Monday, May 31, 2021
What are those streaks across Orion? Most are reflections of sunlight from numerous Earth-orbiting Starlink satellites. Appearing by eye as a series of successive points floating across a twilight sky, the increasing number of SpaceX Starlink communication satellites are causing concern among many astronomers. On the positive side, Starlink and similar constellations make the post-sunset sky more dynamic, satellite-based global communications faster, and help provide digital services to currently underserved rural areas. On the negative side, though, these low Earth-orbit satellites make some deep astronomical imaging programs more difficult, in particular observing programs that need images taken just after sunset and just before dawn. Planned future satellite arrays that function in higher orbits may impact investigations of the deep universe planned for large ground-based telescopes at any time during the night. The featured picture, taken in 2019 December, is a digital combination of over 65 3-minutes exposures, with some images taken to highlight the background Orion Nebula, while others to feature the passing satellites.
https://apod.nasa.gov/apod/ap210601.html ( June 01, 2021)
Sunday, May 30, 2021
Whatever hit Mimas nearly destroyed it. What remains is one of the largest impact craters on one of Saturn's smallest round moons. Analysis indicates that a slightly larger impact would have destroyed Mimas entirely. The huge crater, named Herschel after the 1789 discoverer of Mimas, Sir William Herschel, spans about 130 kilometers and is featured here. Mimas' low mass produces a surface gravity just strong enough to create a spherical body but weak enough to allow such relatively large surface features. Mimas is made of mostly water ice with a smattering of rock - so it is accurately described as a big dirty snowball. The featured image was taken during the closest-ever flyby of the robot spacecraft Cassini past Mimas in 2010 while in orbit around Saturn.
https://apod.nasa.gov/apod/ap210531.html ( May 31, 2021)
Saturday, May 29, 2021
Auroras usually occur high above the clouds. The auroral glow is created when fast-moving particles ejected from the Sun impact the Earth's magnetosphere, from which charged particles spiral along the Earth's magnetic field to strike atoms and molecules high in the Earth's atmosphere. An oxygen atom, for example, will glow in the green light commonly emitted by an aurora after being energized by such a collision. The lowest part of an aurora will typically occur about 100 kilometers up, while most clouds exist only below about 10 kilometers. The relative heights of clouds and auroras are shown clearly in the featured picture in 2015 from Dyrholaey, Iceland. There, a determined astrophotographer withstood high winds and initially overcast skies in an attempt to capture aurora over a picturesque lighthouse, only to take, by chance, the featured picture including elongated lenticular clouds, along the way.
https://apod.nasa.gov/apod/ap210530.html ( May 30, 2021)
Friday, May 28, 2021
Why is the Moon so dusty? On Earth, rocks are weathered by wind and water, creating soil and sand. On the Moon, the history of constant micrometeorite bombardment has blasted away at the rocky surface creating a layer of powdery lunar soil or regolith. For the Apollo astronauts and their equipment, the pervasive, fine, gritty dust was definitely a problem. On the lunar surface in December 1972, Apollo 17 astronauts Harrison Schmitt and Eugene Cernan needed to repair one of their rover's fenders in an effort to keep the rooster tails of dust away from themselves and their gear. This picture reveals the wheel and fender of their dust covered rover along with the ingenious application of spare maps, clamps, and a grey strip of "duct tape".
https://apod.nasa.gov/apod/ap210529.html ( May 29, 2021)
Payloads: A-HoSS (Artemis HERA on Space Station): The crew powered on the Adlink Mini PC for Artemis HERA (Hybrid Electronic Radiation Assessor on Space Station) radiation data gathering. Artemis HERA on Space Station (A-HoSS) demonstrates software to refine data analysis and operational products for future exploration missions. It modifies the Hybrid Electronic Radiation Assessor (HERA), … ...
