background preloader

Universe & Multiverse

Facebook Twitter

Sixty Symbols - Physics and Astronomy videos. SunAeon Solar System Simulator. The Observable Universe. WorldWide Telescope. Stellarium. Online Sky Map - Stelvision Astronomy.

Galaxy Zoo. Visions of the Future. The Kessler Syndrome Explained. The Kessler Syndrome: 10 Interesting and Disturbing Facts Low Earth Orbit, an area of outer space around Earth that encloses all orbits below 2000 km, is the home of the International Space Station and of other thousands of satellites.

The Kessler Syndrome Explained

It is also becoming a hazardous arena littered with mindless space junk and inoperable spacecraft orbiting at outrageous speeds. It’s a reality quite like Alfonso Cuarón’s film Gravity, and it’s called The Kessler Syndrome. If it plays out like the most pessimistic scenario, prepare to spend a few years without cell phone reception, Internet, and a five-day weather forecast. What is The Kessler Syndrome? The Scale of the Universe 2. Photopic Sky Survey. Zooniverse. This is the Most Detailed Map of the Universe to Date. Universe has 2 trillion galaxies, astronomers say. There are a dizzying two trillion galaxies in the universe, up to 20 times more than previously thought, astronomers reported on Thursday.

Universe has 2 trillion galaxies, astronomers say

The surprising finding, based on 3D modeling of images collected over 20 years by the Hubble Space Telescope, was published in the Astronomical Journal. Un trou noir supermassif libère des explosions de gaz dans une galaxie voisine. Deux émissions massives de gaz provenant d'un trou noir ont été enregistrées par le télescope spatial Chandra.

Un trou noir supermassif libère des explosions de gaz dans une galaxie voisine

Selon les astronomes, ce phénomène s’apparente à une sorte de "rot" après que le trou noir se soit nourri d’étoiles. Physicists Believe They've Discovered a Fifth Fundamental Force of the Universe. Although physics may seem complicated to the uninitiated (or even to the trained professional, for that matter), it’s worth remembering that physics deals with only four known forces: gravity (which keeps us from floating off the Earth); electromagnetism (which binds electrons to atoms, and atoms to each other); and two forces that operate over very short distances—the strong nuclear force (which binds atomic nuclei together) and the weak nuclear force (which governs certain kinds of radioactive decay).

Physicists Believe They've Discovered a Fifth Fundamental Force of the Universe

But if recent experimental work in particle physics pans out, we may have to get used to the idea of a fifth force. The research outlining the evidence for this fifth force was published last week in the journal Physical Review Letters. The Edge Of The Universe Is Closer Than Scientists Previously Thought. The visible universe just shrunk by 320 million light-years in all directions, updating a famous calculation that physicists first made 13 years ago.

The Edge Of The Universe Is Closer Than Scientists Previously Thought

If you're trying to calculate the size of the cosmos, the speed of light — the fastest anything can go — is a tempting place to begin and end. You'd reason that since the Big Bang happened some 13.8 billion years ago, there's a 13.8-billion-light-year radius marking the edge of what mere mortals could see. Not so. As physicists have shown again and again over the past century, space is expanding faster and faster. There's also a blinding glow of light that didn't clear up until about 378,000 years after the Big Bang — an event called recombination (when particles finally cooled down enough to form the first atoms).

If you take expansion, recombination, and other variables into account, as physicist J. New quantum mechanics theory says parallel universes exist, interact. Hubble identifie des étoiles "monstrueuses" 30 millions de fois plus brillantes que le Soleil. En utilisant le télescope spatial Hubble, des astronomes ont réussi à identifier neuf étoiles inconnues.

Hubble identifie des étoiles "monstrueuses" 30 millions de fois plus brillantes que le Soleil

Réunis dans un seul amas, ces astres sont de vrais mastodontes qui brilleraient ensemble 30 millions de fois plus que le Soleil. Avec ses 1,3 million de kilomètres de diamètre, le Soleil peut paraitre très impressionnant. Pourtant, il n'est pas grand chose face à certaines étoiles de l'Univers. Le télescope spatial Hubble vient une nouvelle fois d'en apporter la preuve, en découvrant de véritables "monstres" à 170.000 années-lumière de la Terre. Au nombre de neuf, les astres se situent plus précisément dans la nébuleuse de la Tarentule au sein du Grand Nuage de Magellan.

De multiples mastodontes au sein d'un même amas Les neuf étoiles identifiées présentent toutes une masse 100 fois supérieure à celle du Soleil. 2 Futures Can Explain Time's Mysterious Past. A detailed view of Betelgeuse on a collision course with a nearby wall of dust. One physical phenomenon that orders our entire universe. L'Univers pourrait avoir un "bouton de suppression", remettant en cause la physique telle que nous la connaissons. Des physiciens ont suggéré le fait que l’Univers pourrait avoir un mécanisme « d’autodestruction », de sorte que tout ce qui existe pourrait disparaître à jamais et à tout moment, sans aucun élément précurseur.

L'Univers pourrait avoir un "bouton de suppression", remettant en cause la physique telle que nous la connaissons

SIMBAD Astronomical Database. SIMBAD on the Web is the WWW interface to the SIMBAD database.

SIMBAD Astronomical Database

It offers the following functionalities: Query by identifiers and around identifiers Query by coordinates, specifying the radius and the equinox Query by bibcode and partial bibcode Sampling with a set of physical criteria Query by lists of objects, coordinates or bibcodes Display charts for list of objects resulting from coordinates query Moreover, the interface provides links with many other data services : Your Sky. By John Walker Welcome to Your Sky, the interactive planetarium of the Web.

