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Une femme qui monte dans un autobus bondé, s’approche d’un monsieur assis et lui dit :
- Pourriez-vous me laisser votre place, s’il vous plaît ? Je suis enceinte.
L’homme répond :
- Oui, bien sûr.
Il se lève et lui laisse sa place, puis demande :
- Mais ça ne se voit pas du tout. ça fait combien de temps ?
- Dix minutes. Mais ça m’a coupé les jambes !
What would it look like to circle a black hole? If the black hole was surrounded by a swirling disk of glowing and accreting gas, then the great gravity of the black hole would deflect light emitted by the disk to make it look very unusual. The featured animated video gives a visualization. The video starts with you, the observer, looking toward the black hole from just above the plane of the accretion disk. Surrounding the central black hole is a thin circular image of the orbiting disk that marks the position of the photon sphere -- inside of which lies the black hole's event horizon. Toward the left, parts of the large main image of the disk appear brighter as they move toward you. As the video continues, you loop over the black hole, soon looking down from the top, then passing through the disk plane on the far side, then returning to your original vantage point. The accretion disk does some interesting image inversions -- but never appears flat. Visualizations such as this are particularly relevant today as black holes are being imaged in unprecedented detail by the Event Horizon Telescope.
Du mal à découvrir des choses intéressantes sur Netflix ou Prime Vidéo ?
Cochez vos services de VOD, et explorez. Il y a même une option "aléatoire"
Il y’a quelques jours, j’ai passé mon premier entretien technique d’embauche, comme si je postulais pour un job. Et j’ai appliqué la méthode de Bob Bowman pour le préparer. Je te raconte tout ça dans cet article.
Un petit site pour faire des petits exercices de maths facilement.
2 minutes par jour semblent avoir un effet très positif : https://www.reddit.com/r/dataisbeautiful/comments/ifqqi9/i_spent_2_minutes_doing_mental_math_every_day_for/
(et un autre : https://www.tomscott.com/usvsth3m/maths/)
Les femelles aphides (pucerons) se reproduisent généralement par parthénogenèse sans jamais rencontrer de mâle, avec une mère qui donne naissance à des femelles déjà enceintes de leurs propres enfants. Cette évolution génétique peut donner jusqu'à 40 générations en une saison, ce qui leur permet d'envahir une plante très vite.
Quand la population grandit trop, certains aphides ont la possibilité de développer une paire d'ailes pour aller coloniser une plante voisine.
En français, il existe un degré supérieur au registre soutenu, principalement utilisé dans la poésie et la tragédie, qui use d’un vocabulaire spécifique, de constructions archaïques ou sophistiquées, etc. C’est le registre sublime aussi appelé littéraire, noble ou relevé.
This intergalactic skyscape features a peculiar system of galaxies cataloged as Arp 227 some 100 million light-years distant. Swimming within the boundaries of the constellation Pisces, Arp 227 consists of the two galaxies prominent right of center, the curious shell galaxy NGC 474 and its blue, spiral-armed neighbor NGC 470. The faint, wide arcs or shells of NGC 474 could have been formed by a gravitational encounter with neighbor NGC 470. Alternately the shells could be caused by a merger with a smaller galaxy producing an effect analogous to ripples across the surface of a pond. The large galaxy on the top lefthand side of the deep image, NGC 467, appears to be surrounded by faint shells too, evidence of another interacting galaxy system. Intriguing background galaxies are scattered around the field that also includes spiky foreground stars. Of course, those stars lie well within our own Milky Way Galaxy. The field of view spans 25 arc minutes or about 1/2 degree on the sky.
This exciting and unfamiliar view of the Orion Nebula is a visualization based on astronomical data and movie rendering techniques. Up close and personal with a famous stellar nursery normally seen from 1,500 light-years away, the digitally modeled frame transitions from a visible light representation based on Hubble data on the left to infrared data from the Spitzer Space Telescope on the right. The perspective at the center looks along a valley over a light-year wide, in the wall of the region's giant molecular cloud. Orion's valley ends in a cavity carved by the energetic winds and radiation of the massive central stars of the Trapezium star cluster. The single frame is part of a multiwavelength, three-dimensional video that lets the viewer experience an immersive, three minute flight through the Great Nebula of Orion.
