ARCHEOLOGIE - Bague de bronze

L'aigle romain, ou « Aquila », avait une signification profonde dans la Rome antique en tant que symbole de pouvoir, d'autorité et de prouesse militaire. Souvent représenté comme un aigle aux ailes déployées et un éclair dans ses serres, il était porté par les légions romaines comme étendard ou emblème. Cela symbolisait la loyauté de la légion envers l'État romain et l'empereur. La perte de l’étendard de l’aigle constituait un déshonneur important dans la culture militaire romaine. L'aigle romain perdure dans l'histoire en tant que symbole durable de la puissance et de l'héritage de l'empire.

Catawiki

ASTRONOMY - M1: The Incredible Expanding Crab

 2023 November 15

M1: The Incredible Expanding Crab
Image Credit: NASA, ESA, CSA, STScI; Jeff Hester (ASU), Allison Loll (ASU), Tea Temim (Princeton University)

Explanation: Cataloged as M1, the Crab Nebula is the first on Charles Messier's famous list of things which are not comets. In fact, the Crab Nebula is now known to be a supernova remnant, an expanding cloud of debris from the death explosion of a massive star. The violent birth of the Crab was witnessed by astronomers in the year 1054. Roughly 10 light-years across, the nebula is still expanding at a rate of about 1,500 kilometers per second. You can see the expansion by comparing these sharp images from the Hubble Space Telescope and James Webb Space Telescope. The Crab's dynamic, fragmented filaments were captured in visible light by Hubble in 2005 and Webb in infrared light in 2023. This cosmic crustacean lies about 6,500 light-years away in the constellation Taurus.

SANTé/MEDECINE - Le visage rouge

Notre corps nous envoie de nombreux signaux qui nous permettent de détecter certaines maladies.

Si vous avez les joues qui rougissent rapidement c’est peut être en raison d’une situation gênante ou de la chaleur, mais peut être aussi à cause d’une maladie de la peau. La rosacée se manifeste principalement chez les femmes et entraîne des rougeurs au niveau du visage. Elle peut également se manifester par la formation de nodules et d’ampoules. Les personnes à la peau plus claire sont plus sensibles à cette maladie.

Lastucerie

ASTRONOMY - Three Planets Rock

 2023 November 14

Three Planets Rock
Image Credit & Copyright: Giovanni Passalacqua; Text: Liz Coelho (Pikes Peak)

Explanation: In the fading darkness before dawn, a tilted triangle appeared to balance atop a rock formation off the southern tip of Sicily. Making up the points of the triangle are three of the four brightest objects visible in Earth’s sky: Jupiter, Venus and the Moon. Though a thin waning crescent, most of the moon’s disk is visible due to earthshine. Captured in this image on 2022 April 27, Venus (center) and Jupiter (left) are roughly three degrees apart -- and were headed toward a close conjunction. Conjunctions of Venus and Jupiter occur about once a year and are visible either in the east before sunrise or in the west after sunset. The featured image was taken about an hour before the arrival of the brightest object in Earth’s sky – the Sun.

SANTé/MEDECINE - Les paumes rouges

Maux de tête, toux ou nez qui coule ? Ce sont des symptômes que nous connaissons tous et que nous pouvons tous interpréter. Mais que se passe-t-il quand on a les paumes rouges ? Cela peut indiquer une réaction allergique ou une maladie hépatique. Une couleur rougeâtre peut être le signe d’une cirrhose du foie. Il faut donc absolument consulter un médecin si les rougeurs ne disparaissent pas d’elles-mêmes, surtout si vous vous sentez malade et léthargique.

Lastucerie

SANTé/MEDECINE - Gros seins

Notre corps nous envoie de nombreux signaux qui nous permettent de détecter certaines maladies.

Les femmes ayant une poitrine généreuse (bonnet D ou plus) sont plus sujettes au diabète que les autres. C’est en tout cas ce que démontre une étude canadienne. Inversement, pour les femmes avec une petite poitrine, le risque est beaucoup plus faible.

