The Lonely Neutron Star in Supernova Remnant E0102-72.3 - Astronomy picture of the day - 2018 September 30

The Lonely Neutron Star in Supernova Remnant E0102-72.3 

Credit: X-ray (NASA/CXC/ESO/F. Vogt et al.); Optical (ESO/VLT/MUSE & NASA/STScI)

Explanation: Why is this neutron star off-center? Recently a lone neutron star has been found within the debris left over from an old supernova explosion. The "lonely neutron star" in question is the blue dot at the center of the red nebula near the bottom left of E0102-72.3. In the featured image composite, blue represents X-ray light captured by NASA's Chandra Observatory, while red and green represent optical light captured by ESO's Very Large Telescopein Chile and NASA's Hubble Space Telescope in orbit. The displaced position of this neutron star is unexpected since the dense star is thought to be the core of the star that exploded in the supernova and created the outer nebula. It could be that the neutron star in E0102 was pushed away from the nebula's center by the supernova itself, but then it seems odd that the smaller red ring remains centered on the neutron star. Alternatively, the outer nebula could have been expelled during a different scenario -- perhaps even involving another star. Future observations of the nebulas and neutron star appear likely to resolve the situation.

Ces codes secrets donnent accès aux fonctions cachées du téléphone - Téléphonie

Nous avons tous notre téléphone portable à portée de main en permanence. Mais peu de gens connaissent toutes leurs options secrètes, qui peuvent être activées avec de simples combinaisons de touches. Il existe une grande variété de combinaisons, certaines s’appliquent à tous les types de téléphones, tandis que d’autres fonctionnent uniquement sur certains modèles.

Sympa-sympa.com a rassemblé en un seul article tous les codes intéressants qui vous donneront accès aux options cachées du portable.

Aerobuzz - L’A330-900 certifié en Europe - Aeronautique

Le programme A330neo a été mené en un temps réduit. Le premier vol a en effet eu lieu, il y a tout juste 11 mois. 1.400 heures de vol de certification ont été effectuées dans cet intervalle par trois avions dont l’appareil destiné à la compagnie portugaise TAP. Plusieurs options avaient déjà été évaluées en vol entre le quatrième trimestre 2015 et le deuxième trimestre 2017 sur un A330, avant même le premier vol.

L’A330-900 et l’A330-800 sont les deux variantes de l’A330neo, autrement dit du vénérable biréacteur long courrier A330 remotorisé avec des moteurs Trent 7000 de Rolls-Royce, et doté d’une voilure optimisée et de nouveaux sharklets (dispositifs d’extrémité de voilure) constitués de matériaux composites plus légers. « Ensemble, ces avancées se traduisent par une réduction significative de la consommation de carburant, de l’ordre de 25 pour cent par rapport aux avions de la même capacité des générations précédentes. », assure Airbus.

Aerobuzz

The Light, the Dark, and the Dusty - Astronomy picture of the day - 2018 September 28

The Light, the Dark, and the Dusty 
Image Credit & Copyright: Tasos Liampos

Explanation: This colorful skyscape spans about two full moons across nebula rich starfields along the plane of our Milky Way Galaxy in the royal northern constellation Cepheus. Near the edge of the region's massive molecular cloud some 2,400 light-years away, bright reddish emission region Sharpless (Sh) 155 is below and right of center, also known as the Cave Nebula. About 10 light-years across the cosmic cave's bright walls of gas are ionized by ultraviolet light from the hot young stars around it. Dusty blue reflection nebulae, like vdB 155 at upper left, and dense obscuring clouds of dust also abound on the interstellar canvas. Astronomical explorations have revealed other dramatic signs of star formation, including the bright red fleck of Herbig-Haro (HH) 168. Near top center in the frame, the Herbig-Haro object emission is generated by energetic jets from a newborn star.

The Sun's Spectrum with its Missing Colors - Astronomy picture of the day - 2018 September 26

The Sun's Spectrum with its Missing Colors  Image Credit: Nigel Sharp (NSF), FTS, NSO, KPNO, AURA, NSF

Explanation: It is still not known why the Sun's light is missing some colors. Here are all the visible colors of the Sun, produced by passing the Sun's light through a prism-like device. The spectrum was created at the McMath-PierceSolar Observatory and shows, first off, that although our white-appearing Sun emits light of nearly every color, it does indeed appear brightest in yellow-green light. The dark patches in the above spectrum arise from gas at or above theSun's surface absorbing sunlight emitted below. Since different types of gas absorb different colors of light, it is possible to determine what gasses compose the Sun. Helium, for example, was first discovered in 1870 on a solar spectrum and only later found here on Earth. Today, the majority of spectral absorption lines have been identified - but not all.

