Sharpless 308 now is sharp on this great photo by LAUBING:
Sharpless 308: Star Bubble Image Credit & Copyright: Laubing
Explanation: Blown by fast winds from a hot, massive star, this cosmic bubble is huge. Cataloged as Sharpless 2-308 it lies some 5,200 light-years away toward the constellation of the Big Dog (Canis Major) and covers slightly more of the sky than a Full Moon. That corresponds to a diameter of 60 light-years at its estimated distance. The massive star that created the bubble, a Wolf-Rayet star, is the bright one near the center of the nebula. Wolf-Rayet stars have over 20 times the mass of the Sun and are thought to be in a brief, pre-supernova phase of massive star evolution. Fast winds from this Wolf-Rayet star create the bubble-shaped nebula as they sweep up slower moving material from an earlier phase of evolution. The windblown nebula has an age of about 70,000 years. Relatively faint emission captured in the expansive image is dominated by the glow of ionized oxygen atoms mapped to a blue hue. SH2-308 is also known as The Dolphin Nebula.
So wide image, that I could not fit well as a simple overlay so only I post here:
Clouds of the Large Magellanic Cloud Image Credit & Copyright: Team Ciel Austral - J. C. Canonne, N. Outters, P. Bernhard, D. Chaplain, L. Bourgon ### FULL IMAGE ... The Large Magellanic Cloud (LMC) is an alluring sight in southern skies. But this deep and detailed telescopic view, over 10 months in the making, goes beyond what is visible to most circumnavigators of planet Earth. Spanning over 5 degrees or 10 full moons, the 4x4 panel mosaic was constructed from 3900 frames with a total of 1,060 hours of exposure time in both broadband and narrowband filters. The narrowband filters are designed to transmit only light emitted by sulfur, hydrogen, and oxygen atoms. Ionized by energetic starlight, the atoms emit their characteristic light as electrons are recaptured and the atoms transition to a lower energy state. As a result, in this image the LMC seems covered with its own clouds of ionized gas surrounding its massive, young stars. Sculpted by the strong stellar winds and ultraviolet radiation, the glowing clouds, dominated by emission from hydrogen, are known as H II (ionized hydrogen) regions. Itself composed of many overlapping H II regions, the Tarantula Nebula is the large star forming region at the left. The largest satellite of our Milky Way Galaxy, the LMC is about 15,000 light-years across and lies a mere 160,000 light-years away toward the constellation Dorado.
A Volcano of Fire under a Milky Way of Stars Image Credit & Copyright: Diego Rizzo
Explanation: Sometimes it's hard to decide which is more impressive -- the land or the sky. On the land of the featured image, for example, the Volcano of Fire (Volcán de Fuego) is seen erupting topped by red-hot, wind-blown ash and with streams of glowing lava running down its side. Lights from neighboring towns are seen through a thin haze below. In the sky, though, the central plane of our Milky Way Galaxy runs diagonally from the upper left, with a fleeting meteor just below, and the trail of a satellite to the upper right. The planet Jupiter also appears toward the upper left, with the bright star Antares just to its right. Much of the land and the sky were captured together in a single, well-timed, 25-second exposure taken in mid-April from the side of Fuego's sister volcano Acatenango in Guatemala. The image of the meteor, though, was captured in a similar frame taken about 30 minutes earlier -- when the volanic eruption was not as photogenic -- and added later digitally.
Have never posted such theme photo, now here one worth:
South Celestial Rocket Launch Image Credit & Copyright: Brendan Gully
At sunset on December 6 a Rocket Lab Electron rocket was launched from a rotating planet. With multiple small satellites on board it departed on a mission to low Earth orbit dubbed Running Out of Fingers from Mahia Peninsula on New Zealand's north island. The firey trace of the Electron's graceful launch arc is toward the south in this southern sea and skyscape. Drifting vapor trails and rocket exhaust plumes catch the sunlight even as the sky grows dark though, the setting Sun still shinning at altitude along the rocket's trajectory. Fixed to a tripod, the camera's perspective nearly aligns the peak of the rocket arc with the South Celestial Pole, but no bright star marks that location in the southern hemisphere's evening sky. Still, it's easy to find at the center of the star trail arcs in the timelapse composite.