L'Astucerie

ASTRONOMY - The SAR and the Milky Way

 2023 November 11

ASTRONOMYImage Credit & Copyright: Julien Looten

Explanation: This broad, luminous red arc was a surprising visitor to partly cloudy evening skies over northern France. Captured extending toward the zenith in a west-to-east mosaic of images from November 5, the faint atmospheric ribbon of light is an example of a Stable Auroral Red (SAR) arc. The rare night sky phenomenon was also spotted at unusually low latitudes around world, along with more dynamic auroral displays during an intense geomagnetic storm. SAR arcs and their relation to auroral emission have been explored by citizen science and satellite investigations. From altitudes substantially above the normal auroral glow, the deep red SAR emission is thought to be caused by strong heating due to currents flowing in planet Earth's inner magnetosphere. Beyond this SAR, the Milky Way arcs above the cloud banks along the horizon, a regular visitor to night skies over northern France.

ASTRONOMY - M1: The Crab Nebula

 2023 November 9

M1: The Crab Nebula
Image Credit: NASA, ESA, CSA, STScI; Tea Temim (Princeton University)

Explanation: The Crab Nebula is cataloged as M1, the first object on Charles Messier's famous 18th century list of things which are not comets. In fact, the Crab is now known to be a supernova remnant, debris from the death explosion of a massive star witnessed by astronomers in the year 1054. This sharp image from the James Webb Space Telescope’s NIRCam (Near-Infrared Camera) and MIRI (Mid-Infrared Instrument) explores the eerie glow and fragmented strands of the still expanding cloud of interstellar debris in infrared light. One of the most exotic objects known to modern astronomers, the Crab Pulsar, a neutron star spinning 30 times a second, is visible as a bright spot near the nebula's center. Like a cosmic dynamo, this collapsed remnant of the stellar core powers the Crab's emission across the electromagnetic spectrum. Spanning about 12 light-years, the Crab Nebula is a mere 6,500 light-years away in the head-strong constellation

ASTRONOMY - Perseus Galaxy Cluster from Euclid

 2023 November 8

Perseus Galaxy Cluster from Euclid
Image Credit & License: ESA, Euclid, Euclid Consortium, NASA; Processing: Jean-Charles Cuillandre (CEA Paris-Saclay) & Giovanni Anselmi; Text: Jean-Charles Cuillandre

Explanation: There's a new space telescope in the sky: Euclid. Equipped with two large panoramic cameras, Euclid captures light from the visible to the near-infrared. It took five hours of observing for Euclid's 1.2-meter diameter primary mirror to capture, through its sharp optics, the 1000+ galaxies in the Perseus cluster, which lies 250 million light years away. More than 100,000 galaxies are visible in the background, some as far away as 10 billion light years. The revolutionary nature of Euclid lies in the combination of its wide field of view (twice the area of the full moon), its high angular resolution (thanks to its 620 Megapixel camera), and its infrared vision, which captures both images and spectra. Euclid's initial surveys, covering a third of the sky and recording over 2 billion galaxies, will enable a study of how dark matter and dark energy have shaped our universe.

ASTRONOMY - A Martian Dust Devil Spins By

 2023 November 7

A Martian Dust Devil Spins By
Video Credit: NASA, JPL-Caltech, Perseverance Rover; AI processing: PipploIMP

Explanation: It moved across the surface of Mars -- what was it? A dust devil. Such spinning columns of rising air are heated by the warm surface and are also common in warm and dry areas on planet Earth. Typically lasting only a few minutes, dust devils become visible as they pick up loose red-colored dust, leaving the darker and heavier sand beneath intact. Dust devils not only look cool -- they can leave visible trails, and have been credited with unexpected cleanings of the surfaces of solar panels. The images in the featured AI-interpolated video were captured in early August by the Perseverance rover currently searching for signs of ancient life in Jezero Crater. The six-second time-lapse video encapsulates a real duration of just over one minute. Visible in the distance, the spinning dust devil was estimated to be passing by at about 20 kilometers per hour and extend up about 2 kilometers high.