Nombre total de pages vues
11/06/2024
SANTé/MEDECINE - L'immortalité pour bientôt - Faire de la place aux nouvelles générations
ASTRONOMY - Colorful Stars and Clouds near Rho Ophiuchi
2024 June 11
Image Credit & Copyright: Craig Stocks
Explanation: Why is the sky near Antares and Rho Ophiuchi so colorful, yet dusty? The colors result from a mixture of objects and processes. Fine dust -- illuminated by starlight -- produces blue reflection nebulae. Gaseous clouds whose atoms are excited by ultraviolet starlight produce reddish emission nebulae. Backlit dust clouds block starlight and so appear dark. Antares, a red supergiant and one of the brighter stars in the night sky, lights up the yellow-red clouds on the upper right of the featured image. The Rho Ophiuchi star system lies at the center of the blue reflection nebula on the left, while a different reflection nebula, IC 4605, lies just below and right of the image center. These star clouds are even more colorful than humans can see, emitting light across the electromagnetic spectrum.
10/06/2024
SANTé/MEDECINE - Anti-inflammatoires naturels - La sauge pour calmer la gingivite
SANTé/MEDECINE - L'imortalité pour bientôt - Vivre éternellement (ou presque)
ASTRONOMY - Sh2-132: The Lion Nebula
2024 June 10
Image Credit & Copyright: Imran Badr; Text: Natalia Lewandowska (SUNY Oswego)
Explanation: Is the Lion Nebula the real ruler of the constellation Cepheus? This powerful feline appearing nebula is powered by two massive stars, each with a mass over 20 times greater than our Sun. Formed from shells of ionized gas that have expanded, the nebula's energetic matter not only glows, but is dense enough to contract gravitationally and form stars. The angular size of the Lion Nebula, officially named Sh2-132, is slightly greater than that of the full moon. The gaseous iconic region resides about 10,000 light years away in a constellation named after the King of Aethopia in Greek mythology.
09/06/2024
SANTé/MEDECINE - L'immortalité pour bientôt - L'un des plus grands mystères de la vie
NUCLEAIRE - Comment survivre à une explosion nucléaire ? Gérez votre stress
ASTRONOMY - How to Identify that Light in the Sky
2024 June 9
Illustration Credit & Copyright: HK (The League of Lost Causes)
Explanation: What is that light in the sky? The answer to one of humanity's more common questions may emerge from a few quick observations. For example -- is it moving or blinking? If so, and if you live near a city, the answer is typically an airplane, since planes are so numerous and so few stars and satellites are bright enough to be seen over the glare of artificial city lights. If not, and if you live far from a city, that bright light is likely a planet such as Venus or Mars -- the former of which is constrained to appear near the horizon just before dawn or after dusk. Sometimes the low apparent motion of a distant airplane near the horizon makes it hard to tell from a bright planet, but even this can usually be discerned by the plane's motion over a few minutes. Still unsure? The featured chart gives a sometimes-humorous but mostly-accurate assessment. Dedicated sky enthusiasts will likely note -- and are encouraged to provide -- polite corrections.
08/06/2024
SANTé/MEDECINE - Virus et bactéries mortels - VIH : le virus du Sida et ses 30 millions de victimes
NUCLEAIRE - Comment survivre à une explosion nucléaire ? - Comment bien se préparer ?
SANTé/MEDECINE - Procédé révolutionnaire dans la lutte contre le cancer 3/6 : Les avantages de cette révolution
Moins d’effets secondaires, plus d’espoir Contrairement aux traitements traditionnels, cette méthode n’endommage pas les tissus sains. Les p...
-
2022 September 26 All the Water on Planet Earth Illustration Credit: Jack Cook, Adam Nieman, Woods Hole Oceanographic Institution ; Data ...
-
La majorité des grêlons qui tombent sous les orages et les averses ne pèsent que quelques grammes. Mais il y a quelques années, c'est un...