May 27, 2021 at 12:00PM
From NASA: https://blogs.nasa.gov/stationreport/2021/05/27/iss-daily-summary-report-5-27-2021/
Thursday, May 27, 2021
The reddened shadow of planet Earth plays across the lunar disk in this telescopic image taken on May 26 near Sydney, New South Wales, Australia. On that crisp, clear autumn night a Perigee Full Moon slid through the northern edge of the shadow's dark central umbra. Short for a lunar eclipse, its total phase lasted only about 14 minutes. The Earth's shadow was not completely dark though. Instead it was suffused with a faint red light from all the planet's sunsets and sunrises seen from the perspective of an eclipsed Moon, the reddened sunlight scattered by Earth's atmosphere. The HDR composite of 6 exposures also shows the wide range of brightness variations within Earth's umbral shadow against a faint background of stars.
https://apod.nasa.gov/apod/ap210528.html ( May 28, 2021)
Threads of superheated gas and magnetic fields are weaving a tapestry of energy at the center of the Milky Way galaxy. A new image of this new cosmic masterpiece was made using a giant mosaic of data from NASA's Chandra X-ray Observatory and the MeerKAT radio telescope in South Africa.
from NASA http://www.nasa.gov/mission_pages/chandra/images/magnetized-threads-weave-spectacular-galactic-tapestry.html
Payloads: Astrobee: A crewmember prepared the Astrobee free flyers and the JEM Module for remote video capture and live stream operations. Astrobee is made up of three free-flying, cube-shaped robots which are designed to help scientists and engineers develop and test technologies for use in microgravity to assist astronauts with routine chores and give ground … ...
May 26, 2021 at 12:00PM
From NASA: https://blogs.nasa.gov/stationreport/2021/05/26/iss-daily-summary-report-5-26-2021/
Wednesday, May 26, 2021
May's perigee Full Moon slid through Earth's shadow yesterday entertaining night skygazers in regions around the Pacific. Seen from western North America, it sinks toward the rugged Sierra Nevada mountain range in this time-lapse series of the total lunar eclipse. Low on the western horizon the Moon was captured at mid-eclipse with two separate exposures. Combined they reveal the eclipsed Moon's reddened color against the dark night sky and the diffuse starlight band of the Milky Way. Frames taken every five minutes from the fixed camera follow the surrounding progression of the eclipse partial phases. In the foreground a radio telescope dish at California's Owen's Valley Radio Observatory points skyward.
https://apod.nasa.gov/apod/ap210527.html ( May 27, 2021)
Payloads: ACME (Advanced Combustion via Microgravity Experiments): A crewmember replaced CIR Manifold #4 with a new C4H10 (Butane) and C2H6 (Ethane) bottles and replaced O2 bottles in Manifold #2. The Advanced Combustion via Microgravity Experiments (ACME) project is a set of six independent studies of gaseous flames to be conducted in the Combustion Integrated Rack … ...
May 25, 2021 at 12:00PM
From NASA: https://blogs.nasa.gov/stationreport/2021/05/25/iss-daily-summary-report-5-25-2021/
In just over a week, these tiny squids will head to space along with many other scientific experiments aboard SpaceX’s 22nd cargo resupply mission to the station.
from NASA http://www.nasa.gov/image-feature/squids-and-other-research-heading-to-the-station-yes-squids
Tuesday, May 25, 2021
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.
https://apod.nasa.gov/apod/ap210526.html ( May 26, 2021)
Pauline Hwang is currently the Strategic Mission Manager for Mars 2020 Surface Operations.
from NASA http://www.nasa.gov/image-feature/mars-perseverance-surface-operations-manager-pauline-hwang
Payloads: CBEF-L (Cell Biology Experiment Facility-L): Today, Crew verified the cable connections and sensors for the 1G Centrifuge in preparation of future operations. CBEF-L is a Japan Aerospace Exploration Agency (JAXA) new subrack facility, which is an upgraded facility of the original Cell Biology Experiment Facility (CBEF) currently aboard the International Space Station (ISS). CBEF-L … ...
May 24, 2021 at 12:00PM
From NASA: https://blogs.nasa.gov/stationreport/2021/05/24/iss-daily-summary-report-5-24-2021/
Monday, May 24, 2021
How does the Moon's appearance change during a total lunar eclipse? The featured time-lapse video was digitally processed to keep the Moon bright and centered during the 5-hour eclipse of 2018 January 31. At first the full moon is visible because only a full moon can undergo a lunar eclipse. Stars move by in the background because the Moon orbits the Earth during the eclipse. The circular shadow of the Earth is then seen moving across the Moon. The light blue hue of the shadow's edge is related to why Earth's sky is blue, while the deep red hue of the shadow's center is related to why the Sun appears red when near the horizon. Tomorrow, people living from southeast Asia, across the Pacific, to the southwest Americas may get to see a Blood Supermoon Total Lunar Eclipse. Here the term blood refers to the (likely) red color of the fully eclipsed Moon, while the term supermoon indicates the Moon's slightly high angular size -- due to being relatively close to the Earth in its slightly elliptical orbit.
