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04/11/2024

MUSIQUE - Vivaldi - Les Quatre saisons - L'été - Joshua Bell

"L'été"

ASTRONOMY - M42: The Great Nebula in Orion

 2024 November 4

A starfield is shown with a nebula glowing in red, purple,
and blue. Dark brown gas is also seen on the lower left. 
A small cluster of stars appears in the center.
Please see the explanation for more detailed information.

M42: The Great Nebula in Orion
Credit & Copyright: Fényes Lóránd

Explanation: The Great Nebula in Orion, an immense, nearby starbirth region, is probably the most famous of all astronomical nebulas. Here, glowing gas surrounds hot young stars at the edge of an immense interstellar molecular cloud only 1500 light-years away. In the featured deep image in assigned colors highlighted by emission in oxygen and hydrogen, wisps and sheets of dust and gas are particularly evident. The Great Nebula in Orion can be found with the unaided eye near the easily identifiable belt of three stars in the popular constellation Orion. In addition to housing a bright open cluster of stars known as the Trapezium, the Orion Nebula contains many stellar nurseries. These nurseries contain much hydrogen gas, hot young stars, proplyds, and stellar jets spewing material at high speeds. Also known as M42, the Orion Nebula spans about 40 light years and is located in the same spiral arm of our Galaxy as the Sun.

03/11/2024

VILLES BIONIQUES DU FUTUR - Solar Drop : une fleur en mer d’Oman


À Abou Dhabi, ce dôme est installé dans la baie et accueille un centre de cure thermale et une piscine. Les sept lieux d'habitations sont situés à l'extérieur, au plus près de l'eau, sur un cercle de 350 m de diamètre. Le dôme est surmonté de deux ellipses portant ce qui, vu de loin, apparaît comme un motif d'inspiration arabe. En fait, une série de seize spirales, sur le sommet, sont faites de cellules photovoltaïques. Autour, seize spirales sont plantées de végétaux qui favorisent la fraîcheur.

© Vincent Callebaut

ASTRONOMY - Jupiter Abyss

 024 November 3

Swirling clouds on the planet Jupiter are pictured, mostly
in white, tan, and light blue. A dark spot appears in the center
surrounded by swirling white and blue clouds. 
Please see the explanation for more detailed information.

Jupiter Abyss
Image Credit: NASAJunoSwRIMSSSProcessing & LicenseGerald Eichstädt & Sean Doran

Explanation: What's that black spot on Jupiter? No one is sure. During one pass of NASA's Juno over Jupiter, the robotic spacecraft imaged an usually dark cloud feature informally dubbed the Abyss. Surrounding cloud patterns show the Abyss to be at the center of a vortex. Since dark features on Jupiter's atmosphere tend to run deeper than light features, the Abyss may really be the deep hole that it appears -- but without more evidence that remains conjecture. The Abyss is surrounded by a complex of meandering clouds and other swirling storm systems, some of which are topped by light colored, high-altitude clouds. The featured image was captured in 2019 while Juno passed only about 15,000 kilometers above Jupiter's cloud tops. The next close pass of Juno near Jupiter will be in about three weeks.

02/11/2024

LES NUAGES DIEUX DU CIEL - Nuages en forme de chou-fleur (cumulonimbus calvus et cumulus congestus)


Cette photo a été prise près du lac Okeechobee, en Floride (États-Unis). Placés haut dans l'atmosphère, ces nuages en forme de chou-fleur sont des cumulonimbus (cumulonimbus calvus et cumulus congestus). Les cumulonimbus sont constitués de gouttelettes d'eau et, notamment dans leur région supérieure, par des cristaux de glace. Ils contiennent également de grosses gouttes de pluie et, souvent, des flocons de neige, de la neige roulée, du grésil ou des grêlons. Les gouttelettes d'eau et les gouttes de pluie peuvent être fortement surfondues. Les cumulonimbus peuvent se présenter soit isolément, soit disposés en une file continue, semblable à une vaste muraille. D'autre part, il peut arriver que la région supérieure des cumulonimbus soit mêlée à la masse d'un altostratus ou d'un nimbostratus. Des cumulonimbus peuvent également se développer au sein même de la masse nuageuse d'un altostratus ou d'un nimbostratus.

© Bernhard Mühr, Der Karlsruher Wolkenatlas, www.wolkenatlas.de

ASTRONOMY - Saturn at Night

 2024 November 2

See Explanation.  Clicking on the picture will download
the highest resolution version available.

Saturn at Night
Image Credit: NASAJPL-CaltechSpace Science InstituteMindaugas Macijauskas

Explanation: Saturn is bright in Earth's night skies. Telescopic views of the outer gas giant planet and its beautiful rings often make it a star at star parties. But this stunning view of Saturn's rings and night side just isn't possible from telescopes in the vicinity of planet Earth. Peering out from the inner Solar System they can only bring Saturn's day side into view. In fact, this image of Saturn's slender sunlit crescent with night's shadow cast across its broad and complex ring system was captured by the Cassini spacecraft. A robot spacecraft from planet Earth, Cassini called Saturn orbit home for 13 years before it was directed to dive into the atmosphere of the gas giant on September 15, 2017. This magnificent mosaic is composed of frames recorded by Cassini's wide-angle camera only two days before its grand final plunge. Saturn's night will not be seen again until another spaceship from Earth calls.

01/11/2024

LES NUAGES DIEUX DU CIEL - Stratocumulus dans le New Jersey


Stratocumulus. Photo prise dans le New Jersey (États-Unis).

© Nicholas T, Flickr, CC by-nc-sa 2.0

ASTRONOMY -Spiral Galaxy NGC 6744

2024 November 1
See Explanation.  Clicking on the picture will download
the highest resolution version available.

Spiral Galaxy NGC 6744
Image Credit & CopyrightJohn Hayes

Explanation: Big, beautiful spiral galaxy NGC 6744 is nearly 175,000 light-years across, larger than our own Milky Way. It lies some 30 million light-years distant in the southern constellation Pavo but appears as only a faint smudge in the eyepiece of a small telescope. We see the disk of the nearby island universe tilted towards our line of sight in this remarkably deep and detailed galaxy portrait, a telescopic image that spans an area about the angular size of a full moon. In it, the giant galaxy's elongated yellowish core is dominated by the light from old, cool stars. Beyond the core, grand spiral arms are filled with young blue star clusters and speckled with pinkish star forming regions. An extended arm sweeps past smaller satellite galaxy NGC 6744A at the upper left. NGC 6744's galactic companion is reminiscent of the Milky Way's satellite galaxy the Large Magellanic Cloud