Milky Way Arch over Amboseli National Park

image
Created for the OAE

Caption: Winner in the 2022 IAU OAE Astrophotography Contest, category Still images of celestial patterns.   This image was taken in July 2016 from the Amboseli National Park in Kenya, located close to the equator. In Egyptian mythology from northern Africa, the Milky Way was associated with a river sailed by gods and souls. The Zulu in South Africa interpret this pattern of dark and bright clouds of stars as an animal with black and white skin, whereas the South African Khoikhoi and San considered it “The Star’s Road”. In several South African cultures, the arch of the Milky Way is a pathway to the heavens formed by a mother goddess, according to a South African creation myth that was adopted in the 19th century from early ethnological research, but has vanished today. In the middle-right of the image we find the bright red star Antares in the modern constellation of the Scorpion and at the upper-left edge is the white star Vega that is considered a Male Steenbok by the peoples around Cape Town. Indigenous Australians have many names for the Milky Way. The Yolnu people of Arnhem Land in Australia’s Northern Territory refer to the Milky Way as Milnguya, the sky river. One of the prominent patterns in this image is associated with the contrast between the light and dark regions of the Milky Way. These dark regions are cool dense clouds of interstellar dust and gas, which block the light from stars behind them. One of the prominent patterns is that of the Celestial Emu referred to as Tchingal by several Indigenous peoples of south Australia. The head and beak of the emu (the Coalsack Nebula) lie to the bottom-left of the Southern Cross (seen in the far bottom-right of the image), and the body and legs stretch leftward from it. Other indigenous groups associate the dark regions with caves or waterways. The orientation of the emu over the year provides important clues as to when it is time to pick emu eggs, and when the eggs are hatching. In some months, when these clouds of the Milky Way are close to the horizon, they are not considered as emu at all but as two creeping crocodiles. The modern figure of the dark Pipe Nebula is clearly visible above the centre of the Galaxy; the smoke of this pipe reaches the colourful rho Ophiuchi region next to Antares in Scorpius, the orange-red star just above the Milky Way. Antares is referred to by the Boorong people as Djuit, the red-rumped parrot, while the Kokatha people of the Western Desert refer to Antares as Kogolongo, the red-tailed black cockatoo. In addition, some notable constellations can be seen: Cygnus, Aquila, Lyra, Scorpius, Sagittarius, Crux, and Centaurus. The pointer stars, Alpha and Beta Centauri, are occasionally interpreted as The Eyes of the Beast in some South African traditions.
Credit: Amirreza Kamkar/IAU OAE

Glossary Terms: Constellation , Dust , Milky Way , Scorpius , Southern Cross , Dust Cloud , Interstellar Extinction , Sagittarius , Alpha Centauri
Categories: Milky Way and Interstellar Medium , Naked Eye Astronomy

License: Creative Commons Attribution 4.0 International (CC BY 4.0) Creative Commons Attribution 4.0 International (CC BY 4.0) icons

This file on Zenodo ( image 5.13 MB)

Dust Clouds and Nebulae near R Coronae Australis

image

Caption: The image shows a dark and dusty cloud and some bright reflection nebulae near the binary star R Coronae Australis. The dark cloud spans several light-years and is located in the constellation Corona Australis near the constellation Sagittarius, in the direction of the Milky Way's center. The cloud appears to swallow the light of distant stars behind it as the dust particles in it scatter light passing through in all directions. This gives it the appearance of a void in the sky. This dark nebula is part of the broader Corona Australis Molecular Clouds. R Coronae Australis forms part of the Coronet Cluster, a collection of young stars which formed at some point in the last two million years. Around R Coronae Australis in the center of the image is the small reflection nebula NGC 6729 with two blueish reflection nebulae NGC 6726 and NGC 6727 lying to the upper right of it. In these nebulae the dust scatters light from bright stars near the nebula towards an observer on Earth, making it glow in this image.
Credit: ESO
Credit Link

Glossary Terms: Dark Nebula , Dust , Nebula , Interstellar Medium , Interstellar Extinction , Molecular Cloud
Categories: Milky Way and Interstellar Medium

License: Creative Commons Attribution 4.0 International (CC BY 4.0) Creative Commons Attribution 4.0 International (CC BY 4.0) icons

File ( image 20.18 MB)

Drive

image
Created for the OAE

Caption: Honourable mention in the 2022 IAU OAE Astrophotography Contest, category Still images of celestial patterns.   This image shows the Milky Way crossing the sky above the historical Bixby Bridge in Big Sur, a mountainous region in California, USA, in May 2021. The star directly above the shore is Antares, a red supergiant in the heart of the Scorpion. To its left, the clouds of the Milky Way seem to emerge from the same point of the horizon as the rocky landmass. Above the land, below the Milky Way in the left quarter of the image, is another bright star, Altair, the bright star in Aquila, the Eagle. The scorpion is considered a dangerous animal, so scorpion-men (human-scorpion hybrids) guarded the gate to the Netherworld in ancient Babylonian stories, as reported in the Gilgamesh saga. The Eagle, in contrast, appears in the Babylonian saga of King Etana who was taken to the sky by an Eagle and describes the world that he sees below him with increasing distance. Both heroes, Gilgamesh and Etana, are searching for the “herb of life” but one of them by going down, the other by travelling upwards. Gilgamesh aims to get back his dead friend Enkidu and to become immortal himself, while Etana is seeking the herb to help his wife become pregnant. The scorpion and the eagle are the animals supporting these heroes in their search, that ultimately remained unsuccessful. Gilgamesh finally learned that humans can only become immortal by their good deeds for humanity. The Eagle was also recognised in Greek culture, but it was only in Roman times that it became a messenger of a dead soul, carrying it towards the eternal stars. This was when Ptolemy created a constellation to represent the soul of Antinuous below the classical Eagle. This young friend and consultant of the Roman emperor Hadrian drowned in the Nile only seven years before the completion of the Almagest, and the whole Roman empire observed a state of national mourning. The Milky Way is seen as a “pathway of souls” by many cultures, but in the Babylonian culture, this is not the case. Still, in Greco-Roman philosophy, the bright white parts of it between Antares and Altair, at the intersection of the Milky Way and the Zodiac do have a meaning: Plato, Macrobius and other philosophers refer to it as “the X in the sky”, and the second Celestial Gate was probably considered to be here (the first one being the gate formed by the Hyades and Pleiades). These celestial pathways and gates, depicted above a gigantic bridge in the landscape and a site where the realms of land and ocean meet, make for an incredibly charged photograph. Additionally, the dark clouds in the Milky Way directly above the land form one of the two large dark constellations of the crocodiles, as interpreted by some people in southern Australia.
Credit: Marcin Zajac/IAU OAE

