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Google has announced a major update that will see thousands – potentially even millions – of accounts permanently deleted if they have not been used since 2021. The purge will include Gmail, Drive and Photos accounts that have not been used or signed into for at least two years. In a blog post announcing the update, Google said the new policy was primarily for security reasons, as older accounts are typically more vulnerable to threats like spam, phishing scams and hijacking. “Our internal analysis shows abandoned accounts are at least 10x less likely than active accounts to have 2-step verification set up,” the post stated. “Meaning, these accounts are often vulnerable, and once an account is compromised, it can be used for anything from identity theft to a vector for unwanted or even malicious content, like spam.” The policy will only apply to personal accounts, with those associated with organisations like schools and businesses safe from being deleted. The tech giant said the update will be in effect from this week, however no accounts will be deleted until December 2023. “We will take a phased approach, starting with accounts that were created and never used again,” Google wrote. “Before deleting an account, we will send multiple notifications over the months leading up to deletion, to both the account email address and the recovery email (if one has been provided).” Users can avoid being caught up in the purge by doing as little as reading an email sent to the account, or watching a YouTube video while logged in. Google hosts billions of user accounts, though it did not make public how many of them are inactive. It follows similar announcements from Twitter, with chief executive and owner Elon Musk recently rolling out a similar policy that will see usernames recycled if they are associated with accounts that have not been used “for several years”. Read More ‘Google is done’: World’s most powerful AI chatbot offers human-like alternative to search engines

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Earth has been hit by a blast from a dead star so energetic that scientists cannot explain it. The burst of gamma rays, originating in a dead star known as a pulsar, is the most high energy of its kind ever seen. It was equivalent about ten trillion times the energy of visible light, or 20 tera-electronvolts. Scientists are unable to explain exactly what kind of a scenario could lead a pulsar to emit such intense energy, and the researchers behind the breakthrough say that it “requires a rethinking of how these natural accelerators work”. Scientists hope that they can find yet more powerful energy blasts from pulsars, with a view to better understanding how they are formed. Pulsars are formed when a star dies, exploding in a supernova and leaving behind a tiny, dead star. They are just 20 kilometres across, and spin extremely fast with a powerful magnetic field. “These dead stars are almost entirely made up of neutrons and are incredibly dense: a teaspoon of their material has a mass of more than five billion tonnes, or about 900 times the mass of the Great Pyramid of Giza,” said Emma de Oña Wilhelmi, a scientist at the High Energy Stereoscopic System observatory in Namibia that detected the blast. As pulsars spin, they throw out beams of electromagnetic radiation, throwing it out like a cosmic lighthouse. That means that someone in one spot – like the Earth – will see the radiation pulses flash in a regular rhythm as they spin past. The radiation is thought to be the result of fast electrons that are produced and thrown out by the the pulsar’s magnetosphere, which is made up of plasma and electromagnetic fields that surround the star and spin with it. Scientists can search the radiation for different energy bands within the electromagnetic spectrum, helping them understand it. When scientists previously did that with the Vela pulsar examined in the new study, they found that it was the brightest everseen in the radio band, and the brightest persistent source in the giga-electronvolts. But the new research found that there is a part of the radiation with even more high energy components. “That is about 200 times more energetic than all radiation ever detected before from this object,” said co-author Christo Venter from the North-West University in South Africa. Scientists don’t know exactly how that could happen. 
“This result challenges our previous knowledge of pulsars and requires a rethinking of how these natural accelerators work,” says Arache Djannati-Atai from the Astroparticle & Cosmology (APC) laboratory in France, who led the research. “The traditional scheme according to which particles are accelerated along magnetic field lines within or slightly outside the magnetosphere cannot sufficiently explain our observations. “Perhaps we are witnessing the acceleration of particles through the so-called magnetic reconnection process beyond the light cylinder, which still somehow preserves the rotational pattern? But even this scenario faces difficulties to explain how such extreme radiation is produced.” An article describing the findings, ‘Discovery of a Radiation Component from the Vela Pulsar Reaching 20 Teraelectronvolts’, is published today in the journal Nature Astronomy. Read More ‘Ring of fire’ solar eclipse this month will be last until 2046 Mystery behind massive star suddenly vanishing decoded New discovery is ‘holy grail’ breakthrough in search for aliens, scientist say ‘Ring of fire’ solar eclipse this month will be last until 2046 Mystery behind massive star suddenly vanishing decoded New discovery is ‘holy grail’ breakthrough in search for aliens, scientist say