How to find a black hole

first_img Landmark study signals shift in thinking about stem cell differentiation Since the 1960’s, physicists have been analyzing the theory of black holes and astronomers have been looking for examples in the universe.A black hole is a concentration of mass so enormous that it exhibits its own gravitational force. This force is so great, that nothing escapes from it. Researchers have found a method to find black holes and analyze their characteristics, such as their mass and gravitational force, to determine if they are in fact black holes.Astrophysicists first look for compact, massive, dark objects in the center of nearby galaxies. Then they use Newtonian physics and a series of equations to measure the mass and spin angle of the object. If the object is at least three times the mass of the sun, it is classified as a black hole. However, the mass of most objects found are 10 million times the mass of the sun.Current research focuses on finding yet more black holes and in particular, discovering if they contain event horizons. An event horizon is a one-way barrier that causes the isolation of the black hole’s interior from the outside universe. Matter, energy, information, and radiation, for example, can fall into the black hole, but nothing, not even light, can get out.For years, astronomers have been studying a huge, dark object in the center of the Milky Way Galaxy that affects the motion of the stars and gasses that are nearby.Infrared technology has been used to discover that there are stars orbiting this object. The mass of this object is 30 million times the mass of the sun. Most astrophysicists have accepted that this is a black hole in the center of the Milky Way Galaxy.Physicists and astronomers alike are working to find even more black holes in many different galaxies, and to find stronger evidence that they have event horizons.So it appears that the existence of black holes may not be such a mystery. However, the intrigue still remains at the thought of enormous black objects with masses at least 10 million times that of the sun.Could they be at the center of every galaxy?Reference:Narayan R. 2005. Black holes in astrophysics. New Journal of Physics. 7:199.Image: Max Planck Institute for Extraterrestrial PhysicsStory: by Gina Buss, Copyright PhysOrg.com This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. Citation: How to find a black hole (2005, October 20) retrieved 18 August 2019 from https://phys.org/news/2005-10-black-hole.htmlcenter_img Explore further Black holes. Just the name evokes mystery and intrigue. But do they really exist?Scientists have discovered at least 20 objects in 20 different galaxies that are potential black holes and may contain event horizons. A black hole may even be at the center of the Milky Way Galaxy.last_img read more

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Microsoft wants to send WebRTC standard to rehab

first_img WebRTC puts video chats all in the browser Microsoft wants to iron out the wrinkles in the existing WebRTC 1.0 proposal with a new approach. Microsoft is suggesting a new CU-RTC-Web standard. The CU-RTC Web stands for Customizable, Ubiquitous Real Time Communication over the Web.”Ubiquitous” is a standout concern. The WebRTC 1.0 standard falls short in an absence of “ubiquitous deployability” and that is one of the direct criticisms from Microsoft. “The standard does not show signs of interoperability with existing VoIP phones, and mobile phones, from behind firewalls and across routers and instead focuses on video communication between web browsers under ideal conditions.”Microsoft is not comfortable with the fact that the standard builds on the legacy of SIP, which does not make for a stateless system. Applications would be forced “to resort to trial-and-error and/or browser-specific code,” Microsoft says. Instead, its proposed system would dispense with the constraints imposed by “unnecessary state machines and complex SDP and provides simple, transparent objects.”The WebRTC standard, meanwhile, has gathered some fans if not Microsoft, namely support of Mozilla, Opera, Ericsson, Cisco, and other companies. According to reports, Firefox, Opera and Chrome have implemented WebRTC on some level for plugin-free VoIP and webcam chats.Microsoft wants to reduce some requirements that it sees holding the technology back. Microsoft takes issue with what is an overly prescriptive standard, asking too much of the network transport logic to be implemented by the browser. What is more, according to the critics at Microsoft, Web developers do not have enough wiggle room if they are looking to customize how their real-time communication services respond to changes in network quality. According to Microsoft’s blog posting on Monday, signed by key names at Skype as well as Microsoft, “A successful standard cannot be tied to individual codecs, data formats or scenarios. They may soon be supplanted by newer versions, which would make such a tightly coupled standard obsolete just as quickly. The right approach is instead to support multiple media formats and to bring the bulk of the logic to the application layer, enabling developers to innovate.”Microsoft makes its case that its proposal empowers developers to create applications that can take advantage of the benefits offered by real-time media in a clear, straightforward way. Since Microsoft now has Skype under its wing, inevitable observations are that its move to offer a standard proposal of its own suggests some sort of business motive against competition. Those who have examined the proposal, however, conclude that the suggestions are useful and of benefit for a final outcome. The changes are more about making technical improvements than staging a political maneuver, commented one site; another report said it found the Microsoft proposals well-reasoned. © 2012 Phys.org Explore further (Phys.org) — Microsoft is telling the W3C WebRTC working group that it has a better idea than the WebRTC standard which is still in progress and under revision. The goal has been to come up with a Web standard that will enable real-time audio and video conferencing on the Web without requiring any plugins. Now, though, Microsoft has submitted its own proposal for real-time communication to the WebRTC working group. The WebRTC specification is undergoing revision through this W3C WebRTC working group. Citation: Microsoft wants to send WebRTC standard to rehab (2012, August 8) retrieved 18 August 2019 from https://phys.org/news/2012-08-microsoft-webrtc-standard-rehab.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.last_img read more