Your Sky 100,000 Stars. Simulation 3D. The (Zoomable) Milky Way. Is our Milky Way galaxy a zombie, already dead and we don't know it? Kevin Schawinski, Swiss Federal Institute of Technology Zurich Like a zombie, the Milky Way galaxy may already be dead but it still keeps going.

Is our Milky Way galaxy a zombie, already dead and we don't know it?

Our galactic neighbor Andromeda almost certainly expired a few billion years ago, but only recently started showing outward signs of its demise. Galaxies seem to be able to “perish” – that is, stop turning gas into new stars – via two very different pathways, driven by very different processes. Galaxies like the Milky Way and Andromeda do so very, very slowly over billions of years. How and why galaxies “quench” their star formation and change their morphology, or shape, is one of the big questions in extragalactic astrophysics. Galaxies grow by making new stars. The Cosmic Accident of Life: Alan Lightman on Dark Energy, the Multiverse, and Why We Exist.

Quelques éléments de physique et de philosophie des multivers. Quelques éléments de physique et de philosophie des multiversPar Aurélien BarrauEssai publié en libre-accès 130 pages Présentation par Jean-Paul Baquiast 06/10/2007. Multiverse. Multiverse. Multiverse. Quantique. Une belle représentation du multivers... - Trust My Science. Why the multiverse is all about you - The Philosopher's Zone.

In general, quantum physicists don't have much truck with big conceptual schemes. But one of their own has broken rank. Christopher Fuchs tells Joe Gelonesi how a particular school of 20th century philosophy helps him make quantum leaps. Quantum mechanics can be tough to get your head round. UNIVERS PARALLELES, MULTIVERS - Pearltrees voisins (sources) Parallel Universes: Theories & Evidence. Livres/ UNIVERS PARALLELES, MULTIVERS (sources) Exploring Parallel Universes.

SCIENCES QUANTIQUES (médias) Holographic Universe. Images. Software. Astronomical Paradigms. The Universe. 'Gaian Bottleneck Theory' Explains Why We Haven't Found Any Aliens. The aliens are silent because they're dead. Life on other planets would likely be brief and become extinct very quickly, say astrobiologists from The Australian National University (ANU). In research aiming to understand how life might develop, the scientists realised new life would commonly die out due to runaway heating or cooling on their fledgling planets.

"The universe is probably filled with habitable planets, so many scientists think it should be teeming with aliens," said Dr Aditya Chopra from the ANU Research School of Earth Sciences and lead author on the paper, which is published in Astrobiology. "Early life is fragile, so we believe it rarely evolves quickly enough to survive. " "Most early planetary environments are unstable. To produce a habitable planet, life forms need to regulate greenhouse gases such as water and carbon dioxide to keep surface temperatures stable. " About four billion years ago Earth, Venus and Mars may have all been habitable. The Absurdity of Infinity: Astrophysicist Janna Levin Explains Whether the Universe Is Infinite or Finite in Letters to Her Mother – Brain Pickings. By Maria Popova In 1998, while on the cusp of becoming one of the most significant theoretical cosmologists of our time, mathematician-turned-astrophysicist Janna Levin left her post at Berkeley and moved across the Atlantic for a prestigious position at Cambridge University.

During the year and a half there, she had the time and space to contemplate the question that would eventually become the epicenter of her career — whether the universe is infinite or finite. What began as a series of letters to her mother, Sandy, eventually became an unusual diary of Levin’s “social exile as a roaming scientist,” and was finally published as How the Universe Got Its Spots: Diary of a Finite Time in a Finite Space (public library) — a most unusual and absorbing account of the paradoxes of finitude. In an entry from September 3, 1998, Levin fleshes out her ideas on infinity and writes with exquisite Saganesque sensitivity to the poetics of science: Geometry of the Universe.

It Does Something A Lot Weirder. Memories of Kurt Gödel. There Is No Time. There Never Was and There Never Will Be. By: Josh Richardson, Prevent Disease. A Debate Over The Physics Of Time. Space-time AND time-space. Leaves something to be desired. 10 Strange Things About The Universe. Space. 10 Mind-Bending Implications of the Many Worlds Theory. Il Multiverso e la Tempesta di Shakespeare. Carl Sagan: Fourth dimension explanation. The Sagan Series. Voyager - The Interstellar Mission. Universe. Espace. L'espace. Astronomy. Astronomie.

Astronomy. Astronomy/Physics. The Daily Galaxy - Science, Space, Tech. The Worlds of David Darling. Cassini Solstice Mission. How the Higgs Boson Might Spell Doom for the Universe. Spinning black hole: Scientists measure supermassive black hole rotating at nearly the speed of light.

Hubble's Panoramic View. Visual thinking: Spacetime. Fractales. Universe Sandbox. Deep Time - Interactive Infographic. Einstein's Unfinished Dream: Marrying Relativity to the Quantum World. Physics. Physics. Physics. Physics. Quantum Entanglement harvesting in a vacuum. Quantum Entanglement. Quantum Entanglement. Quantum physics just got less complicated. Gravitational Waves and How They Distort Space - Universe Today. Gravitational Waves Explained. Il realismo locale non c'è più. How Quantum Suicide Works. Quantum fluctuations of the vacuum. Alice in Quantumland: A Charming Illustrated Allegory of Quantum Mechanics by a CERN Physicist. Nothingness: Why nothing matters.

Théorie Des Cordes. Quantum - String Theory.