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18/03/2024
SANTé/MEDECINE - Le fonctionnement de l'oeil humain - L'iris, la partie colorée de l'œil
SANTé/MEDECINE - Cancer du sein : attention à ces 5 symptômes - Un écoulement du mamelon
ASTRONOMY - Comet Pons-Brooks' Swirling Coma
2024 March 18
Image Credit & Copyright: Jan Erik Vallestad
Explanation: A bright comet will be visible during next month's total solar eclipse. This very unusual coincidence occurs because Comet 12P/Pons-Brooks's return to the inner Solar System places it by chance only 25 degrees away from the Sun during Earth's April 8 total solar eclipse. Currently the comet is just on the edge of visibility to the unaided eye, best visible with binoculars in the early evening sky toward the constellation of the Fish (Pisces). Comet Pons-Brooks, though, is putting on quite a show for deep camera images even now. The featured image is a composite of three very specific colors, showing the comet's ever-changing ion tail in light blue, its outer coma in green, and highlights some red-glowing gas around the coma in a spiral. The spiral is thought to be caused by gas being expelled by the slowly rotating nucleus of the giant iceberg comet. Although it is always difficult to predict the future brightness of comets, Comet Pons-Brook has been particularly prone to outbursts, making it even more difficult to predict how bright it will actually be as the Moon moves in front of the Sun on April 8.
17/03/2024
SANTé/MEDECINE - IRM montrant des yeux globuleux
SANTé/MEDECINE - Cancer du sein : attention à ces 5 symptômes - Une peau squameuse et sèche autour du mamelon
ASTRONOMY - NGC 7714: Starburst after Galaxy Collision
2024 March 17
Image Credit: NASA, ESA, Hubble Legacy Archive;
Processing & Copyright: Rudy Pohl
Explanation: Is this galaxy jumping through a giant ring of stars? Probably not. Although the precise dynamics behind the featured image is yet unclear, what is clear is that the pictured galaxy, NGC 7714, has been stretched and distorted by a recent collision with a neighboring galaxy. This smaller neighbor, NGC 7715, situated off to the left of the frame, is thought to have charged right through NGC 7714. Observations indicate that the golden ring pictured is composed of millions of older Sun-like stars that are likely co-moving with the interior bluer stars. In contrast, the bright center of NGC 7714 appears to be undergoing a burst of new star formation. The featured image was captured by the Hubble Space Telescope. NGC 7714 is located about 130 million light years away toward the constellation of the Two Fish (Pisces). The interactions between these galaxies likely started about 150 million years ago and should continue for several hundred million years more, after which a single central galaxy may result.
16/03/2024
SANTé/MEDECINE - La résonance magnétique révèle les vaisseaux du cerveau
SANTé/MEDECINE - HISTOIRE - L'autopsie du corps humain durant la Renaissance
ASTRONOMY - ELT and the Milky Way
2024 March 16
Image Credit & License: European Southern Observatory - Courtesy: Jens Scheidtmann
Explanation: The southern winter Milky Way sprawls across this night skyscape. Looking due south, the webcam view was recorded near local midnight on March 11 in dry, dark skies over the central Chilean Atacama desert. Seen below the graceful arc of diffuse starlight are satellite galaxies of the mighty Milky Way, also known as the Large and Small Magellanic clouds. In the foreground is the site of the European Southern Observatory's 40-metre-class Extremely Large Telescope (ELT). Under construction at the 3000 metre summit of Cerro Armazones, the ELT is on track to become planet Earth's biggest Eye on the Sky.
15/03/2024
SANTé/MEDECINE - Cancer du sein : attention à ces 5 symptômes - Une inversion du mamelon (2/5)

ASTRONOMY - Galaxies Stars and Dust
2025 August 28 Galaxies, Stars, and Dust Image Credit & Copyright : Robert Eder Explanation: This well-composed telescopic field o...

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2022 September 26 All the Water on Planet Earth Illustration Credit: Jack Cook, Adam Nieman, Woods Hole Oceanographic Institution ; Data ...
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2021 August 11 Mammatus Clouds over Saskatchewan Image Credit & Copyright: Michael F Johnston Explanation: When do cloud bottoms appe...