Explanation: Some stars explode in slow motion. Rare, massive Wolf-Rayet stars are so tumultuous and hot that they are slowly disintegrating right before our telescopes. Glowing gas globs each typically over 30 times more massive than the Earth are being expelled by violent stellar winds. Wolf-Rayet star WR 124, visible near the featured image center spanning six light years across, is thus creating the surrounding nebula known as M1-67. Details of why this star has been slowly blowing itself apart over the past 20,000 years remains a topic of research. WR 124 lies 15,000 light-years away towards the constellation of the Arrow (Sagitta). The fate of any given Wolf-Rayet star likely depends on how massive it is, but many are thought to end their lives with spectacular explosions such as supernovas or gamma-ray bursts.
Some 20 years ago, in my twenties I had a bad dream about 95% of the world population dies in a misterious lung-disease. It was a terrible experience to see (and to know) that I will survive, but all who I love was about to die. Strange detail was in the dream, that as I fled a demolished and abandoned hospital section where I was searching for acquaintances, I clearly remember how surprised I was to see Andromeda galaxy on the evening sky in such detail...:
Now you know, why I have selected this handy-little shot into my collection of favorite astro-photos. ... BOO!!! ...(:
Andromeda Station Composite Image Credit & Copyright: Ralf Rohner
This surreal picture isn't from a special effects sci-fi movie. It is a digital composite of frames of the real Andromeda Galaxy, also known as M31, rising over a real mountain. Exposures tracking the galaxy and background stars have been digitally combined with separate exposures of the foreground terrain. All background and foreground exposures were made back to back with the same camera and telephoto lens on the same night from the same location. In the "Deepscape" combination they produce a stunning image that reveals a range of brightness and color that your eye can't quite see on its own. Still, it does look like you could ride a cable car up this mountain and get off at the station right next to Andromeda. But at 2.5 million light-years from Earth the big beautiful spiral galaxy really is a little out of reach as a destination. Don't worry, though. Just wait 5 billion years and the Andromeda Galaxy will come to you. This Andromeda Station is better known as Weisshorn, the highest peak of the ski area in Arosa, Switzerland.
analemma photo of the Moon by compatriot astrophotographer from the opening post:
Analemma of the Moon Image Credit & Copyright: György Soponyai # full image (hotlink)
Explanation: An analemma is that figure-8 curve you get when you mark the position of the Sun at the same time each day for one year. But the trick to imaging an analemma of the Moon is to wait bit longer. On average the Moon returns to the same position in the sky about 50 minutes and 29 seconds later each day. So photograph the Moon 50 minutes 29 seconds later on successive days. Over one lunation or lunar month it will trace out an analemma-like curve as the Moon's actual position wanders due to its tilted and elliptical orbit. To create this composite image of a lunar analemma, astronomer György Soponyai chose a lunar month from March 26 to April 18 with a good stretch of weather and a site close to home near Mogyorod, Hungary. Crescent lunar phases too thin and faint to capture around the New Moon are missing though. Facing southwest, the lights of Budapest are in the distance of the base image taken on March 27.
However quite a misterious and popular astronomical object, I hear the less about it. Venus - twin of Earth, only with a hell of heat and pressure on it's surface...
Phases of Venus Image Credit & Copyright: Richard Addis
Just as the Moon goes through phases, Venus' visible sunlit hemisphere waxes and wanes. This composite of backyard telescopic images illustrates the steady changes for Venus during its current stint as our evening star, as the inner planet grows larger but narrows to a thin crescent. Images from bottom to top were taken during 2020 on dates February 27, March 20, April 14, April 24, May 8, and May 14. Gliding along its interior orbit between Earth and Sun, Venus grows larger during that period because it is approaching planet Earth. Its crescent narrows, though, as Venus swings closer to our line-of-sight to the Sun. Closest to the Earth-Sun line but passing about 1/2 degree north of the Sun on June 3, Venus will reach a (non-judgmental) inferior conjunction. Soon after, Venus will shine clearly above the eastern horizon in predawn skies as planet Earth's morning star. After sunset tonight look for Venus above the western horizon and you can also spot elusive innermost planet Mercury.
Crescent Moon HDR Image Credit & Copyright: Miguel Claro (TWAN, Dark Sky Alqueva)
Explanation: How come the crescent Moon doesn't look like this? For one reason, because your eyes can't simultaneously discern bright and dark regions like this. Called earthshine or the da Vinci glow, the unlit part of a crescent Moon is visible but usually hard to see because it is much dimmer than the sunlit arc. In our digital age, however, the differences in brightness can be artificially reduced. The featured image is actually a digital composite of 15 short exposures of the bright crescent, and 14 longer exposures of the dim remainder. The origin of the da Vinci glow, as explained by Leonardo da Vinci about 510 years ago, is sunlight reflected first by the Earth to the Moon, and then back from the Moon to the Earth.
