New Type of Star Emerges From Inside Black Holes — The Physics arXiv Blog Black holes have fascinated scientists and the public alike for decades. There is special appeal in the idea that the universe contains regions of space so dense that light itself cannot escape and so extreme that the laws of physics no longer apply. What secrets can these extraordinary objects hide? Today, we get an answer thanks to the work of Carlo Rovelli at the University of Toulon in France, and Francesca Vidotto at Radboud University in the Netherlands. These guys say that inside every black hole is the ghostly, quantum remains of the star from which it formed. And that these stars can later emerge as the black hole evaporates. Rovelli and Vidotto call these objects “Planck stars” and say they could solve one of the most important questions in astrophysics. Black holes arise naturally from Einstein’s theory of general relativity which predicts that gravity influences the trajectory of photons moving through space. But this has never been entirely satisfactory.
Black Holes Feed On Quantum Foam, Says Cosmologist — The Physics arXiv Blog If Spaans is right, black holes grow by feeding on spacetime itself and their quantum feeding habits effectively solve the problem of how the biggest black holes become so massive, so quickly. “Supermassive black holes can acquire a lot of their mass through these quantum contributions over the life time of the universe,” he says. Here’s some useful background. In 1955, the American theoretical physicist John Wheeler suggested that at very small length scales, virtual particles, including quantum black holes, must constantly jump in and out of existence creating a kind of foamy structure that is very different from the smooth spacetime we see at larger scales. Nobody has ever observed quantum foam but there is widespread agreement that the fabric of the universe must be made of something like it. In ordinary circumstances, quantum foam has little impact. Spaans’ approach is to ask what happens when a black hole meets quantum foam. And that ought to be measurable.
Marvin Gaye - Inner City Blues ( nicolas Jaar remix) I am single, simple and innocent person who want to... Structure (Click here to learn about how to USE the past simple) It's similar to the present simple because it has different rules for the verb 'be', which becomes 'was' or 'were': The Past Simple with 'be' Here's how to make the positive: To make the negative with 'be', just add 'not': Here's an exercise to practise the positive and negative forms with 'be' To make a question, just like the present simple, we change the position of 'was / were' and the subject. Here are the past simple 'yes / no' questions with 'be': And the 'wh' questions with 'be' (the question word just goes at the beginning, everything else is the same): And here's an exercise for 'wh' and 'yes / no' questions Here's another exercise with 'be' (this time it's all forms - positive, negative and questions) The Past Simple (Simple Past) with Other Verbs We make the past simple just like the present simple except we use 'did' instead of 'do / does'. The positive: We usually make the positive by adding '-ed' to the infinitive.
Mohandas Karamchand Gandhi - Wikiquote, le recueil de citations libre Citations « Mohandas Karamchand Gandhi » sur Wikiquote, le recueil de citations libre Gandhi Mohandas Karamchand Gandhi, né à Porbandar, Goujerat le 2 octobre 1869, mort à Delhi le 30 janvier 1948, était un dirigeant politique, guide spirituel important de l'Inde et du mouvement pour l'indépendance de ce pays. Il est communément connu et appelé en Inde et dans le monde comme Mahatma Gandhi (du sanskrit, Mahatma: grande âme), voire simplement Gandhi ou Bapu (Père dans beaucoup de langues de l'Inde). Citations[modifier] Je voulais mieux connaître la vie de celui (Mahomet) qui aujourd'hui détient indiscutablement les cœurs de millions d'êtres humains. (en) I wanted to know the best of the life of one who holds today an undisputed sway over the hearts of millions of mankind. Je ne chercherai pas à défendre davantage ma thèse. C'est une calomnie de parler de sexe faible à propos d'une femme. Gandhi (trad. Je veux développer chez l'enfant ses mains, son cerveau et son âme. Gandhi (trad.
Malala's journey from near death to recovery Malala Yousafzai returns to school for the first time at Edgbaston High School for Girls in Birmingham, England, on March 19. The 15-year-old said she had "achieved her dream." Malala was one of seven people featured on the cover of Time's 100 most influential people edition of the magazine in April. The teen was discharged from Queen Elizabeth Hospital in Birmingham, England, in February. Malala Yousufzai, 15, reads a book on November 7 at the hospital. Malala talks with her father, Ziauddin. Malala sits up in bed on October 25 after surgery for a gunshot wound to the head. Malala recovers at Queen Elizabeth Hospital on October 19 after being treated. Pakistani hospital workers carry Malala on a stretcher on October 9 after she was shot in the head by the Taliban in Mingora. Malala's road to recovery (CNN) -- It began with a ride home from school on Tuesday, October 9. Some of the girls pointed her out. The bus driver hit the gas. Malala was left in critical condition. Army Chief Gen. U.S.
Pakistan's Malala: Global symbol, but still just a kid Malala Yousufzai's father, an educator, taught her to stand up for her rightsIn 2009, the Taliban issued an edict that all girls in her region be banned from schoolsMalala spoke out, blogged and appeared in a documentary, refusing to follow their ordersAfter a 2010 meeting with a top diplomat, she wanted ice cream, revealing she was still just a kid (CNN) -- Eleven-year-olds sometimes have trouble sleeping through the night, kept awake by monsters they can't see. But Malala Yousufzai knew exactly what her monsters looked like. They had long beards and dull-colored robes and had taken over her city in the Swat Valley, in northwestern Pakistan. It was such a beautiful place once, so lush and untouched that tourists flocked there to ski. But that was before 2003, when the Taliban began using it as a base for operations in nearby Afghanistan. Read more: One girl's courage in the face of Taliban cowardice The Taliban believe girls should not be educated, or for that matter, even leave the house.
Brave New World with Stephen Hawking Professor Stephen Hawking presents a global exploration of the scientific breakthroughs that are transforming our lives in the 21st century. With the help of some of the world's leading scientific figures - including Sir David Attenborough, Richard Dawkins, Aarathi Prasad, Lord Winston and Maggie Aderin-Pocock - this five-part series reveals how science is striving for humankind's next leap forward. Machines. Health. Technology. Environment. Biology. Watch the full documentary now (playlist - 2 hours, 18 minutes) Only three episodes are available at this moment. Stephen Hawking’s Universe Stephen Hawking's Universe is an astronomical documentary from 1997 made for the Public Broadcasting Service featuring the theoretical physicist Stephen Hawking. The author of the bestselling A Brief History of Time, presents here some of the most astonishing scientific advances in cosmological thought. Interviews with renowned researchers combined with strikingly artistic cinematography set the stage for this down-to-earth production on the mysteries of our universe. Relive the ingenuity of Ptolemy, Copernicus, Kepler, Galileo, Newton, Hubble, and Einstein in Seeing Is Believing. Despite diagnosis with ALS, Hawking completed his Ph.D., developing a theory describing the precise conditions for the Big Bang. The history of chemistry, the periodic table, and Curie's radiation experiments in Cosmic Alchemy allowed Einstein's theory of relativity and revelations about the relationship between energy and matter. This documentary is available for preview only.