Highlights of the North Autumn Sky - Astronomy picture of the day - 2018 September 25

Highlights of the North Autumn Sky Illustration Credit & Copyright: Universe2go.com

Explanation: What can you see in the night sky this season? The featured graphic gives a few highlights for Earth's northern hemisphere. Viewed as a clock face centered at the bottom, early (northern) autumn sky events fan out toward the left, while late autumn events are projected toward the right. Objects relatively close to Earth are illustrated, in general, as nearer to the cartoon figure with the telescope at the bottom center -- although almost everything pictured can be seen without a telescope. As happens during any season, constellations appear the same year to year, and, as usual, the Leonids meteor shower will peak in mid-November. Also as usual, the International Space Station(ISS) can be seen, at times, as a bright spot drifting across the sky after sunset. Planets visible after sunset this autumn include Jupiter and Mars, and during late autumn, Saturn.

Rover 1A Hops on Asteroid Ryugu - Astronomy picture of the day - 2018 September 24

Rover 1A Hops on Asteroid Ryugu 
Image Credit & Copyright: ISAS, JAXA, Hayabusa2 Mission

Explanation: Two small robots have begun hopping around the surface of asteroid Ryugu. The rovers, each the size of a small frying pan, move around the low gravity of kilometer-sized 162173 Ryugu by hopping, staying aloft for about 15 minutes and typically landing again several meters away. On Saturday, Rover 1A returned an early picture of its new home world, on the left, during one of its first hops. On Friday, lander MINERVA-II-1 detached from its mothership Hayabusa2, dropped Rovers 1A and 1B, and then landed on Ryugu. Studying Ryugu could tell humanity not only about Ryugu's surface and interior, but about what materials were available in the early Solar System for thedevelopment of life. Two more hopping rovers are planned for release, and Hayabusa2 itself is scheduled to collect a surface sample from Ryugu and return it to Earth for detailed analysis before 2021.

Antonio Vivaldi - "Outono" - Video - Musica

"Outono"

Equinox: Analemma over the Callanish Stones - Astronomy picture of the day - 2018 September 23

Equinox: Analemma over the Callanish Stones 
Image Credit & Copyright: Giuseppe Petricca

Explanation: Does the Sun return to the same spot on the sky every day at the same time? No. A more visual answer to that question is an analemma, a composite image taken from the same spot at the same time over the course of a year. The featured analemma was composed from images taken every few days at 4 pm near the village of Callanish in the Outer Hebrides in Scotland, UK. In the foreground are the Callanish Stones, a stone circle built around 2700 BC during humanity's Bronze Age. It is not known if the placement of the Callanish Stones has or had astronomical significance. The ultimate causes for the figure-8 shape of this an all analemmas are the tilt of the Earth axis and theellipticity of the Earth's orbit around the Sun. At the solstices, the Sun will appear at the top or bottom of an analemma. Equinoxes, however, correspond to analemma middle points -- not the intersection point. Today at 1:54 am (UT) is the equinox ("equal night"), when day and night are equal over all of planet Earth. Many cultures celebrate a change of season at an equinox.

Window Seat over Hudson Bay - Astronomy picture of the day - 2018 September 22

Window Seat over Hudson Bay 
Image Credit & Copyright: Ralf Rohner

Explanation: On the August 18 night flight from San Francisco to Zurich, a window seat offered this tantalizing view when curtains of light draped a colorful glow across the sky over Hudson Bay. Constructed by digitally stacking six short exposures made with a hand held camera, the scene records the shimmering aurora borealis or northern lights just as the approaching high altitude sunrise illuminated the northeastern horizon. It also caught the flash of a Perseidmeteor streaking beneath the handle stars of the Big Dipper of the north. A few days past the meteor shower's peak, its trail still points across the sky toward Perseus. Beautiful aurorae and shower meteors both occur in Earth's upper atmosphere at altitudes of 100 kilometers or so, far above commercial airline fights. The aurora are caused by energetic charged particles from the magnetosphere, while meteors are trails of comet dust.