ASTRONOMY - NGC 4372 and the Dark Doodad

 2023 March 30

NGC 4372 and the Dark Doodad
Image Credit & Copyright: Matias Tomasello

Explanation: The delightful Dark Doodad Nebula drifts through southern skies, a tantalizing target for binoculars toward the small constellation Musca, The Fly. The dusty cosmic cloud is seen against rich starfields just south of the Coalsack Nebula and the Southern Cross. Stretching for about 3 degrees across the center of this telephoto field of view, the Dark Doodad is punctuated near its southern tip (upper right) by yellowish globular star cluster NGC 4372. Of course NGC 4372 roams the halo of our Milky Way Galaxy, a background object some 20,000 light-years away and only by chance along our line-of-sight to the Dark Doodad. The Dark Doodad's well defined silhouette belongs to the Musca molecular cloud, but its better known alliterative moniker was first coined by astro-imager and writer Dennis di Cicco in 1986 while observing Comet Halley from the Australian outback. The Dark Doodad is around 700 light-years distant and over 30 light-years long.

AERONAUTIQUE - Le taxi volant français Atea est prêt à décoller

Développé à Toulouse, l’Atea est un aéronef à décollage vertical doté d’une motorisation hybride. Il peut emmener jusqu’à cinq passagers sur une distance de 400 kilomètres en croisant à 200 km/h.

Parmi les nombreux projets de taxis volants, il y a le projet français d'Ascendance Flight Technologies. Née en 2018, la société a été créée par quatre anciens ingénieurs d'Airbus qui planchaient sur l'avion électrique E-Fan. Leur concept d'aéronef VTOL (Vertical Take-off and Landing aircraft) porte le nom d'Atea. Cet appareil, de 14 mètres d'envergure, décolle donc à la verticale grâce à huit gros rotors totalement intégrés dans le carénage des deux paires d'ailes.

Pour basculer en vol en croisière, à l'avant et à l'arrière, deux moteurs à hélice prennent le relais. Les rotors d'ailes s'arrêtent à partir du moment où l'Atea a suffisamment de vitesse et donc de portance pour pouvoir s'en passer. Pour pouvoir emporter jusqu'à cinq personnes sur une distance de 400 kilomètres à une vitesse de croisière de 200 km/h, l'aéronef est équipé d'une motorisation hybride.

Décollage prévu en 2024.

FuturaSciences

ASTSRONOMY - Sh2-308: A Dolphin Shaped Star Bubble

 2023 March 29

Sh2-308: A Dolphin Shaped Star Bubble
Image Credit & Copyright: Aleix Roig (AstroCatInfo)

Explanation: Which star created this bubble? It wasn't the bright star on the bubble's right. And it also wasn't a giant space dolphin. It was the star in the blue nebula's center, a famously energetic Wolf-Rayet star. Wolf-Rayet stars in general have over 20 times the mass of our Sun and expel fast particle winds that can create iconic looking nebulas. In this case, the resulting star bubble spans over 60 light years, is about 70,000 years old, and happens to look like the head of a dolphin. Named Sh2-308 and dubbed the Dolphin-Head Nebula, the gas ball lies about 5,000 light years away and covers as much sky as the full moon -- although it is much dimmer. The nearby red-tinged clouds on the left of the featured image may owe their glow and shape to energetic light emitted from the same Wolf-Rayet star.

ASTRONOMY - A Multiple Green Flash Sunset

 2023 March 28

A Multiple Green Flash Sunset
Image Credit & Copyright: T. Slovinský & P. Horálek (IoP Opava); CTIO, NOIRLab, NSF, AURA

Explanation: Yes, but can your green flash do this? A green flash at sunset is a rare event that many Sun watchers pride themselves on having seen.  Once thought to be a myth, a green flash is now understood to occur when the Earth's atmosphere acts like both a prism and a lens. Different atmospheric layers create altitude-variable refraction that takes light from the top of the Sun and disperses its colors, creates two images, and magnifies it in just the right way to make a thin sliver appear green just before it disappears. Pictured, though, is an even more unusual sunset. From the high-altitude Cerro Tololo Inter-American Observatory in Chile one day last April, the Sun was captured setting beyond an atmosphere with multiple distinct thermal layers, creating several  mock images of the Sun.  This time and from this location, many of those layers produced a green flash simultaneously. Just seconds after this multiple-green-flash event was caught by two well-surprised astrophotographers, the Sun set below the clouds.

ART FRACTAL - Les somptueuses spirales de Mandelbrot

L'ensemble de Mandelbrot est une collection de points contenant des aires, des courbes lisses, des filaments, etc. Cette fractale forme des figures d'une beauté fascinante. L'image en montre un détail : les tons bleus et orange dominent et forment des spirales ressemblant à une coquille d'escargot. 

