Minute earth the story of our planet - Google Search. Minutephysics. Thanks to Embry-Riddle Aeronautical University for supporting us on Subbable.com! - A big thanks as well to Subbable supporters The Great Tobini (aka Tobyn Pearson) and Georgi Yanev! You make it possible for us to continue making MinutePhysics Music video - to do When it's Cold Outside - Galaxy simulation by Rob Crain (Leiden) and the Virgo Consortium, visualization by Rob Crain (Leiden) and Jim Geach (Hertfordshire) Recreational mathemusician - Google Search. Detectable Civilizations in our Galaxy 5 | Life in the Universe. Publishing Group : science journals, jobs, and information. Publishing Group : Login to your Nature.com account. Future Society & Enviroment. A Cosmic Smashup and a Dark Matter Mystery? : Starts With A Bang. “I soon became convinced… that all the theorizing would be empty brain exercise and therefore a waste of time unless one first ascertained what the population of the Universe really consists of.”
-Fritz Zwicky You very likely know that there are four fundamental forces in the Universe: gravity, electromagnetism, and the weak and strong nuclear forces. While only some particles experience the nuclear and electromagnetic forces, anything with mass or energy — which is everything we know of — is subject to gravity. Image credit: CountInfinity by Ananth. The strong nuclear force binds all the nuclei heavier than hydrogen together, the weak force is responsible for radioactive decays and the (incredibly rare) neutrino interactions, but the two you’re most familiar with are gravity and electromagnetism. Operating practically everywhere in the Universe, the two of them are the reason you can sit where you are right now as you read this.
Image credit: SPH4C Physics. Image credit: Donald E. BackofBeyond_02-copy1.png 800×800 pixels. Roger Penrose's New Idea: The Story and The Verdict : Starts With A Bang. “Nullius in Verba. (Take nobody’s word for it.)” -Motto of the Royal Society You know the drill. New ideas come out all the time. Sometimes they’re new theories, sometimes they’re old theories with a new twist, but regardless, we need to ask the question: How good is your theory?
For whatever it’s worth, I came up with a scale for this. The best ideas are beyond validated. Well, a couple of weeks ago, a new twist on an old idea was proposed by Roger Penrose. A little background first. Penrose diagrams — mathematical ways to map infinite spacetimes onto a simple sheet of paper — are named after him. Penrose has also been unafraid to put speculative ideas out there. We have a theory of the Universe, and while it doesn’t explicitly rule out cycles, the evidence strongly points towards a different story. Image credit: Ned Wright. Image credit: Ned Wright again. Now, we can use this “fingerprint” to learn about the Universe. Did Stephen Hawking write his initials in the microwave sky? La référence de l'actualité scientifique.
Science news. Découvrez l’arbre de l’année 2011 ! “L’arbre de l’année 2011″ a été dévoilé lors d’une cérémonie organisée à l’UNESCO *, le 24 novembre, dans le cadre de l’année internationale de forêts. L’occasion de mettre en lumière ces merveilles de la nature, et donner envie de les découvrir de nos propres yeux.
Organisée en deux phases, l’opération a tout d’abord recueilli 500 candidatures émanant de familles, de lycées, de communes, d’associations, de groupes scouts. Suite à une première sélection, les 26 arbres représentatifs de chacune des régions françaises retenus ont été présentés sur le site internet de l’événement, où le public a pu voter pendant deux mois pour son favori. Ainsi, dans la catégorie «Prix du public», c’est «l’arbre girafe» qui s’est distingué, obtenant la majorité des 20000 votes comptabilisés, qui est en fait un chêne pédonculé de la commune de Fouesnant (Finistère).
Cette exposition est en effet à l’initiative du photographe de Terre Sauvage, Emmanuel Boitier, qui est allé à la rencontre de ces 26 arbres. Photos sciences et environnement. Photo tungurahua : Pour l’heure, les autorités maintiennent l’alerte orange sur l’ensemble de la zone d'influence du volcan. Infographs.