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26/03/2025
LA TERRE VUE DU CIEL - L’île de Kyūshū au Japon
ASTRONOMY - Star Formation in the Pacman Nebula
2025 March 26
Image Credit & Copyright: Juan Montilla (AAE)
Explanation: You'd think the Pacman Nebula would be eating stars, but actually it is forming them. Within the nebula, a cluster's young, massive stars are powering the pervasive nebular glow. The eye-catching shapes looming in the featured portrait of NGC 281 are sculpted dusty columns and dense Bok globules seen in silhouette, eroded by intense, energetic winds and radiation from the hot cluster stars. If they survive long enough, the dusty structures could also be sites of future star formation. Playfully called the Pacman Nebula because of its overall shape, NGC 281 is about 10,000 light-years away in the constellation Cassiopeia. This sharp composite image was made through narrow-band filters in Spain in mid 2024. It combines emissions from the nebula's hydrogen and oxygen atoms to synthesize red, green, and blue colors. The scene spans well over 80 light-years at the estimated distance of NGC 281.
25/03/2025
ASTRONOMY - A Blue Banded Blood Moon
2025 March 25
Image Credit & Copyright: Zixiong Jin
Explanation: What causes a blue band to cross the Moon during a lunar eclipse? The blue band is real but usually quite hard to see. The featured HDR image of last week's lunar eclipse, however -- taken from Norman, Oklahoma (USA) -- has been digitally processed to exaggerate the colors. The gray color on the upper right of the top lunar image is the Moon's natural color, directly illuminated by sunlight. The lower parts of the Moon on all three images are not directly lit by the Sun since it is being eclipsed -- it is in the Earth's shadow. It is faintly lit, though, by sunlight that has passed deep through Earth's atmosphere. This part of the Moon is red -- and called a blood Moon -- for the same reason that Earth's sunsets are red: because air scatters away more blue light than red. The unusual purple-blue band visible on the upper right of the top and middle images is different -- its color is augmented by sunlight that has passed high through Earth's atmosphere, where red light is better absorbed by ozone than blue.
24/03/2025
ORNITHOLOGIE - Pic de Pucheran : le tambour de la fôret à crête rouge
23/03/2025
SANTé/MEDECINE - Cancer colorectal : Symptômes - causes - traitement
ORNITHOLOGIE - Calliste safran à la gorge argentée
LA TERRE VUE DU CIEL - La ville de Christchurch en Nouvelle-Zélande
ASTRONOMY - Ancient Ogunquit Beach on Mars
2025 March 23
Image Credit: NASA, JPL-Caltech, MSSS, Curiosity Rover
Explanation: This was once a beach -- on ancient Mars. The featured 360-degree panorama, horizontally compressed, was taken in 2017 by the robotic Curiosity rover that explored the red planet. Named Ogunquit Beach after its terrestrial counterpart, evidence shows that at times long ago the area was underwater, while at other times it was at the edge of an ancient lake. The light peak in the central background is the top of Mount Sharp, the central feature in Gale Crater where Curiosity explored. Portions of the dark sands in the foreground were scooped up for analysis. The light colored bedrock is composed of sediment that likely settled at the bottom of the now-dried lakebed. The featured panorama (interactive version here) was created from over 100 images and seemingly signed by the rover on the lower left.
22/03/2025
SANTé/MEDECINE - Un mois avant un AVC votre corps vous avertit : 10 signaux à ne pas ignorer
ASTRONOMIE - L’éclipse de Soleil du 29 mars 2025
Stelvision
Astronomy - MESSIER CRATERS IN STEREO
2026 May 9 Messier Craters in Stereo Image Credit: Apollo 11 , NASA ; Stereo Image Copyright Patrick Vantuyne Explanation: Many bright ...
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Imaginez un monde où le cancer n’est plus une sentence, mais une simple étape à franchir. Grâce à une découverte révolutionnaire, ce rêve es...
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2026 January 1 Auroral Corona Image Credit & Copyright : Roi Levi Explanation: Cycle 25 solar maximum made 2025 a great year for ...