https://apod.nasa.gov/apod/ap210525.html ( May 25, 2021)
Sunday, May 23, 2021
Thunderstorms almost spoiled this view of the spectacular 2011 June 15 total lunar eclipse. Instead, storm clouds parted for 10 minutes during the total eclipse phase and lightning bolts contributed to the dramatic sky. Captured with a 30-second exposure the scene also inspired one of the more memorable titles (thanks to the astrophotographer) in APOD's now 25-year history. Of course, the lightning reference clearly makes sense, and the shadow play of the dark lunar eclipse was widely viewed across planet Earth in Europe, Africa, Asia, and Australia. The picture itself, however, was shot from the Greek island of Ikaria at Pezi. That area is known as "the planet of the goats" because of the rough terrain and strange looking rocks. The next total lunar eclipse will occur on Wednesday.
https://apod.nasa.gov/apod/ap210524.html ( May 24, 2021)
Saturday, May 22, 2021
First came the trees. In the town of Salamanca, Spain, the photographer noticed how distinctive a grove of oak trees looked after being pruned. Next came the galaxy. The photographer stayed up until 2 am, waiting until the Milky Way Galaxy rose above the level of a majestic looking oak. From this carefully chosen perspective, dust lanes in the galaxy appear to be natural continuations to branches of the tree. Last came the light. A flashlight was used on the far side of the tree to project a silhouette. By coincidence, other trees also appeared as similar silhouettes across the relatively bright horizon. The featured image was captured as a single 30-second frame in 2015 and processed to digitally enhance the Milky Way.
https://apod.nasa.gov/apod/ap210523.html ( May 23, 2021)
Friday, May 21, 2021
Near the heart of the Virgo Galaxy Cluster the string of galaxies known as Markarian's Chain stretches across this deep telescopic field of view. Anchored in the frame at bottom center by prominent lenticular galaxies, M84 (bottom) and M86, you can follow the chain up and to the right. Near center you'll spot the pair of interacting galaxies NGC 4438 and NGC 4435, known to some as Markarian's Eyes. Its center an estimated 50 million light-years distant, the Virgo Cluster itself is the nearest galaxy cluster. With up to about 2,000 member galaxies, it has a noticeable gravitational influence on our own Local Group of Galaxies. Within the Virgo Cluster at least seven galaxies in Markarian's Chain appear to move coherently, although others may appear to be part of the chain by chance.
https://apod.nasa.gov/apod/ap210522.html ( May 22, 2021)
Payloads Celestial Immunity: The crew thawed cell culture samples, exchanged media after centrifuge operations, and inoculated the 24-Well Plate and packed samples and plate for return. Dissecting the Influence of Gravity on Human Immune Function in Adults and the Elderly (Celestial Immunity) builds on earlier studies to evaluate how gravity affects functional immune response, from … ...
May 20, 2021 at 12:00PM
From NASA: https://blogs.nasa.gov/stationreport/2021/05/20/iss-daily-summary-report-5-20-2021/
NASA conducted its fourth RS-25 single-engine hot fire test of the year on May 20, 2021, a continuation of its seven-part test series.
from NASA http://www.nasa.gov/image-feature/firing-up-the-rs-25-engine-test-for-future-artemis-moon-missions
Thursday, May 20, 2021
Expansive Utopia Planitia on Mars is strewn with rocks and boulders in this 1976 image. Constructed from the Viking 2 lander's color and black and white image data, the scene approximates the appearance of the high northern martian plain to the human eye. For scale, the prominent rounded rock near center is about 20 centimeters (just under 8 inches) across. Farther back on the right side of the frame the a dark angular boulder spans about 1.5 meters (5 feet). Also in view are two trenches dug by the lander's sampler arm, the ejected protective shroud that covered the soil collector head, and one of the lander's dust covered footpads at the lower right. On May 14, China��������s Zhurong Mars rover successfully touchdown on Mars and has returned the first images of` its landing site in Utopia Planitia.
