SANTé - DELICIEUSES HERBES AROMATIQUES - La menthe

Le genre Mentha se compose de plusieurs plantes herbacées de la famille des Labiacées. Celle-ci comprend de nombreuses espèces, dont beaucoup sont utilisées comme plantes aromatiques, condimentaires ou médicinales. C'est la menthe verte qui est la plus fréquemment utilisée comme herbe aromatique dans les cuisines méditerranéenne (thé à la menthe et taboulé) et asiatique (nems). Mais les diverses espèces servent également à la fabrication de sirops, de glaces et de sorbets. Son effet rafraîchissant se retrouve également dans les chewing-gums, les pastilles ou le dentifrice. La menthe poivrée, quant à elle, est essentiellement cultivée pour les besoins pharmaceutiques et en aromathérapie. 

© Talalosman, CC by-sa 3.0 ; Patrick Alexander, CC by-nc 2.0

FuturaSciences

ASTRONOMY - Mammatus Clouds over Nebraska

 2023 February 12

Mammatus Clouds over Nebraska
Image Credit & Copyright: Jorn Olsen Photography

Explanation: When do cloud bottoms appear like bubbles? Normally, cloud bottoms are flat. This is because moist warm air that rises and cools will condense into water droplets at a specific temperature, which usually corresponds to a very specific height. As water droplets grow, an opaque cloud forms. Under some conditions, however, cloud pockets can develop that contain large droplets of water or ice that fall into clear air as they evaporate. Such pockets may occur in turbulent air near a thunderstorm. Resulting mammatus clouds can appear especially dramatic if sunlit from the side. The mammatus clouds pictured here were photographed over Hastings, Nebraska during 2004 June.

ASTRONOMY - Airglow Sky over France

 2023 February 15

Airglow Sky over France
Image Credit & Copyright: Julien Looten

Explanation: This unusual sky was both familiar and unfamiliar. The photographer's mission was to capture the arch of the familiar central band of our Milky Way Galaxy over a picturesque medieval manor. The surprise was that on this January evening, the foreground sky was found glowing in a beautiful but unfamiliar manner. The striped bands are called airglow and they result from air high in Earth's atmosphere being excited by the Sun's light and emitting a faint light of its own. The bands cross the entire sky -- their curved appearance is due to the extremely wide angle of the camera lens. In the foreground lies Château de Losse in southwest France. Other familiar sky delights dot the distant background including the bright white star Sirius, the orange planet Mars, the blue Pleiades star cluster, the red California Nebula, and, on the far right, the extended Andromeda Galaxy. The initial mission was also successful: across the top of the frame is the arching band of our Milky Way.

SANTé - DELICIEUSES HERBES AROMATIQUES - Le fenouil

Le terme « fenouil » s'applique à plusieurs taxons distincts de la famille des Apiacées (anc. ombellifères). C'est le fenouil commun que l'on utilise en cuisine. Son goût ressemble à celui de l'anis. On peut cuisiner toutes les parties de la plante : racines, feuilles et graines. On peut le consommer cru, en salade, ou cuit.

Connues depuis l'Antiquité, ses qualités thérapeutiques sont essentiellement carminatives, expectorantes et antispasmodiques.

© Dominique Archambault/jinjian liang, CC by-nc 2.0

FuturaSciences

ASTRONOMY - The Heart and Soul Nebulas

 2023 February 14

The Heart and Soul Nebulas
Image Credit & Copyright: Juan Lozano de Haro

Explanation: Is the heart and soul of our Galaxy located in Cassiopeia? Possibly not, but that is where two bright emission nebulas nicknamed Heart and Soul can be found. The Heart Nebula, officially dubbed IC 1805 and visible in the featured image on the upper right, has a shape reminiscent of a classical heart symbol. The shape is perhaps fitting for Valentine's Day. The Soul Nebula is officially designated IC 1871 and is visible on the lower left. Both nebulas shine brightly in the red light of energized hydrogen, one of three colors shown in this three-color montage. Light takes about 6,000 years to reach us from these nebulas, which together span roughly 300 light years. Studies of stars and clusters like those found in the Heart and Soul nebulas have focused on how massive stars form and how they affect their environment.