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Trigger Warnings May Not Do Much Early Studies Suggest

first_imgThe warnings, which alert individuals to disturbing material, have been talked about, used and promoted on college campuses and elsewhere for more than a decade, but little was known about how well they work. Now, a pair of recent studies suggest that they may have little effect at all. For years, trigger warnings have been the subject of impassioned academic debate: Do they protect people from distress or encourage fragility? “Although people were distressed by the negative materials we showed them, they were no more or less distressed if they’d seen a trigger warning first,” said Mevagh Sanson of the University of Waikato in New Zealand, the lead author of one of the studies, published this month in Clinical Psychological Science, a journal of the Association for Psychological Science. Read the whole story: The New York Timeslast_img read more

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Drug peddling case US DEA agents interrogate Chinese nationals

first_imgKolkata: A team comprising officers from Drug Enforcement Administration (DEA), US Department of Justice, on Tuesday interrogated the five Chinese nationals, who were arrested from Kolkata Railway Station a few days ago, on charges of their involvement in a drug peddling racket.Criminal Investigation Department (CID) had arrested all five of them on June 30 and initiated a probe in this connection.Three officers of the DEA including one Indian went to Bhawani Bhavan, the CID headquarters, and interrogated the five arrested persons, who are in the custody of the CID till July 13. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedSources said the interrogation continued for around four long hours and the investigating officers from theUS questioned the arrested persons to know different aspects of their drugsmuggling racket. As there was a language barrier, an interpreter was there to help in smoothinterrogation.It is learnt that officers of the Narcotics Control Bureau (NCB) also interrogated all five of them and the agency may have taken them in their custody to get more information from them. Also Read – Naihati: 10 councillors return to TMC from BJPSources said the arrested Chinese nationals were asked to reveal the modus operandi they had taken up to successfully carry on with the smuggling of drugs that include methamphetamine andamphetamine. As all five of them are from Guandong province of China, the investigating officers are trying to unearth how far they had managed to spread the tentacles of their racket.It was on July 4, when a team comprising senior officers of the CID had unearthed a factory run by the Chinese to produce narcotic substances at Naoda in Murshidabad.The investigating officers of CID had come to know about the factory at Naoda after arresting the Chinese nations – Wang Zio Dong, Zeu Gong Hue, Chang Heu, Lee Chand and Lue Bouk Seoung. Around 197 kg drug was recovered from them and according to a police officer, it was worth Rs 39 crore.The investigating officers also came to know from locals that the arrested people used to run a factory on a 15-bigha land saying that they produce charcoal from jute stick. But it was closed down a few months ago.The CID officers had found some bags in the factory that was suspected to be used for packing drugs.last_img read more

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Tripartite talks fail Joint Forum calls for 3day bandh of all tea