© Futura

ASTRONOMY - Aurora Over Arctic Henge

 2023 March 27

Aurora Over Arctic Henge
Image Credit & Copyright: Cari Letelier

Explanation: Reports of powerful solar flares started a seven-hour quest north to capture modern monuments against an aurora-filled sky. The peaks of iconic Arctic Henge in Raufarhöfn in northern Iceland were already aligned with the stars: some are lined up toward the exact north from one side and toward exact south from the other. The featured image, taken after sunset late last month, looks directly south, but since the composite image covers so much of the sky, the north star Polaris is actually visible at the very top of the frame. Also visible are familiar constellations including the Great Bear (Ursa Major) on the left, and the Hunter (Orion) on the lower right. The quest was successful. The sky lit up dramatically with bright and memorable auroras that shimmered with amazing colors including red, pink, yellow, and green -- sometimes several at once.

ACTIVITE SOLAIRE : Une tempête de très grande amplitude

Les scientifiques surveillent le Soleil de près. Un peu plus, même, ces dernières semaines. Parce qu'il semble être entré dans une phase tout particulièrement active.

La tempête a été classée G4 sur une échelle qui compte 5 niveaux. Les experts estiment que de tels événements peuvent se produire une centaine de fois par cycle solaire. Et cette tempête était bel et bien la plus puissante des tempêtes géomagnétiques enregistrées depuis six ans.

Pendant quelque 24 heures, le bouclier magnétique de la Terre s'est fendu. Des dommages ont pu être causés à des satellites, des incidents enregistrés sur les réseaux électriques, des perturbations apparaître sur les réseaux GPS ou encore des blackouts se faire sur les transmissions radio. Les scientifiques recueillent toujours des informations à ce sujet en ce moment même.

Elle a aussi donné naissance à de nombreuses et merveilleuses aurores boréales jusque dans le Nouveau-Mexique (États-Unis). Elles ont aussi été vues en Europe.

Les experts estiment aujourd'hui que des aurores boréales pourraient encore être observées dans les heures qui viennent aux latitudes moyennes. Alors, ouvrez l'oeil...

FuturaSciences

ASTRONOMY - Wanderers

 2023 March 26

Wanderers
Video Credit: Visuals: Erik Wernquist; Music: Christian Sandquist; Words & Voice: Carl Sagan

Explanation: How far out will humanity explore? If this video's fusion of real space imagery and fictional space visualizations is on the right track, then at least the Solar System. Some of the video's wondrous sequences depict future humans drifting through the rings of Saturn, exploring Jupiter from a nearby spacecraft, and jumping off a high cliff in the low gravity of a moon of Uranus. Although no one can know the future, wandering and exploring beyond boundaries -- both physical and intellectual -- is part of the human spirit and has frequently served humanity well in the past.

ASTRONOMY - Venus and the Da Vinci Glow

 2023 March 25

Venus and the Da Vinci Glow
Image Credit & Copyright: Giorgia Hofer

Explanation: On March 23 early evening skygazers could watch Venus and a young crescent moon, both near the western horizon. On that date Earth's brilliant evening star, faint lunar night side and slender sunlit crescent were captured in this telephoto skyscape posing alongside a church tower from Danta di Cadore, Dolomiti, Italy. Of course the subtle lunar illumination is earthshine, earthlight reflected from the Moon's night side. A description of earthshine, in terms of sunlight reflected by Earth's oceans illuminating the Moon's dark surface, was written over 500 years ago by Leonardo da Vinci. On March 24, from some locations the Moon could be seen to occult or pass in front of Venus. Around the planet tonight, a waxing lunar crescent will appear near the Pleiades star cluster.

ASTRONOMY - Dark Nebulae and Star Formation in Taurus

 2023 March 21

Dark Nebulae and Star Formation in Taurus
Image Credit & Copyright: Vikas Chander

Explanation: Can dust be beautiful? Yes, and it can also be useful. The Taurus molecular cloud has several bright stars, but it is the dark dust that really draws attention. The pervasive dust has waves and ripples and makes picturesque dust bunnies, but perhaps more importantly, it marks regions where interstellar gas is dense enough to gravitationally contract to form stars. In the image center is a light cloud lit by neighboring stars that is home not only to a famous nebula, but to a very young and massive famous star. Both the star, T Tauri, and the nebula, Hind's Variable Nebula, are seen to vary dramatically in brightness -- but not necessarily at the same time, adding to the mystery of this intriguing region. T Tauri and similar stars are now generally recognized to be Sun-like stars that are less than a few million years old and so still in the early stages of formation. The featured image spans about four degrees not far from the Pleiades star cluster, while the featured dust field lies about 400 light-years away.