And as if spaceships would cruise upper layers of atmosphere on a gas-giant planet from an alien system...
Beguiling Bloom in The Baltic Sea August 15, 2020
Nearly every summer, colorful blooms of phytoplankton flourish in the Baltic Sea. And nearly every summer, satellite images detect art-like patterns as the phytoplankton trace the sea’s currents, eddies, and flows. But like the whorls of fingerprints, no two phytoplankton blooms are exactly alike.
... natural-color images, acquired on August 15, 2020, with the Operational Land Imager (OLI) on Landsat 8, show a late-summer phytoplankton bloom swirling in the Baltic Sea. The images feature part of a bloom located between Öland and Gotland, two islands off the coast of southeast Sweden. Note the dark, straight lines crossing the detailed image: these are the wakes of ships cutting through the bloom. ... The extent of this bloom spanned an area beyond the scope of these images; browse satellite images in Worldview to see it in context with the wider area. In some years, such as 2019, cyanobacteria blooms have covered as much as 200,000 square kilometers of the sea surface—slightly less than half the size of Sweden.
NASA Earth Observatory images by Joshua Stevens, using Landsat data from the U.S. Geological Survey. Story by Kathryn Hansen, with image interpretation by Norman Kuring/NASA GSFC, Ajit Subramaniam/LDEO/Columbia University, and Maren Voss/Leibniz Institute for Baltic Sea Research Warnemuende.
An astronaut aboard the International Space Station (ISS) took this photograph of storm clouds rising over Andros Island, one of the Bahama Islands. Even though the spacecraft was passing over southern Indiana (nearly 1800 kilometers/1100 miles north of Andros Island) at the time of the photo, the crew managed to shoot what seems like a close-up view by using a long lens (400 mm). They caught thunderstorms developing over the island, as well as features of the shallow sea floor known as the Great Bahama Bank.
Beyond the towering storms, the dull gray-brown pall of a dust plume is draped across the Caribbean Sea and Atlantic Ocean. The haze is so dense that it completely obscures the island of Cuba from the astronaut’s view. Two days after this photo was taken, people on the ground in Cuba saw the Sun significantly dimmed by the dusty haze.
This huge dust mass had been lofted ten days earlier from the vast sandy surfaces of the western Sahara Desert. The dust plume stretched across the Atlantic Ocean from northwestern Africa, a distance of more than 7000 kilometers (4,200 miles). Two days before this shot, an astronaut took an image of the same dust mass over the open ocean; the sea surface was completely obscured from view for hundreds of miles.
Scientists are keenly interested in Saharan dust plumes because they are known to depress hurricane development. The strong upper-level winds that can carry dust across great distances can also effectively shear off the tops of budding storms before they develop into hurricanes. The dry desert air also reduces the moisture content of the air it encounters over the open ocean. This reduces the airborne moisture that forms clouds and energizes hurricanes. This photo hints at this difference between these air masses: In contrast to the thunderstorms over tropical Andros Island, there is only a small cumulus cloud within the dust mass.
The dust event in June 2020 was among the thickest over the Atlantic Ocean since the year 2000, as revealed by this compilation of monthly dust and smoke loadings. In 1994 and 2001 astronauts took photographs of less dense Saharan dust plumes over the same region. --- Astronaut photograph ISS063-E-32223 was acquired on June 23, 2020, with a Nikon D5 digital camera using a 400 millimeter lens and is provided by the ISS Crew Earth Observations Facility and the Earth Science and Remote Sensing Unit, Johnson Space Center. The image was taken by a member of the Expedition 63 crew. The image has been cropped and enhanced to improve contrast, and lens artifacts have been removed. The International Space Station Program supports the laboratory as part of the ISS National Lab to help astronauts take pictures of Earth that will be of the greatest value to scientists and the public, and to make those images freely available on the Internet. Additional images taken by astronauts and cosmonauts can be viewed at the NASA/JSC Gateway to Astronaut Photography of Earth. Caption by Justin Wilkinson, Texas State University, JETS Contract.
Two examples of this phenomena already I have mentioned in this thread, but this one "puts some dots on some 'i'-s"...