first_imgDarjeeling: With the tripartite talks failing in Uttar Kanya, the Joint Forum of Tea Trade Unions have called for a three-day bandh of all tea estates in Terai and Dooars in the plains and stopping of tea dispatch in all the tea gardens of the Hills. They also started a sit-in demonstration inside the Uttar Kanya compound in the Jalpaiguridistrict, which was lifted after assurance from the assistant labour commissioner that the meeting would continue on Tuesday. Also Read – Rain batters Kolkata, cripples normal lifeIncidentally, the tea trade unions have been demanding the implementation of minimum wages in the tea gardens. A minimum wage advisory committee was also constituted by the government in 2015. Several meetings have been held since then to resolve the issue.Tripartite talks between the state government, management and tea trade unions was held in Uttar Kanya, the mini secretariat in Jalpaiguri on Monday.”From the government’s side, we proposed a minimum wage amount of Rs 172. As per the demand of the trade unions, we had reviewed and increased the food basket and clothing component as the earlier rates were of 2014. There has been a 56% increase of these components, resulting in the increase from Rs 158 to Rs 172,” stated Jawaid Akhtar, labour commissioner, who is the member secretary of the minimum wage advisory committee. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedThe labour commissioner stated that a group of trade unions have put forward fresh proposals like decreasing the amount of rice grains being given and instead add the cost of fruits in the food basket.”They have proposed a new rate. We have to review this rate, discuss it with the government and then continue talks. Another round of talks will be held on August 20 in Kolkata, where other components like medical and housing will be discussed. Some trade unions were satisfied with this and have confirmed their participation for the August 20 talks,” added the labour commissioner. He, however, did not want to disclose the rate put forward by the Union. The Joint Forum has proposed an amount of Rs 239. The Joint Forum had sat on a dharna immediately after the meeting ended at around 3:40 pm, demanding that the meeting continues.”All tea gardens in the plains will be closed for the next three days. Tea dispatch will be stopped in the Hills. The dharna in Uttar Kanya will continue and tea garden workers from the Hills and the plains in masses will march to Uttar Kanya to join the dharna from Tuesday,” stated Zia Ur Alam, convenor of the Joint Forum, a conglomeration of 26 tea trade unions.last_img read more

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Health condition of veteran singer Dwijen Mukhopadhyay shows signs of improvement

first_imgKolkata: The health condition of singer Dwijen Mukhopadhyay, who was admitted to SSKM Hospital on Saturday following some respiratory distress, has improved. He has, however, been kept under observation at a cabin of Woodburn block.The doctors at the hospital were concerned over the health condition of the veteran singer.According to hospital sources, the patient had responded to medicines as showed significant improve in his health condition in the Also Read – Rain batters Kolkata, cripples normal lifepast two days.Mukhopadhyay was brought to the hospital on Saturday afternoon after he had complained of respiratory distress and fever. As a result of this, his family members decided to take him to hospital on Saturday.After his treatment was started, the doctors found that he had been suffering from pneumonia. According to hospital sources, the patient has various age related ailments including high blood pressure, blood sugar, osteoarthritis. The veteran singer has been a chronic patient of COPD.It may be mentioned that Mukhopadhyay was earlier admitted to SSKM Hospital a month ago with same ailments and was later released from the hospital after a few days.According to a senior official of SSKM Hospital, the patient’s condition is stable but he will be kept under observation.last_img read more

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Chetla Alapi Clubs Durga Puja to represent Patuli floating market

first_imgKolkata: Kolkatans who have not been able to visit the floating market at Patuli as yet will get a chance to witness the same during Durga Puja.Thanks to Chetla Alapi Club in South Kolkata which seeks to represent the floating market at Patuli at Chetla through its theme — ‘Jale Bazaar’ (Market on Water).”The state government under the leadership of Chief Minister Mamata Banerjee has undertaken several schemes for all round development of people in the state. Every year, we try to highlight the development projects of our government through various Durga Puja themes. This is an effort on our part to enliven the floating market which has already emerged as a major tourist attraction,” said Anirban Chatterjee, secretary and theme maker of Chetla Alapi Club. The pandal will de decked up with models of eight small boats which will give the impression of seller-customer dealing in the market. “Space crunch is a barrier for us but we have been working hard for the last three months to make it look as real as possible. We are hopeful people will appreciate our endeavour,” a member of the Chetla Alapi Club said. Also Read – Rain batters Kolkata, cripples normal lifeThe idol of Devi Durga along with Lakshmi, Saraswati, Kartick and Ganesh will be seated on a model of boat, giving impression that the goddess is coming riding a boat to make the world free from demonic forces.It may be mentioned that the floating market at Patuli was inaugurated by Chief Minister Mamata Banerjee from a government programme in the city following which state Urban Development and Municipal Affairs minister Firhad Hakim visited the market.The floating market, the first of its kind in the country, has 228 sellers sitting on 114 boats selling everything ranging from fish, chicken, mutton eggs, vegetables, fruits to flowers, grocery and other miscellaneous items. Wooden walkways supported by wooden beams have been constructed for shoppers and shopkeepers to approach the boats. A shopper stands on the walkway and collect items from the boats.last_img read more