https://apod.nasa.gov/apod/ap210521.html ( May 21, 2021)
Payloads Celestial Immunity: The crew thawed cell cultures, exchanged media after centrifuge ops, and inoculated a 24-Well Plate. The samples were then inoculated and placed into cold stowage. Dissecting the Influence of Gravity on Human Immune Function in Adults and the Elderly (Celestial Immunity) builds on earlier studies to evaluate how gravity affects functional immune … …
May 19, 2021 at 12:00PM
From NASA: https://blogs.nasa.gov/stationreport/2021/05/19/iss-daily-summary-report-5-19-2021/
NASA astronaut Mark Vande Hei gets detailed views of his retina as part of regularly scheduled eye checks on the station.
from NASA http://www.nasa.gov/image-feature/astronaut-mark-vande-hei-gets-his-eyes-checked-on-station
Wednesday, May 19, 2021
In 1716, English astronomer Edmond Halley noted, "This is but a little Patch, but it shews itself to the naked Eye, when the Sky is serene and the Moon absent." Of course, M13 is now less modestly recognized as the Great Globular Cluster in Hercules, one of the brightest globular star clusters in the northern sky. Sharp telescopic views like this one reveal the spectacular cluster's hundreds of thousands of stars. At a distance of 25,000 light-years, the cluster stars crowd into a region 150 light-years in diameter. Approaching the cluster core upwards of 100 stars could be contained in a cube just 3 light-years on a side. For comparison, the closest star to the Sun is over 4 light-years away. The remarkable range of brightness recorded in this image follows stars into the dense cluster core. Distant background galaxies in the medium-wide field of view include NGC 6207 at the lower right.
https://apod.nasa.gov/apod/ap210520.html ( May 20, 2021)
Payloads AstroPi: The crew recorded a congratulation message for AstroPi Challenge 2020/21. Two augmented Raspberry Pi computers (called AstroPis) flown to the International Space Station as part of British ESA Astronaut Tim Peake’s mission are available for use during French ESA Astronaut Thomas Pesquet’s Proxima mission. The computers are both equipped with the mighty Sense … …
May 18, 2021 at 12:00PM
From NASA: https://blogs.nasa.gov/stationreport/2021/05/18/iss-daily-summary-report-5-18-2021/
May 18, 2021 at 12:00PM
From NASA: https://blogs.nasa.gov/stationreport/2021/05/18/iss-daily-summary-report-5-18-2021/
The Sub-Mesoscale Ocean Dynamics Experiment (S-MODE) mission team hopes to learn more about small-scale movements of ocean water such as eddies.
from NASA http://www.nasa.gov/image-feature/taking-to-the-air-and-sea-to-study-ocean-eddies
Tuesday, May 18, 2021
Normally faint and elusive, the Jellyfish Nebula is caught in this alluring scene. In the telescopic field of view two bright yellowish stars, Mu and Eta Geminorum, stand just below and above the Jellyfish Nebula at the left. Cool red giants, they lie at the foot of the celestial twin. The Jellyfish Nebula itself floats below and left of center, a bright arcing ridge of emission with dangling tentacles. In fact, the cosmic jellyfish is part of bubble-shaped supernova remnant IC 443, the expanding debris cloud from a massive star that exploded. Light from that 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 remnant of the collapsed stellar core. Composed on April 30, this telescopic snapshot also captures Mars. Now wandering through early evening skies, the Red Planet also shines with a yellowish glow on the right hand side of the field of view. Of course, the Jellyfish Nebula is about 5,000 light-years away, while Mars is currently almost 18 light-minutes from Earth.
https://apod.nasa.gov/apod/ap210519.html ( May 19, 2021)
Payloads: Antimicrobial Coatings (Boeing Environment Responding Antimicrobial Coatings): Per standard procedure, the crew touched both the coated and uncoated coupons for this long-term investigation. Boeing Environment Responding Antimicrobial Coatings tests is an antimicrobial coating on several different materials that represent high-touch surfaces. Some microbes change characteristics in microgravity, which could create new risks to crew … ...
