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A new view of a supermassive black hole marks the first time astronomers have captured and mapped polarisation, a sign of magnetic fields, so close to the edge of a black hole.
Images released by the Event Horizon Telescope (EHT) collaboration revealed how the black hole, some 55 million light-years away at the center of galaxy M87 appears in polarised light.
The EHT collaboration involves more than 300 researchers from Africa, Asia, Europe, North and South America. Scientists still do not understand how magnetic fields — areas where magnetism affects how matter moves — influence black hole activity. Do they help direct matter into the hungry mouths of black holes? Can they explain the mysterious jets of energy that extend out of the galaxy’s core?
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In two studies published in The Astrophysical Journal Letters, EHT astronomers revealed their latest findings and how magnetic fields may be influencing the black hole at the center of M87.
“One of the main science drivers of the EHT is distinguishing different magnetic field configurations around the black hole,” said Angelo Ricarte, a co-author and researcher at the Center for Astrophysics; Harvard and Smithsonian.
“Polarisation is one of the most direct probes into the magnetic field that nature provides.”
The EHT collaboration has been studying the supermassive object at the heart of M87 for well over a decade. In April 2019, the team’s hard work paid off when they revealed the very first image of a black hole. Since then, scientists have delved deeper into the data, discovering that a significant fraction of the light around the M87 black hole is polarised.
Light becomes polarized when it goes through certain filters, like the lenses of polarised sunglasses, or when it is emitted in hot regions of space that are magnetized. In the same way, polarised sunglasses help us see better by reducing reflections and glare from bright surfaces, astronomers can sharpen their view of the black hole by looking at how light originating from there is polarised. Specifically, polarisation allows astronomers to map the magnetic field lines present around the inner edge of the black hole.
“In order to gain confidence in our analysis, we used as many as five distinct methods to calibrate the data and reconstruct polarimetric images,” said Maciek Wielgus, a researcher at Harvard’s Black Hole Initiative and the Center for Astrophysics (CfA) who participated in the study.
“This huge team effort paid off as we found very good consistency between results obtained with all the different techniques.” To observe the heart of the M87 galaxy, the EHT collaboration linked eight telescopes around the world, including the Smithsonian Astrophysical Observatory’s Submillimeter Array, to create a virtual Earth-sized telescope. (IANS/SP)
Microsoft has disrupted the activities of a China-based hacking group, gaining control of the malicious websites the group used to attack organisations in the US and 28 other countries around the world.
The Microsoft Digital Crimes Unit (DCU) said in a statement that a federal court in Virginia granted its request to seize websites of the hacking group called 'Nickel', enabling the company to cut off Nickel's access to its victims and prevent the websites from being used to execute attacks.
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"We believe these attacks were largely being used for intelligence gathering from government agencies, think tanks and human rights organisations," said Tom Burt, Corporate Vice President, Customer Security and Trust at Microsoft.
Obtaining control of the malicious websites and redirecting traffic from those sites to Microsoft's secure servers will help the company protect existing and future victims while learning more about Nickel's activities.
Also Read : Fortnite : A Gold Mine for Hackers
"Our disruption will not prevent Nickel from continuing other hacking activities, but we do believe we have removed a key piece of the infrastructure the group has been relying on for this latest wave of attacks," Burt said late on Monday.
To date, in 24 lawsuits - five against nation-state actors -- Microsoft has taken down more than 10,000 malicious websites used by cybercriminals and nearly 600 sites used by nation-state actors.
"We have also successfully blocked the registration of 600,000 sites to get ahead of criminal actors that planned to use them maliciously in the future," the tech giant informed.
"We believe these attacks were largely being used for intelligence gathering from government agencies, think tanks and human rights organisations."Unsplash
In some observed activity, Nickel malware used exploits targeting unpatched on-premises Exchange Server and SharePoint systems.
"However, we have not observed any new vulnerabilities in Microsoft products as part of these attacks. Microsoft has created unique signatures to detect and protect from known Nickel activity through our security products, like Microsoft 365 Defender," the company noted.
