In 1920, Albert Michelson and Francis Pease mounted a 6-meter interferometer on the front of the 2.5-meter telescope at Mount Wilson Observatory. Le cataclysme se produirait ainsi à seulement 700 années-lumière de chez nous, soit à parfaite distance pour que nous puissions l’admirer sans pour autant en subir les perturbations. [131], In the late phase of stellar evolution, massive stars like Betelgeuse exhibit high rates of mass loss, possibly as much as one M☉ every 10,000 years, resulting in a complex circumstellar environment that is constantly in flux. “That could wreak havoc, killing plankton in the ocean and affecting the entire food chain.”. The best prediction is that Betelgeuse has already spent around 40,000 years as a red supergiant,[13] having left the main sequence perhaps one million years ago. It is proposed that this is due to granulation, similar to the same effect on the sun but on a much larger scale.[97]. Épisode : L'étoile Bételgeuse est-elle sur le point d’exploser ? Comment observer la pluie de météores des Orionides cette semaine ? “If Betelgeuse were to go off it would become roughly as bright as the full moon and maybe that could influence the circadian rhythms of certain animals a little bit, but it certainly wouldn't cause an extinction,” says Filippenko. Betelgeuse is so bright that it can be easily found in Orian constellation with the naked eyes. [187] To the Inuit, the appearance of Betelgeuse and Bellatrix high in the southern sky after sunset marked the beginning of spring and lengthening days in late February and early March. Découvrez nos newsletters complémentaires. There are other factors at play, too. Also, the world is excited to know the details of its explosion date. Betelgeuse star, one of the brightest stars of the night sky, is also known with the name Alpha Orionis. At near-infrared wavelengths, Betelgeuse is the brightest star in the night sky. Cette étoile particulière mérite donc toujours d’être surveillée, car il s’agit de l’un des candidats les plus proches de notre galaxie potentiellement sur le point de donner lieu à une supernova. [45] Recent work has corroborated this hypothesis, yet there are still uncertainties about the structure of their convection, the mechanism of their mass loss, the way dust forms in their extended atmosphere, and the conditions which precipitate their dramatic finale as a type II supernova. Veuillez vous reconnecter. [107] Other technological breakthroughs include adaptive optics,[108] space observatories like Hipparcos, Hubble and Spitzer,[46][109] and the Astronomical Multi-BEam Recombiner (AMBER), which combines the beams of three telescopes simultaneously, allowing researchers to achieve milliarcsecond spatial resolution. Il faudra continuer les observations pour en savoir plus mais il y a déjà plusieurs hypothèses. α Orionis (Latinised to Alpha Orionis) is the star's designation given by Johann Bayer in 1603. On 13 December 1920, Betelgeuse became the first star outside the Solar System to have the angular size of its photosphere measured. The Earth-observed angular diameter of Betelgeuse is exceeded only by those of R Doradus and the Sun. [161] Some mainstream media, like The Washington Post,[66] ABC News in Australia,[67] and Popular Science,[162] reported that a supernova was possible but unlikely, whilst other outlets portrayed a supernova as a realistic possibility.

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