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12/09/2025
SANTé/MEDECINE - Remèdes de Grand-mère - Dépuratif du foie
11/09/2025
ASTRONOMY - The Umbra of Earth
Image Credit & Copyright: Wang Letian (Eyes at Night)
Explanation: The dark, inner shadow of planet Earth is called the umbra. Shaped like a cone extending into space, it has a circular cross section most easily seen during a lunar eclipse. And on the night of September 7/8 the Full Moon passed near the center of Earth's umbral cone, entertaining eclipse watchers around much of our fair planet, including parts of Antarctica, Australia, Asia, Europe, and Africa. Recorded from Zhangjiakou City, China, this timelapse composite image uses successive pictures from the total lunar eclipse, progressing left to right, to reveal the curved cross-section of the umbral shadow sliding across the Moon. Sunlight scattered by the atmosphere into Earth's umbra causes the lunar surface to appear reddened during totality. But close to the umbra's edge, the limb of the eclipsed Moon shows a distinct blue hue. The blue eclipsed moonlight originates as rays of sunlight pass through layers high in the upper stratosphere, colored by ozone that scatters red light and transmits blue. In the total phase of this leisurely lunar eclipse, the Moon was completely within the Earth's umbra for about 83 minutes.
10/09/2025
ASTRONOMY - IRAS 04302: Butterfly Disk Planet Formation
2025 September 8
Image Credit: NASA, ESA, CSA, Webb; Processing: M. Villenave et al.
Explanation: This butterfly can hatch planets. The nebula fanning out from the star IRAS 04302+2247 may look like the wings of a butterfly, while the vertical brown stripe down the center may look like the butterfly's body -- but together they indicate an active planet-forming system. The featured picture was captured recently in infrared light by the Webb Space Telescope. Pictured, the vertical disk is thick with the gas and dust from which planets form. The disk shades visible and (most) infrared light from the central star, allowing a good view of the surrounding dust that reflects out light. In the next few million years, the dust disk will likely fragment into rings through the gravity of newly hatched planets. And a billion years from now, the remaining gas and dust will likely dissipate, leaving mainly the planets -- like in our Solar System.
09/09/2025
ASTRONOMY - Up from the Earth: Gigantic Jet Lightning
Image Credit: NASA, Expedition 73, Nicole Ayers
Explanation: What's that rising up from the Earth? When circling the Earth on the International Space Station early in July, astronaut Nicole Ayers saw an unusual type of lightning rising up from the Earth: a gigantic jet. The powerful jet appears near the center of the featured image in red, white, and blue. Giant jet lightning has only been known about for the past 25 years. The atmospheric jets are associated with thunderstorms and extend upwards towards Earth's ionosphere. The lower part of the frame shows the Earth at night, with Earth's thin atmosphere tinted green from airglow. City lights are visible, sometimes resolved, but usually creating diffuse white glows in intervening clouds. The top of the frame reveals distant stars in the dark night sky. The nature of gigantic jets and their possible association with other types of Transient Luminous Events (TLEs) such as blue jets and red sprites remain active topics of research.
ASTRONOMIE - Lune de sang
07/09/2025
ASTRONOMY - 2025 September 7
2025 September 7
Illustration Credit: Jack Cook, Adam Nieman, Woods Hole Oceanographic Institution; Data source: Igor Shiklomanov
Explanation: How much of planet Earth is made of water? Very little, actually. Although oceans of water cover about 70 percent of Earth's surface, these oceans are shallow compared to the Earth's radius. The featured illustration shows what would happen if all of the water on or near the surface of the Earth were bunched up into a ball. The radius of this ball would be only about 700 kilometers, less than half the radius of the Earth's Moon, but slightly larger than Saturn's moon Rhea which, like many moons in our outer Solar System, is mostly water ice. The next smallest ball depicts all of Earth's liquid fresh water, while the tiniest ball shows the volume of all of Earth's fresh-water lakes and rivers. How any of this water came to be on the Earth and whether any significant amount is trapped far beneath Earth's surface remain topics of research.
ASTRONOMIE - Un phénomène astronomique exceptionnel illuminera la nuit de rouge ce soir
06/09/2025
ASTRONOMIE - L’éclipse totale de Lune du 7 septembre 2025
Une éclipse totale… pas totalement visible
Que verra-t-on en France métropolitaine et dans les pays voisins ?
Un lever de lune fantomatique
- non seulement elle sera éclairée par une lumière rouge sombre caractéristique des éclipses (quelques rayons de lumière du Soleil lui parviennent après avoir été filtrés et réfractés, c’est-à-dire déviés, par l’atmosphère terrestre) ;
- mais aussi, nous la verrons à travers une épaisse couche d’air qui a toujours tendance à rendre rougeoyants les astres à leur lever ou à leur coucher (phénomène d’absorption, toujours cet effet de filtre).
NUCLEAIRE - Carte « L’industrie nucléaire en France »
CRIIRAD
ASTRONOMY - Sardinia Sunset
2025 September 6
Image Credit & Copyright: Lorenzo Busilacchi
Explanation: When the sun sets on September 7, the Full Moon will rise. And on that date denizens around much of our fair planet, including parts of Antarctica, Australia, Asia, Europe, and Africa can witness a total lunar eclipse, with the Moon completely immersed in Earth's shadow. As the bright Full Moon first enters Earth's shadow it will darken, finally taking on a reddish hue during the total eclipse phase. In fact, the color of the Moon during a total lunar eclipse is due to reddened light from sunrises and sunsets around planet Earth. The reddened sunlight is scattered by a dense atmosphere into the planet's otherwise dark central shadow. When the sun set on August 22, this telephoto snapshot of red skies, blue sea, and the Mangiabarche Lighthouse was captured from Sant'Antioco, Sardinia, Italy.
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