Jupiter or Earth? Governed by the same laws of physics, very different planets display similar patterns. Image of the Day for March 11, 2019
Juno image - December 2018 Landsat 8 image - July 18, 2018
It’s reasonable to think that Jupiter—a gaseous planet more than 11 times the diameter of Earth—would have little in common with our home. But it turns out that the motion of fluids on both planets is governed by the same laws of physics. An eddy on Earth looks a lot like an eddy on Jupiter.
The similarities are especially evident in these images showing swirls in Jupiter’s atmosphere and in Earth’s Baltic Sea. “This is all about fluids moving around on a rotating body,” said Norman Kuring of NASA’s Goddard Space Flight Center. ...
Explanation: That's no sunspot. It's the International Space Station (ISS) caught passing in front of the Sun. Sunspots, individually, have a dark central umbra, a lighter surrounding penumbra, and no Dragon capsules attached. By contrast, the ISS is a complex and multi-spired mechanism, one of the largest and most complicated spacecraft ever created by humanity. Also, sunspots circle the Sun, whereas the ISS orbits the Earth. Transiting the Sun is not very unusual for the ISS, which orbits the Earth about every 90 minutes, but getting one's location, timing and equipment just right for a great image is rare. The featured picture combined three images all taken from the same location and at nearly the same time. One image -- overexposed -- captured the faint prominences seen across the top of the Sun, a second image -- underexposed -- captured the complex texture of the Sun's chromosphere, while the third image -- the hardest to get -- captured the space station as it shot across the Sun in a fraction of a second. Close inspection of the space station's silhouette even reveals a docked Dragon Crew capsule.
The Outburst Clouds of Star AG Car Image Credit: NASA, ESA, STScI; Processing: Judy Schmidt; Text: Anders Nyholm
Explanation: What created these unusual clouds? At the center of this 2021 Hubble image sits AG Carinae, a supergiant star located about 20,000 light-years away in the southern constellation Carina. The star's emitted power is over a million times that of the Sun, making AG Carinae one of the most luminous stars in our Milky Way galaxy. AG Carinae and its neighbor Eta Carinae belong to the scarce Luminous Blue Variable (LBV) class of stars, known for their rare but violent eruptions. The nebula that surrounds AG Car is interpreted as a remnant of one or more such outbursts. This nebula measures 5 light-years across, is estimated to contain about 10 solar masses of gas, and to be at least 10,000 years old. This Hubble image, taken to commemorate Hubble's 31st launch anniversary, is the first to capture the whole nebula, offering a new perspective on its structure and dust content. The LBVs represent a late and short stage in the lives of some supergiant stars, but explaining their restlessness remains a challenge to humanity's understanding of how massive stars work.
KitsuneFox: syzygy - posts I have made here do not receive much attention. I may do a detailed writeup of the now lost Edgemont Park in PA, one of the first electrified trolley parks in the world, but still debating. I'm missing 1 key bit of information.
Aug 17, 2021 10:38:20 GMT
syzygy: BRUTAL! Cars as if were matchboxes in a model town... Brilliant infos you share here in shoutbox - why not you post these?
Aug 16, 2021 17:36:00 GMT
KitsuneFox: In the early morning, before sunrise, of Augusts 11th, 12th, and 13th is reported to be the best viewing time for the Perseids meteor shower.
Aug 10, 2021 10:32:11 GMT
KitsuneFox: Davidson Seamount is the tallest known fully underwater mountain in the world, measuring 7,480 feet base to peak.
Aug 5, 2021 0:02:27 GMT
syzygy: ...and about other hills and humps... stone cold wisdom! ( :
Jul 28, 2021 14:13:17 GMT
KitsuneFox: Mount Wycheproof in Australia is the shortest recognized mountain on the world. It stands at 141 feet base to peak. A mineral named 'Wycheproofite' is mined near the location, and is the only known place it's found.
Jul 28, 2021 10:13:47 GMT
syzygy: Cool! Great extra info series about "all stars" highest mountains on Earth!
Jul 22, 2021 6:25:22 GMT
KitsuneFox: Mount Chimborazo in Ecuador is the highest mountain on Earth, as measured from the center of the planet. The peak is over 6,800 feet further away than Mount Everest, and is the closest land on earth to outer space.
Jul 22, 2021 0:13:35 GMT
SpiderX22: Big news in the Aircraft in Flight database (in Transportation) -> HUGE changes. Thanks RaveyThirteen for your post -> will be changing ownership of the collection (hopefully for me lol) -> look forward to this!
Jul 20, 2021 21:02:26 GMT