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26/06/2024

MUSIC - Dmitri Chostakovitch - Valse n° 2

"Valse n.° 2"

ASTRONOMY - Timelapse: Aurora SAR and the Milky Way

 2024 June 26

Timelapse: Aurora, SAR, and the Milky Way
Video Credit & Copyright: Jeff Dai (TWAN); Music (License): Suite bergamasque by Claude Debussy

Explanation: What's happening in the sky this unusual night? Most striking in the featured 4.5-hour 360-degree panoramic video, perhaps, is the pink and purple aurora. That's because this night, encompassing May 11, was famous for its auroral skies around the world. As the night progresses, auroral bands shimmer, the central band of our Milky Way Galaxy rises, and stars shift as the Earth rotates beneath them. Captured here simultaneously is a rare red band running above the aurora: a SAR arc, seen to change only slightly. The flashing below the horizon is caused by passing cars, while the moving spots in the sky are satellites and airplanes. The featured video was captured from XinjiangChina with four separate cameras.

25/06/2024

SANTé/MEDECINE - Anatomie du coeur humain - Vue de la valve tricuspide


La valve auriculo-ventriculaire droite, aussi appelée valve tricuspide, est une valve cardiaque composée de trois cuspides, qui sont des lames d'endocarde. Cette valve est attachée par des cordons de collagène blanc, qui relient les cuspides à la paroi du ventricule. Quand le cœur est relâché, la valve est ouverte, puis elle se ferme quand les ventricules se contractent.

© Patrick J. Lynch, CC by-sa 2.5

SANTé/MEDECINE - L'immortalité pour bientôt - L'immortalité biologique peut être réelle

Bien que cela semble farfelu, l'immortalité biologique a potentiellement été observée dans la vie marine, comme chez l'hydre, une minuscule créature d'eau douce dépourvue d'organes qui, selon 'DW', ne peut être tuée ou mourir de faim.

©Fournis par The Daily Digest

ASTRONOMY - The Dark Doodad Nebula

2024 June 25
A busy starfield is shown which an elongated brown 
nebula running diagonally from the lower left to the 
upper right. A bright blue star and a star cluster 
appear above the nebula. 
Please see the explanation for more detailed information.

The Dark Doodad Nebula
Image Credit & Copyright: Martin Pugh & Rocco Sung

Explanation: What is that strange brown ribbon on the sky? When observing the star cluster NGC 4372, observers frequently take note of an unusual dark streak nearby running about three degrees in length. The streak, actually a long molecular cloud, has become known as the Dark Doodad Nebula. (Doodad is slang for a thingy or a whatchamacallit.) Pictured here, the Dark Doodad Nebula sweeps across the center of a rich and colorful starfield. Its dark color comes from a high concentration of interstellar dust that preferentially scatters visible light. The globular star cluster NGC 4372 is visible as the fuzzy white spot on the far left, while the bright blue star gamma Muscae is seen to the cluster's upper right. The Dark Doodad Nebula can be found with strong binoculars toward the southern constellation of the Fly (Musca).

24/06/2024

SANTé/MEDECINE - Anatomie du coeur humain - Échocardiographie d’un cœur normal


Au centre, observez la valve de l'aorte qui empêche le sang de refluer dans le ventricule ; cette valve dite sigmoïde est composée de trois valvules en forme de pochettes. Le ventricule gauche est reconnaissable par sa paroi musculaire plus épaisse.

© Patrick J. Lynch, CC by-sa 2.5

SANTé/MEDECINE - L'immortalité pour bientôt - Bon appétit !

Non seulement cette technologie nous permet de tenir à distance le vieillissement et les maladies, mais en théorie, nous pouvons manger tout ce que nous voulons tout en gardant un corps en forme et plein d'énergie.

©Fournis par The Daily Digest

ASTRONOMY - JADES-GS-z14-0: A New Farthest Object

 2024 June 24

A dark field is shown filled with smudges that are
distant galaxies. One smudge is expanded in an inset box.
This box shows a reddish elongated object. 
Please see the explanation for more detailed information.

JADES-GS-z14-0: A New Farthest Object
Image Credit: NASAESACSASTScIB. Robertson (UC Santa Cruz), B. Johnson (CfA), S. Tacchella (Cambridge), P. Cargile (CfA)

Explanation: What if we could see back to the beginning of the universe? We could see galaxies forming. But what did galaxies look like back then? These questions took a step forward recently with the release of the analysis of a James Webb Space Telescope (JWST) image that included the most distant object yet discovered. Most galaxies formed at about 3 billion years after the Big Bang, but some formed earlier. Pictured in the inset box is JADES-GS-z14-0, a faint smudge of a galaxy that formed only 300 million years after the universe started. In technical terms, this galaxy lies at the record redshift of z=14.32, and so existed when the universe was only one fiftieth of the its present age. Practically all of the objects in the featured photograph are galaxies.

23/06/2024

SANTé/MEDECINE - Anatomie du coeur humain - Vue gauche du cœur : les structures internes


Dans cette illustration, le cœur gauche est coloré en rouge et le droit en bleu, en référence aux sangs qui transitent dans leurs cavités : le cœur gauche envoie du sang riche en oxygène dans l'organisme, tandis que le cœur droit reçoit le sang pauvre en oxygène. Trois valves cardiaques sont représentées : les valves auriculo-ventriculaires et la valve du tronc pulmonaire.

© Patrick J. Lynch, CC by-sa 2.5

ASTRONOMY - The Colors of Saturn from Cassini

 2024 June 23

Saturn is shown taking up most of the frame. Most of 
the planet appears a banded gold. A thin line that is the
rings appears dark brown and runs diagonally from the lower
left. The upper part has dark bands which are shadows and
behind the shadows the color of Saturn's atmosphere appears
blue. 
Please see the explanation for more detailed information.

The Colors of Saturn from Cassini
Image Credit: NASAESAJPLISSCassini Imaging TeamProcessing & LicenseJudy Schmidt

Explanation: What creates Saturn's colors? The featured picture of Saturn only slightly exaggerates what a human would see if hovering close to the giant ringed world. The image was taken in 2005 by the robot Cassini spacecraft that orbited Saturn from 2004 to 2017. Here Saturn's majestic rings appear directly only as a curved line, appearing brown, in part from its infrared glow. The rings best show their complex structure in the dark shadows they create across the upper part of the planet. The northern hemisphere of Saturn can appear partly blue for the same reason that Earth's skies can appear blue -- molecules in the cloudless portions of both planet's atmospheres are better at scattering blue light than red. When looking deep into Saturn's clouds, however, the natural gold hue of Saturn's clouds becomes dominant. It is not known why southern Saturn does not show the same blue hue -- one hypothesis holds that clouds are higher there. It is also not known why some of Saturn's clouds are colored gold.

LES PLUS BEAUX ASTRES DE LA VOIE LACTéE - L’imposant maître Soleil

Sur cette image, on peut apercevoir les tailles des différentes planètes du Système solaire ainsi que du Soleil . Ou comment se sentir tout...