May 17, 2021 at 12:00PM
From NASA: https://blogs.nasa.gov/stationreport/2021/05/17/iss-daily-summary-report-5-17-2021/
May 17, 2021 at 12:00PM
From NASA: https://blogs.nasa.gov/stationreport/2021/05/17/iss-daily-summary-report-5-17-2021/
Monday, May 17, 2021
What celestial body wears the Necklace Nebula? First, analyses indicate that the Necklace is a planetary nebula, a gas cloud emitted by a star toward the end of its life. Also, what appears to be diamonds in the Necklace are actually bright knots of glowing gas. In the center of the Necklace Nebula are likely two stars orbiting so close together that they share a common atmosphere and appear as one in the featured image by the Hubble Space Telescope. The red-glowing gas clouds on the upper left and lower right are the results of jets from the center. Exactly when and how the bright jets formed remains a topic of research. The Necklace Nebula is only about 5,000 years old, spans about 5 light years, and can best be found with a large telescope toward the direction of the constellation of the Arrow (Sagitta).
https://apod.nasa.gov/apod/ap210518.html ( May 18, 2021)
Flight Research Inc.’s Bell OH-58C Kiowa helicopter hovers over a helipad after completing an urban air mobility approach at NASA’s Armstrong Flight Research Center.
from NASA http://www.nasa.gov/image-feature/studying-urban-air-traffic
Sunday, May 16, 2021
Is our Milky Way Galaxy this thin? Magnificent spiral galaxy NGC 4565 is viewed edge-on from planet Earth. Also known as the Needle Galaxy for its narrow profile, bright NGC 4565 is a stop on many telescopic tours of the northern sky, in the faint but well-groomed constellation Coma Berenices. This sharp, colorful image reveals the spiral galaxy's boxy, bulging central core cut by obscuring dust lanes that lace NGC 4565's thin galactic plane. An assortment of other background galaxies is included in the pretty field of view. Thought similar in shape to our own Milky Way Galaxy, NGC 4565 lies about 40 million light-years distant and spans some 100,000 light-years. Easily spotted with small telescopes, sky enthusiasts consider NGC 4565 to be a prominent celestial masterpiece Messier missed.
https://apod.nasa.gov/apod/ap210517.html ( May 17, 2021)
Saturday, May 15, 2021
The clouds may look like an oyster, and the stars like pearls, but look beyond. Near the outskirts of the Small Magellanic Cloud, a satellite galaxy some 200 thousand light-years distant, lies 5 million year young star cluster NGC 602. Surrounded by natal gas and dust, NGC 602 is featured in this stunning Hubble image of the region. Fantastic ridges and swept back shapes strongly suggest that energetic radiation and shock waves from NGC 602's massive young stars have eroded the dusty material and triggered a progression of star formation moving away from the cluster's center. At the estimated distance of the Small Magellanic Cloud, the featured picture spans about 200 light-years, but a tantalizing assortment of background galaxies are also visible in this sharp multi-colored view. The background galaxies are hundreds of millions of light-years or more beyond NGC 602.
https://apod.nasa.gov/apod/ap210516.html ( May 16, 2021)
Friday, May 14, 2021
Undulating bright ridges and dusty clouds cross this close-up of the nearby star forming region M8, also known as the Lagoon Nebula. A sharp, false-color composite of narrow band visible and broad band near-infrared data from the 8-meter Gemini South Telescope, the entire view spans about 20 light-years through a region of the nebula sometimes called the Southern Cliff. The highly detailed image explores the association of many newborn stars imbedded in the tips of the bright-rimmed clouds and Herbig-Haro objects. Abundant in star-forming regions, Herbig-Haro objects are produced as powerful jets emitted by young stars in the process of formation heat the surrounding clouds of gas and dust. The cosmic Lagoon is found some 5,000 light-years away toward the constellation Sagittarius and the center of our Milky Way Galaxy. (For location and scale, check out this image superimposing the close-up of the Southern Cliff within the larger Lagoon Nebula. The scale image is courtesy R. Barba'.)
https://apod.nasa.gov/apod/ap210515.html ( May 15, 2021)
This image taken with the NASA/ESA Hubble Space Telescope showcases the emission nebula NGC 2313.
