Science & Technology - Astronomy picture of the day - 2019 January 31 : Sharpless 308: Star Bubble

"Sharpless 308: Star Bubble" 
Image Credit & Copyright: Laubing

Explanation: Blown by fast winds from a hot, massive star, this cosmic bubble is huge. Cataloged as Sharpless 2-308 it lies some 5,200 light-years away toward the constellation of the Big Dog (Canis Major) and covers slightly more of the sky than a Full Moon. That corresponds to a diameter of 60 light-years at its estimated distance. The massive star that created the bubble, a Wolf-Rayet star, is the bright one near the center of the nebula. Wolf-Rayet stars have over 20 times the mass of the Sun and are thought to be in a brief, pre-supernova phase of massive star evolution. Fast winds from this Wolf-Rayet star create the bubble-shaped nebula as they sweep up slower moving material from an earlier phase of evolution. The windblown nebula has an age of about 70,000 years. Relatively faint emission captured in the expansive image is dominated by the glow of ionized oxygen atoms mapped to a blue hue. SH2-308 is also known as The Dolphin Nebula.

Science & Technology - Astronomy picture of the day - 2019 January 30 : From the Northern to the Southern Cross

From the Northern to the Southern Cross 

Image Credit & Copyright: Nicholas Buer

Explanation: There is a road that connects the Northern to the Southern Cross but you have to be at the right place and time to see it. The road, as pictured here, is actually the central band of our Milky Way Galaxy; the right place, in this case, is dark Laguna Cejar in Salar de Atacama of Northern Chile; and the right time was in early October, just after sunset. Many sky wonders were captured then, including the bright Moon, inside the Milky Way arch; Venus, just above the Moon; Saturn and Mercury, just below the Moon; the Large and Small Magellanic Clouds satellite galaxies, on the far left; red airglow near the horizon on the image left; and the lights of small towns at several locations across the horizon. One might guess that composing this 30-image panorama would have been a serene experience, but for that one would have required earplugs to ignore the continued brays of wild donkeys.

Science & Technology : Lua cheia

Lua cheia

Science & Technology - Astronomy picture of the day - 2019 January 28 : Orion over the Austrian Alps

Orion over the Austrian Alps  
Image Credit & Copyright: Lukáš Veselý

Explanation: Do you recognize this constellation? Through the icicles and past the mountains is Orion, one of the most identifiable star groupings on the sky and an icon familiar to humanity for over 30,000 years. Orion has looked pretty much the same during the past 50,000 years and should continue to look the same for many thousands of years into the future. Orion is quite prominent in the sky this time of year, a recurring sign of (modern) winter in Earth's northern hemisphere and summer in the south. Pictured, Orion was captured recently above the Austrian Alps in a composite of seven images taken by the same camera in the same location during the same night. Below and slightly to the right of Orion's three-star belt is the Orion Nebula, while the four bright stars surrounding the belt are, clockwise from the upper left, Betelgeuse, Bellatrix, Rigel, and Saiph.

Science - Il était ...une éclipse : la Lune a pris des teintes bleutées

La Lune a pris des teintes bleutées.

21 janvier 2019, à Miami (Floride, Etats-Unis)

GASTON DE CARDENAS / AFP

Musica video ao vivo - Daniel Barenbom : "Tico tico no fubà"

"Tico tico no fubà"

Science & Technologie - Stelvision : Une belle éclipse totale de Lune le 21 janvier 2019

Une éclipse de Lune a lieu lorsque le Soleil, la Terre et notre satellite sont parfaitement alignés : la Lune se trouve alors dans l’ombre de la Terre. On pourrait croire qu’il est possible de voir une éclipse chaque mois au moment de la pleine lune, mais notre satellite circule sur une orbite inclinée de cinq degrés par rapport à celle de la Terre. La plupart du temps, notre satellite passe donc un peu au-dessus ou un peu au-dessous de l’alignement Soleil-Terre et il n’y a pas d’éclipse. La dernière éclipse totale visible en Europe remonte à juillet 2018 et la prochaine aura lieu en mai 2022.

Une éclipse totale de Lune dure plusieurs heures et comporte différentes phases. Les passages dans la pénombre de la Terre, en début et fin de phénomène, sont peu spectaculaires car la Lune reçoit encore une partie des rayons solaires : elle reste donc grise. Beaucoup plus intéressante, la période ou la Lune se trouve partiellement ou totalement dans l’ombre de notre planète doit retenir toute votre attention : c’est à ce moment que la Lune s’assombrit progressivement et change de couleur !

Une belle éclipse totale de Lune le 21 janvier 2019

Science & Technology - Astronomy picture of the day - 2019 January 21 : InSight Lander Takes Selfie on Mars

InSight Lander Takes Selfie on Mars  
Image Credit: NASA/JPL-Caltech

Explanation: This is what NASA's Insight lander looks like on Mars. With its solar panels, InSight is about the size of a small bus. Insight successfully landed on Mars in November with a main objective to detect seismic activity. The featured selfie is a compilation of several images taken of different parts of the InSight lander, by the lander's arm, at different times. SEIS, the orange-domed seismometer seen near the image center last month, has now been placed on the Martian surface. With this selfie, Mars InSight continues a long tradition of robotic spacecraft on Mars taking and returning images of themselves, including Viking, Sojourner, Pathfinder, Spirit, Opportunity, Phoenix, and Curiosity. Data taken by Mars Insight is expected to give humanity unprecedented data involving the interior of Mars, a region thought to harbor formation clues not only about Mars, but Earth.

Science & Technology video - Astronomy picture of the day - 2019 January 20 : A Total Lunar Eclipse Video

A Total Lunar Eclipse Video 
Video Credit & Copyright: Jun Ho Oh (KAIST, HuboLab), Kwon O Chul (TWAN), Jeong ByoungJun (RainbowAstro)

Explanation: Tonight a bright full Moon will fade to red. Tonight's moon will be particularly bright because it is reaching its fully lit phase when it is relatively close to the Earth in its elliptical orbit. In fact, by some measures of size and brightness, tonight's full Moon is designated a supermoon, although perhaps the "super" is overstated because it will be only a few percent larger and brighter than the average full Moon. However, our Moon will fade to a dim redbecause it will also undergo a total lunar eclipse -- an episode when the Moon becomes completely engulfed in Earth's shadow. The faint red color results from blue sunlight being more strongly scattered away by the Earth's atmosphere. A January full moon, like the one visible tonight, is referred to as a Wolf Moon in some cultures. Tonight's supermoon total eclipse will last over an hour and be best visible from North and South America after sunset. Thefeatured time-lapse video shows the last total lunar eclipse -- which occurred in 2018 July. The next total lunar eclipse will occur only in 2021 May.

Science & Technology - Astronomy picture of the day - 2019 January 18 : Cabin under the Stars

Cabin under the Stars
Image Credit & Copyright: P-M Hedén (Clear Skies, TWAN)

Explanation: Gocka's, a family nickname for the mountain cabin, and a wooden sled from a generation past stand quietly under the stars. The single exposure image was taken on January 6 from Tanndalen Sweden to evoke a simple visual experience of the dark mountain skies. A pale band of starlight along the Milky Way sweeps through the scene. At the foot of Orion the Hunter, bright star Rigel shines just above the old kicksled's handrail. Capella, alpha star of Auriga the celestial charioteer, is the brightest star at the top of the frame. In fact, the familiar stars of the winter hexagon and the Pleiades star cluster can all be found in this beautiful skyscape from a northern winter night.