Scientists have “heard” a chorus of gravitational waves rippling through the universe, in what they say is an unprecedented finding that could fundamentally change our understanding of the universe. The discovery, described in a range of newly published journal papers, suggests that spacetime is being rocked by intensely powerful gravitational waves all the time. Those waves carry a million times more energy than the one-off bursts of gravitational waves that were detected from a black hole and were themselves hailed as a major breakthrough in our understanding of the universe. The new results suggest that everything is being slowly shrunk and expanded by a new kind of gravitational wave as they pass through our galaxy. Scientists describe it as being akin to hearing a “symphony” of waves echoing through the universe. “It’s like a choir, with all these supermassive black hole pairs chiming in at different frequencies,” said Chiara Mingarelli, a scientist who worked on the new findings while an associate research scientist at the Flatiron Institute’s Center for Computational Astrophysics. “This is the first-ever evidence for the gravitational wave background. We’ve opened a new window of observation on the universe.” The new findings have been described in a range of journal articles, published in different academic journals. The research is the result of 25 years of observations from six of the world’s most sensitive radio telescopes, and have been simultaneously published by different collaborations across the world. The findings are not only notable in themselves. They also offer the opportunity to find out some of the universe’s secrets, since they can be used to find information about the binary black holes that form when galaxies merge, for instance. “These results signify the beginning of an exciting journey into the Universe, where we aim to unravel its mysteries,” Michael Keith, a lecturer at Jodrell Bank Centre for Astrophysics, UK, and contributor to one of the new studies, published in Astronomy and Astrophysics. “After decades of tireless work by hundreds of astronomers and physicists worldwide, we are finally detecting the long-awaited signature of gravitational waves originating from the distant Universe.” Scientists made the discovery by analysing observations of pulsars, which are extinguished stars that can be used as reliable clocks in the distant universe. By bringing together such a large amount of detailed data, researchers were able to measure those pulsars with very high accuracy, allowing them to measure gravitational waves at a far larger scale than using detectors on Earth. “Pulsars are excellent natural clocks. We exploit the remarkable regularity of their signals to detect subtle changes in their rhythm, enabling us to perceive the minute stretching and squeezing of space-time caused by gravitational waves originating from the far reaches of the Universe,” said David Champion, a senior scientist at the MPIfR in Bonn, Germany, and contributor to the study, in a statement. For now, researchers are only able to “hear” the vast choir, rather than the individual pulsars that make up its singers. But together they are much louder than expected, meaning that there may be more or more heavy supermassive black holes to be found in the universe. Read More Astronomers find zombie planet that ‘shouldn’t exist’ Nasa to begin Moon mining within next decade Nasa rover spots bizarre donut shaped rock on Mars

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Google has warned users that their Gmail accounts may start to be deleted. The company says it is giving affects users plenty of time to ensure they are able to secure any accounts they want to retain access to. The mass deletion will begin at the start of December, and apply only to inactive accounts. The company says it is doing so for safety, since old accounts may represent a security risk. Google considers an account to be inactive if people do not log in within two years. Logging in includes not only looking at the Gmail inbox but also using that same login to watch YouTube or make Google searches, or downloading apps from the Play Store. Accounts that have money in them in the form of gift cards will also be kept open, Google has said. Google warned in May that it would start deleting accounts. It said that it was doing so because those inactive accounts were more likely to be compromised, and could be used for other online crime. “This is because forgotten or unattended accounts often rely on old or re-used passwords that may have been compromised, haven’t had two factor authentication set up, and receive fewer security checks by the user,” said Ruth Kricheli, Google’s vice president for product management, at the time. “Our internal analysis shows abandoned accounts are at least 10 times less likely than active accounts to have 2-step-verification set up.” Those attackers can then use that account to send spam email or steal people’s identities, the company warned. But it is now sending emails to those affected, giving them a warning that they could soon lose access to their account, noted Bleeping Computer. It tells users that it is doing so “to protect your private information and prevent any unauthorized access to your account even if you’re no longer using our services”. The messages will be sent not only to the actual Gmail account in question, but also to any recovery email addresses that have been provided. Users will given at least eight months’ warning before their accounts are removed, Google says. Once an account is deleted, the email associated with it will no longer be eligible for use, so that people will not be able to steal old and now recovered addresses.

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