies near the plane of our Milky Way Galaxy, close on the sky to Barnard's Loop , a large cloud surrounding the rich complex of emission nebulae found in the Belt and Sword of Orion . With swept-back outlines, the obscuring dust of LDN 1622 is thought to lie at a similar distance, perhaps 1,500 light-years away. At that distance, this 3 degree wide field of view would span about 100 light-years. Young stars do lie hidden within the dark expanse and have been revealed in Spitzer Space telescope infrared images . Still, the foreboding visual appearance of LDN 1622 inspires its popular name, the Boogeyman Nebula . from NASA https://ift.tt/xU6Gct...

Barred Spiral Galaxy NGC 1365 from Webb

A mere 56 million light-years distant toward the southern constellation Fornax, NGC 1365 is an enormous barred spiral galaxy about 200,000 light-years in diameter. That's twice the size of our own barred spiral Milky Way. This sharp image from the James Webb Space Telescope 's Mid-Infrared Instrument (MIRI) reveals stunning details of this magnificent spiral in infrared light . Webb's field of view stretches about 60,000 light-years across NGC 1365, exploring the galaxy's core and bright newborn star clusters. The intricate network of dusty filaments and bubbles is created by young stars along spiral arms winding from the galaxy's central bar. Astronomers suspect the gravitational field of NGC 1365's bar plays a crucial role in the galaxy's evolution, funneling gas and dust into a star-forming maelstrom and ultimately feeding material into the active galaxy's central, supermassive black hole . from NASA https://ift.tt/hKA5tVp

The strangest moon in the Solar System is bright yellow. The featured picture , an attempt to show how Io would appear in the "true colors" perceptible to the average human eye, was taken in 1999 July by the Galileo spacecraft that orbited Jupiter from 1995 to 2003. Io's colors derive from sulfur and molten silicate rock . The unusual surface of Io is kept very young by its system of active volcanoes . The intense tidal gravity of Jupiter stretches Io and damps wobbles caused by Jupiter's other Galilean moons . The resulting friction greatly heats Io 's interior, causing molten rock to explode through the surface. Io's volcanoes are so active that they are effectively turning the whole moon inside out. Some of Io 's volcanic lava is so hot it glows in the dark . from NASA https://ift.tt/iq7juOn

What powers this unusual nebula? CTB 1 is the expanding gas shell that was left when a massive star toward the constellation of Cassiopeia exploded about 10,000 years ago. The star likely detonated when it ran out of elements, near its core, that could create stabilizing pressure with nuclear fusion . The resulting supernova remnant , nicknamed the Medulla Nebula for its brain-like shape , still glows in visible light because of the heat generated by its collision with confining interstellar gas . Why the nebula also glows in X-ray light , though, remains a topic of research . One hypothesis holds that an energetic pulsar was created and powers the nebula with a fast outwardly moving wind. Following this lead, a pulsar was found in radio waves that appears to have been expelled by the supernova explosion at over 1000 kilometers per second. Although the Medulla Nebula appears as large as a full moon , it is so faint that it took 84-hours of exposure with a small telescope in ...