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Omar Loisel
53,104 followers -
Amateur astronomy, cosmology, astrophysics and physics in general, music, film, photography, painting, sports and many other things - Amateur d'astronomie, de cosmologie, d'astrophysique et de physique en général, de musique, de cinéma, de photo, de peinture, de sport ainsi que de beaucoup d'autres choses
Amateur astronomy, cosmology, astrophysics and physics in general, music, film, photography, painting, sports and many other things - Amateur d'astronomie, de cosmologie, d'astrophysique et de physique en général, de musique, de cinéma, de photo, de peinture, de sport ainsi que de beaucoup d'autres choses

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The Alaskan tsunami that created waves as high as Seattle's Space Needle

Six-hundred-foot waves crashed down on the coasts of Taan Fiord, Alaska after a massive landslide sent more than 100 million tons of rocks into the water on Oct. 17, 2015.

Read more : https://phys.org/news/2017-08-alaskan-tsunami-high-seattle-space.html

A skid driving into Taan Fiord, Alaska. Credit: Photo/Bjorn Olson
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X-ray observations reveal new details about the solar-type star HD 209458

By analyzing sets of data obtained by two X-ray space observatories, a team of German researchers has learned new insights into the nature of a solar-type star known as HD 209458. The new study, published Aug. 15 in a paper on arXiv.org, uncovers X-ray properties of the star.

Read more : https://phys.org/news/2017-08-x-ray-reveal-solar-type-star-hd.html

Chandra HRC-I image of HD 209458. Credit: Czesla et al., 2017.
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Un poisson à quatre rétines voit dans toutes les directions

Un poisson vivant dans les eaux profondes de la mer de Tasman, Rhynchohyalus natalensis, peut voir à 360° grâce à une organisation de l'œil unique dans le monde animal.

Plus d'info : http://www.futura-sciences.com/planete/actualites/zoologie-poisson-quatre-retines-voit-toutes-directions-53037/#xtor=RSS-8

Vue latérale de l’œil droit du poisson : la flèche bleue montre la réflexion de la lumière dans le miroir situé dans l’œil. © Partridge et al., Proceedings of the Royal Society B, cc by 3.0
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Total Solar Eclipse of 1979

Image Credit & Copyright: Jimmy Westlake (Colorado Mountain College)

Explanation: From cold, clear skies over Riverton, Manitoba, Canada, planet Earth, the solar corona surrounds the silhouette of the New Moon in this telescopic snapshot of the total solar eclipse of February 26, 1979. Thirty eight years ago, it was the last total solar eclipse visible from the contiguous United States. The narrow path of totality ran through the northwestern states of Washington, Oregon, Idaho, Montana, and North Dakota before crossing into Canadian provinces Saskatchewan, Manitoba, Ontario and Quebec. Following the upcoming August 21, 2017 total solar eclipse crossing the U.S. from coast to coast, an annular solar eclipse will be seen in the continental United States on October 14, 2023, visible along a route from Northern California to Florida. Then, the next total solar eclipse to touch the continental U.S. will track across 13 states from from Texas to Maine on April 8, 2024.

https://apod.nasa.gov/apod/ap170819.html
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Ask Ethan: Do Black Holes Grow Faster Than They Evaporate? (Synopsis)
Posted by Ethan on August 19, 2017

So, you’ve got a black hole in the Universe, and you want to know what happens next. The space around it is curved due to the presence of the central mass, with greater curvature occurring closer to the center. There’s an event horizon, a location from which light cannot escape. And there’s the quantum nature of the Universe, which means that the zero-point-energy of empty space has a positive value: it’s greater than zero. Put them together, and you get some interesting consequences.

Read more : http://scienceblogs.com/startswithabang/2017/08/19/ask-ethan-do-black-holes-grow-faster-than-they-evaporate-synopsis/

Particle-antiparticles pairs pop in-and-out of existence continuously, both inside and outside the event horizon of a black hole. When an outside-created pair has one of its members fall in, that’s when things get interesting. Image credit: Ulf Leonhardt of the University of St. Andrews.
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Un nouveau télescope pour révolutionner l'astronomie amateur

Développé par la société française Unistellar, l'eVscope est un télescope formant rapidement des images en couleurs de galaxies et nébuleuses qui apparaissent alors à l'œil nu pour un utilisateur regardant dans son oculaire.

L'eVscope reconnaît les objets qu'il observe.

C'est un outil de science citoyenne, qui peut se connecter à l'institut Seti, dans le but de centraliser un grand nombre d'observations effectuées simultanément en différents points de la Planète lors d'évènements transitoires.

Le développement de l'eVscope se poursuit et devrait être accessible commercialement à moins de 1.000 euros d'ici un an.

Plus d'info : http://www.futura-sciences.com/sciences/actualites/astronomie-nouveau-telescope-revolutionner-astronomie-amateur-68117/#xtor=RSS-8

Une présentation réaliste de la performance réalisée avec l'eVscope. © Unistellar SAS

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