from NASA http://www.nasa.gov/image-feature/goddard/2021/hubble-spots-a-cosmic-cloud-s-silver-lining
Thursday, May 13, 2021
A gorgeous spiral galaxy, M104 is famous for its nearly edge-on profile featuring a broad ring of obscuring dust lanes. Seen in silhouette against an extensive central bulge of stars, the swath of cosmic dust lends a broad brimmed hat-like appearance to the galaxy suggesting a more popular moniker, the Sombrero Galaxy. This sharp optical view of the well-known galaxy made from ground-based image data was processed to preserve details often lost in overwhelming glare of M104's bright central bulge. Also known as NGC 4594, the Sombrero galaxy can be seen across the spectrum, and is host to a central supermassive black hole. About 50,000 light-years across and 28 million light-years away, M104 is one of the largest galaxies at the southern edge of the Virgo Galaxy Cluster. Still the colorful spiky foreground stars in this field of view lie well within our own Milky Way galaxy.
https://apod.nasa.gov/apod/ap210514.html ( May 14, 2021)
NASA’s X-59 requires the use of creative and strategic supersonic technologies to control and soften the jarring sound as the aircraft flies faster than the speed of sound.
from NASA http://www.nasa.gov/image-feature/a-view-of-nasa-s-x-59-engine-inlet
Wednesday, May 12, 2021
Closest to the Sun on March 1, and closest to planet Earth on April 23, this Comet ATLAS (C/2020 R4) shows a faint greenish coma and short tail in this pretty, telescopic field of view. Captured at its position on May 5, the comet was within the boundaries of northern constellation Canes Venatici (the Hunting Dogs), and near the line-of-sight to intriguing background galaxies popularly known as the Whale and the Hockey Stick. Cetacean in appearance but Milky Way sized, NGC 4631 is a spiral galaxy seen edge-on at the top right, some 25 million light-years away. NGC 4656/7 sports the bent-stick shape of interacting galaxies below and left of NGC 4631. In fact, the distortions and mingling trails of gas detected at other wavelengths suggest the cosmic Whale and Hockey Stick have had close encounters with each other in their distant past. Outbound and only about 7 light-minutes from Earth this Comet ATLAS should revisit the inner solar system in just under 1,000 years.
https://apod.nasa.gov/apod/ap210513.html ( May 13, 2021)
Tuesday, May 11, 2021
Is the night sky darkest in the direction opposite the Sun? No. In fact, a rarely discernable faint glow known as the gegenschein (German for "counter glow") can be seen 180 degrees around from the Sun in an extremely dark sky. The gegenschein is sunlight back-scattered off small interplanetary dust particles. These dust particles are millimeter sized splinters from asteroids and orbit in the ecliptic plane of the planets. Pictured here from last March is one of the more spectacular pictures of the gegenschein yet taken. The deep exposure of an extremely dark sky over Teide Observatory in Spain's Canary Islands shows the gegenschein as part of extended zodiacal light. Notable background objects include a bright meteor (on the left), the Big Dipper (top right), and Polaris (far right). The meteor nearly points toward Mount Teide, Spain's highest mountain, while the Pyramid solar laboratory is visible on the right. During the day, a phenomenon like the gegenschein called the glory can be seen in reflecting air or clouds opposite the Sun from an airplane.
https://apod.nasa.gov/apod/ap210512.html ( May 12, 2021)
Monday, May 10, 2021
What's happening behind Uluru? A United Nations World Heritage Site, Uluru is an extraordinary 350-meter high mountain in central Australia that rises sharply from nearly flat surroundings. Composed of sandstone, Uluru has slowly formed over the past 300 million years as softer rock eroded away. In the background of the featured image taken in mid-May, a raging thunderstorm is visible. Far behind both Uluru and the thunderstorm is a star-filled sky highlighted by the constellation of Orion. The Uluru region has been a home to humans for over 22,000 years. Local indigenous people have long noted that when the stars that compose the modern constellation of Orion first appear in the night sky, a hot season involving lightning storms will soon be arriving.
https://apod.nasa.gov/apod/ap210511.html ( May 11, 2021)
Sunday, May 9, 2021
Clusters of stars can be near or far, young or old, diffuse or compact. The featured image shows two quite contrasting open star clusters in the same field. M35, on the lower left, is relatively nearby at 2800 light years distant, relatively young at 150 million years old, and relatively diffuse, with about 2500 stars spread out over a volume 30 light years across. Bright blue stars frequently distinguish younger open clusters like M35. Contrastingly, NGC 2158, on the upper right, is four times more distant than M35, over 10 times older, and much more compact. NGC 2158's bright blue stars have self-destructed, leaving cluster light to be dominated by older and yellower stars. In general, open star clusters are found in the plane of our Milky Way Galaxy, and contain anywhere from 100 to 10,000 stars -- all of which formed at nearly the same time. Both open clusters M35 and NGC 2158 can be found together with a small telescope toward the constellation of the Twins (Gemini).