Glossary Terms: Dust , Milky Way , Scorpius , Dust Cloud , Interstellar Extinction
Categories: Milky Way and Interstellar Medium , Naked Eye Astronomy

License: Creative Commons Attribution 4.0 International (CC BY 4.0) Creative Commons Attribution 4.0 International (CC BY 4.0) icons

This file on Zenodo ( image 8.85 MB)

Herschel’s view of new stars and molecular clouds

image

Caption: This image shows the Westerhout 3, 4 and 5 star formation regions. This area has huge amounts of gas and dust. This gas and dust hides the physical processes going on in this region from studies using visible light. This image was taken in infrared light by the Herschel Space Observatory. This infrared light allowed Herschel to see deep into these star forming regions. In Westerhout 3, 4 and 5, huge, cold clouds of molecular hydrogen have collapsed into dense knots and filaments. Within these new structures the gas is dense and cold enough for it to collapse and form stars. These new stars give off powerful winds of charged particles, like stronger versions of the solar wind our sun gives off. These winds have combined to blow massive bubbles in the surrounding gas and dust. These are visible as the large darker voids in the image.
Credit: ESA/Herschel/NASA/JPL-Caltech; acknowledgement: R. Hurt (JPL-Caltech)
Credit Link

Glossary Terms: Infrared Astronomy , Star Formation , Interstellar Medium , Molecular Cloud , Stellar Wind
Categories: Milky Way and Interstellar Medium , Stars

License: Creative Commons Attribution 3.0 IGO Creative Commons Attribution 3.0 IGO icons

File ( image 4.53 MB)

Teide Observatory

image
Created for the OAE

Caption: Honourable mention in the 2022 IAU OAE Astrophotography Contest, category Still images of celestial patterns.   Taken in May 2022 in Teide National Park in Tenerife, Spain, this image shows the arc of the Milky Way galaxy crossing the sky, accompanied by prominent constellations over the professional telescopes located on the mountains of that island. While the telescopes and the people working with them may  ignore the constellations, the photographer managed to catch the Milky Way in such a way that it almost matches the shape of the mountain. The bright star in the top-left side of the image is Vega, one of the brightest stars in the night sky and located in the small constellation Lyra. Being a white star, it is the standard star astrophysicists use to define the colour scale. As it is also a relatively close star, only about 25 light-years away, with a relatively simple name, it frequently appears in modern science fiction, for example in Carl Sagan’s famous novel “Contact”, which was filmed in 1997 with Jodie Foster starring as a radio astronomer. The bright star seen below the galaxy and on the left half of the image is Altair, also one of the brightest stars in the night sky and located in the constellation Aquila. Together with Deneb — a star in the constellation Cygnus (the Swan) that is not visible in this image — Altair and Vega form the Summer Triangle, a characteristic asterism of popular astronomy in the northern hemisphere, where these telescopes are located. On the right side of the image we can see the constellation Scorpius. This is easily identified by its brightest star, Antares, the reddish star in the Scorpion’s heart. Below it, the whole body and tail of the Scorpion can be found and above it the celestial Scorpion's head is represented by three bright bluish stars. Below the tail and above the horizon, the constellation of Ara, the Altar, is half-visible, but like all the stars of Sagittarius in the Milky Way and the much fainter ones in Hercules and Ophiuchus above it, these constellations are more difficult to pinpoint in this photograph full of stars. The head of Ophiuchus is the relatively bright star in the middle between Vega and Antares. In addition to the huge size of this constellation, it is also important because it is the thirteenth one of the Zodiac, and the Sun spends roughly three weeks in Ophiuchus, after only five days in Scorpius. Furthermore, Ophiuchus represents the model for the mythological best doctor in the world, called Asklepios in Greek mythology, and Aesculab in Latin. His constellation praises all people working in medical professions, including nurses, pharmacists and doctors.
Credit: Curd-Christian Tengeler/IAU OAE

Glossary Terms: Astronomical Observatory , Astronomy , Dust , Milky Way , Scorpius , Dust Cloud , Interstellar Extinction
Categories: Milky Way and Interstellar Medium , Naked Eye Astronomy , Telescopes, Instruments and Observatories

License: Creative Commons Attribution 4.0 International (CC BY 4.0) Creative Commons Attribution 4.0 International (CC BY 4.0) icons

This file on Zenodo ( image 54.90 MB)