Nickel has targeted organisations in both the private and public sectors, including diplomatic organisations and ministries of foreign affairs in North America, Central America, South America, the Caribbean, Europe and Africa. (IANS/SP)
(Keywords : hacking, China, Microsoft, website, victim, intelligence, attack, malicious, traffic, server, company, disruption, lawsuits, cybercriminals, vulnerability.)
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Chip manufacturer MediaTek on Monday announced that it is focused on making 2022 a year aimed at rapid growth, business success, substantial expansion in Research and Development capabilities.
MediaTek's plans to boost technology democratisation and enable access to disruptive connectivity with its range of mainstream to flagship 5G chips.
"We at MediaTek are focused on making 2022 a year aimed at rapid growth, business success, and substantial expansion in our R&D capabilities. For 2022, we are focused on further strengthening our presence in India, offering incredible experiences to customers, and supporting the country's technology initiatives with our expertise and collaboration with leading OEMs," Anku Jain, Managing Director, MediaTek India said in a statement.
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In the flagship segment, MediaTek recently announced the Dimensity 9000 chip, which is a milestone of innovation and a rise to the incredible, built-to-power flagship 5G smartphones in the world, the company claims.
MediaTek Dimensity 9000 features a single Cortex-X2 performance core clocked at 3.05GHz, three Cortex-A710 cores at 2.85GHz and four Cortex-A510 efficiency cores at 1.8GHz.
It packs a 10-core Arm Mali-G710 that takes care of graphics processing, the report said.
The chipset also comes packed with MediaTek's fifth-generation APU with six total cores for AI processing.Unsplash
Also read: Realme Unveils First 5G Smartphone
The chipset also comes packed with MediaTek's fifth-generation APU with six total cores for AI processing.
The chipset can handle screens with up to a 180Hz refresh rate at Full HD+ resolutions. It is also the first chipset to have an 18-bit image signal processor, offering the ability to capture 4K HDR video using up to three cameras at the same time, or still photos using up to a massive 320MP sensor. (IANS/PR)
(Keywords: 5G, smartphones, Mediatek)
If the US loses Chinese companies, Wall Street will gradually alienate itself from the world's most prosperous market and the US will no longer be the true global financial centre, Chinese state media claimed.
Didi Chuxing, the Chinese ride-hailing giant, announced on Friday that the company is starting the work of delisting from the New York Stock Exchange (NYSE) and initiating preparations for listing in Hong Kong.
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One day before Didi made the statement, the US Securities and Exchange Commission (SEC) issued a mandate requiring foreign companies listed in the US to provide audits for inspection. Otherwise, they could be delisted from NYSE and Nasdaq in three years.
"The new SEC regulation clearly targets Chinese companies listed in the US. Analysts believe that it could lead to more than 200 companies being kicked off US exchanges," Global Times reported.
Also Read : The forgotten Indo-China War
Didi is the first Chinese company, which announced that it would delist from the NYSE after the SEC issued its new regulation. The company got listed in the US in June without the approval of Chinese regulatory authorities, sparking concerns that the information of hundreds of millions of Chinese users would be leaked to endanger China's national security. More than 20 apps linked to the company were subsequently removed from mobile stores. The SEC's new regulation has compressed Didi's space for financing in the US from the other direction, the report said.
It will become more difficult for Chinese digital technology and application companies to get listed in the US in the future.Unsplash
There have already been voices in the US demanding most of the "China concept stocks" be removed from the US. Scrutiny of "China concept stocks" is expected to get stricter. The US provides various excuses such as "financial security" and "national security" for such scrutiny, the report said.
It will become more difficult for Chinese digital technology and application companies to get listed in the US in the future. This will cause losses to both sides. But the tendency shows that China has greater initiative to adjust and adapt to new conditions, the report said.
Global Times said Chinese companies have other alternatives, and if they go back to China, they will greatly enhance the attractiveness of the mainland and Hong Kong capital markets, creating the possibility of gradually changing the global financial landscape. (IANS/SP)
(Keywords : Wall street, China, stocks, companies, businesses, losses, regulations, prosperous, technology, authorities, delisting.)
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