https://apod.nasa.gov/apod/ap210510.html ( May 10, 2021)
Saturday, May 8, 2021
The dark Horsehead Nebula and the glowing Orion Nebula are contrasting cosmic vistas. Adrift 1,500 light-years away in one of the night sky's most recognizable constellations, they appear in opposite corners of the above stunning mosaic. The familiar Horsehead nebula appears as a dark cloud, a small silhouette notched against the long red glow at the lower left. Alnitak is the easternmost star in Orion's belt and is seen as the brightest star to the left of the Horsehead. Below Alnitak is the Flame Nebula, with clouds of bright emission and dramatic dark dust lanes. The magnificent emission region, the Orion Nebula (aka M42), lies at the upper right. Immediately to its left is a prominent reflection nebula sometimes called the Running Man. Pervasive tendrils of glowing hydrogen gas are easily traced throughout the region.
https://apod.nasa.gov/apod/ap210509.html ( May 09, 2021)
Friday, May 7, 2021
In this evocative night scene a dusty central Milky Way rises over the ancient Andean archaeological site of Yacoraite in northwestern Argentina. The denizens of planet Earth reaching skyward are the large Argentine saguaro cactus currently native to the arid region. The unusual yellow-hued reflection nebula above is created by dust scattering starlight around red giant star Antares. Alpha star of the constellation Scorpius, Antares is over 500 light-years distant. Next to it bright blue Rho Ophiuchi is embedded in more typical dusty bluish reflection nebulae though. The deep night skyscape was created from a series of background exposures of the rising stars made while tracking the sky, and a foreground exposure of the landscape made with the camera and lens fixed on the tripod. In combination they produce the single stunning image and reveal a range of brightness and color that your eye can't quite perceive on its own.
https://apod.nasa.gov/apod/ap210508.html ( May 08, 2021)
This detailed image features Abell 3827, a galaxy cluster that offers a wealth of exciting possibilities for study.
from NASA http://www.nasa.gov/image-feature/goddard/2021/hubble-gazes-at-a-cluster-full-of-cosmic-clues
Thursday, May 6, 2021
Sixty years ago, near the dawn of the space age, NASA controllers "lit the candle" and sent Mercury astronaut Alan Shepard arcing into space atop a Redstone rocket. His cramped space capsule was dubbed Freedom 7. Broadcast live to a global television audience, the historic Mercury-Redstone 3 (MR-3) spacecraft was launched from Cape Canaveral Florida at 9:34 a.m. Eastern Time on May 5, 1961. The flight of Freedom 7, the first space flight by an American, followed less than a month after the first human venture into space by Soviet Cosmonaut Yuri Gagarin. The 15 minute sub-orbital flight achieved an altitude of 116 miles and a maximum speed of 5,134 miles per hour. As Shepard looked back near the peak of Freedom 7's trajectory, he could see the outlines of the west coast of Florida, Lake Okeechobe in central Florida, the Gulf of Mexico, and the Bahamas. Shepard would later view planet Earth from a more distant perspective and walk on the Moon as commander of the Apollo 14 mission.
https://apod.nasa.gov/apod/ap210507.html ( May 07, 2021)
Wednesday, May 5, 2021
NGC 3199 lies about 12,000 light-years away, a glowing cosmic cloud in the nautical southern constellation of Carina. The nebula is about 75 light-years across in this narrowband, false-color view. Though the deep image reveals a more or less complete bubble shape, it does look very lopsided with a much brighter edge along the top. Near the center is a Wolf-Rayet star, a massive, hot, short-lived star that generates an intense stellar wind. In fact, Wolf-Rayet stars are known to create nebulae with interesting shapes as their powerful winds sweep up surrounding interstellar material. In this case, the bright edge was thought to indicate a bow shock produced as the star plowed through a uniform medium, like a boat through water. But measurements have shown the star is not really moving directly toward the bright edge. So a more likely explanation is that the material surrounding the star is not uniform, but clumped and denser near the bright edge of windblown NGC 3199. https://apod.nasa.gov/apod/ap210506.html