ASTRONOMY - Comet ZTF and Mars

 2023 February 13

Comet ZTF and Mars
Image Credit & Copyright: Donato Lioce

Explanation: No, Comet ZTF is not going to hit Mars. Nicknamed the Green Comet for its bright green coma, C/2022 E3 (ZTF) did, however, pass almost in front of the much-more distant planet a few days ago, very near in time to when the featured picture was taken. The two sky icons were here captured behind a famous Earth icon -- the Matterhorn, a mountain in the Italian Alps with a picturesque peak. Both the foreground and background images were taken on the same evening by the same camera and from the same location. The comet's white dust tail is visible to the right of the green coma, while the light blue ion tail trails towards the top of the image. Orange Mars is well in front of the numerous background stars as well as the dark nebula Barnard 22 to its lower right. Although Mars remains visible in the evening sky for the next few months, Comet ZTF has already begun to fade as it returns to the outer Solar System.

ASTRONOMY - Stellar Wind-Shaped Nebula RCW 58

 2023 February 8

Stellar Wind-Shaped Nebula RCW 58
Image Credit & Copyright: Mike Selby & Mark Hanson; Text: Natalia Lewandowska (SUNY Oswego)

Explanation: Imagine traveling to a star about 100 times as massive as our Sun, a million times more luminous, and with 30 times the surface temperature. Such stars exist, and some are known as Wolf Rayet (WR) stars, named after French astronomers Charles Wolf and Georges Rayet. The central star in this image is WR 40 which is located toward the constellation of Carina. Stars like WR 40 live fast and die young in comparison with the Sun. They quickly exhaust their core hydrogen supply, move on to fusing heavier core elements, and expand while ejecting their outer layers via high stellar winds. In this case, the central star WR 40 ejects the atmosphere at a speed of nearly 100 kilometers per second, and these outer layers have become the expanding oval-shaped nebula RCW 58.

ASTRONOMY - The Colliding Spiral Galaxies of Arp 274

 2023 January 23

The Colliding Spiral Galaxies of Arp 274
Image Credit: NASA, ESA, Hubble; Processing & Copyright: Mehmet Hakan Özsaraç

Explanation: Two galaxies are squaring off in Virgo and here are the latest pictures. When two galaxies collide, the stars that compose them usually do not. This is because galaxies are mostly empty space and, however bright, stars only take up only a small fraction of that space. But during the collision, one galaxy can rip the other apart gravitationally, and dust and gas common to both galaxies does collide. If the two galaxies merge, black holes that likely resided in each galaxy center may eventually merge. Because the distances are so large, the whole thing takes place in slow motion -- over hundreds of millions of years. Besides the two large spiral galaxies, a smaller third galaxy is visible on the far left of the featured image of Arp 274, also known as NGC 5679. Arp 274 spans about 200,000 light years across and lies about 400 million light years away toward the constellation of Virgo.

MERVEILLEUX MONDE SOUS-MARIN - Canyon de Zhemchug - Mer de Béring (océan Pacifique)

Crédit photo: Capture d’écran – BBC

Le plus grand canyon du monde dans les océans est celui de Zhemchug dans la mer de Béring. Il a une profondeur de 2,6 kilomètres et est visible depuis l’espace.

GenerationVoyage

ASTRONOMY - In Green Company: Aurora over Norway

 2023 January 22

In Green Company: Aurora over Norway
Image Credit & Copyright: Max Rive

Explanation: Raise your arms if you see an aurora. With those instructions, two nights went by with, well, clouds -- mostly. On the third night of returning to same peaks, though, the sky not only cleared up but lit up with a spectacular auroral display. Arms went high in the air, patience and experience paid off, and the creative featured image was captured as a composite from three separate exposures. The setting is a summit of the Austnesfjorden fjord close to the town of Svolvear on the Lofoten islands in northern Norway. The time was early 2014. Although our Sun passed the solar minimum of its 11-year cycle only a few years ago, surface activity is picking up and already triggering more spectacular auroras here on Earth.