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Reports on starvation deaths in Bengal are fabricated Mamata

first_imgKolkata: Days after news of alleged starvation deaths in West Bengal appeared in a section of the media, Chief Minister Mamata Banerjee on Tuesday refuted the reports as “fabricated”, saying the deaths either resulted from “age-related ailments” or “excessive liquor consumption”. Last week, media reports had suggested that seven people of Sabar community, in Jungle Mahal area of Jhargram district, died due to starvation. In her address to the Assembly, Banerjee said the state government provides foodgrain to “every poor person” in the state. Also Read – Rain batters Kolkata, cripples normal life “The reports that people from Sabar community have died due to starvation is absolutely false and fabricated. No one has died in Bengal due to starvation. We provide free rice and wheat to each and every poor person in this state – from the hills in the north to Jungle Mahal in the south,” she stated. Sabar community is an ethnic tribe, mainly found in Jharkhand, Chhattisgarh, Madhya Pradesh and West Bengal. “People have died in Jungle Mahal due to excessive consumption of liquor or age-related ailments. While two people have died of illness and old age, others have died due to liver problems caused by excessive consumption of liquor,” she asserted. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killed Listing the development projects taken up for the welfare of tribal communities, the CM said the state has always been sensitive to the needs of the poor. Meanwhile, the legislators of opposition CPI(M) and the Congress staged a walkout from the assembly as their demand for a detailed discussion on alleged Sabar community deaths was rejected, following the chief minister’s unilateral statement on the issue. “The state government is afraid to hold a discussion, adhering to assembly rules, as it will unveil many secrets, giving us an opportunity to question the government. That is why the CM unilaterally gave a statement,” Leader of opposition Abdul Mannan said.last_img read more

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Govt committed to welfare of residents says Mamata

first_imgKolkata: The state government is committed to the welfare of its people, Chief Minister Mamata Banerjee asserted Wednesday.The Chief Minister, on the occasion of Universal Health Coverage Day, said all government-run hospitals and health centres provide treatment for free to those in need. “Today is Universal Health Coverage Day. In #Bangla, healthcare is free at govt hospitals and health centres. We have also set up fair-price medicine shops and diagnostic centres, ICCUs, HDUs, CCUs, mother & child hubs and more. We are committed to the welfare of all,” she tweeted. Universal Health Coverage (UHC) Day, observed every year on December 12, marks the anniversary of the first unanimous United Nations resolution calling for countries to provide affordable and quality healthcare to every person.last_img read more

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Madame Tussauds all set to dazzle Delhi

first_imgIndia prepares for the world’s largest and most renowned entertainment operators – Merlin Entertainments, to open their doors to the most aspiring and awe-inspiring attractions on this planet. Madame Tussauds, the legendary wax attraction entertainment hotspot is soon to launch in New Delhi and will be the latest tourist and locals’ experiential zone. The dazzling entertainment zone, uniquely planned for visitors to interact with their favourite stars and figures of inspiration is set to launch in early summer of 2017. Located in the heart of Delhi – Connaught Place at Regal Cinema, the team is thrilled about the exhilarating experience they are about to embark on. Merlin Entertainments is committed to bringing lifetime experiences, which influence people, and Madame Tussauds is a testimony to their global reach. Also Read – Add new books to your shelfThis is the 23rd edition of Madame Tussauds, and the Merlin Entertainment team is gearing for a red carpet welcome. The first ever Madame Tussauds is all set to spellbind the Indian audiences by showcasing a wide array of influential icons from across the globe, who have thrived to inspire us through their stunning performances on the reel and real life while making a great contribution towards shaping the world. India, known for her diverse entertainment industry, heritage, and glittering Bollywood star-studded figures will become an “iconic attraction.” The wax attraction will exhibit over 50 figures from diverse leagues such as history, sport, music, film, and TV. Each wax figure is created with the expertise of over 20 international and local artists working at a time to ensure an authentic visitor experience. Also Read – Over 2 hours screen time daily will make your kids impulsiveMr. Anshul Jain, General Manager, and Director, Merlin Entertainments India Pvt Ltd said, “We are more than delighted to inform you that we are in the final phase of launching Madame Tussauds in Delhi. The Wax Attraction will provide an immersive and exhilarating experience of the glittering world of renowned celebrities and personalities, from Prime Minister  Narendra Modi, God of Cricket Mr Sachin Tendulkar to glamourous divas like Kim Kardashian for the Indian audience. We will also have a broader focus on Indian celebrities, I am sure that all the locals and tourists will cherish meeting their idols who have influenced their lives in different ways.”Madame Tussauds, Delhi will be an attraction that truly represents the fascinating world of politics, glamour, sport, and music, through planned themes and interactive platforms. Visitors can interact with the life-like figures of the celebrities fulfilling their dreams of being up close and personal with their favourite icons.last_img read more

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