The biggest explosion ever seen has been spotted in space – and scientists don’t know for sure where it came from. The blast was brighter than almost anything ever seen and has been going on for years, making it by far the most powerful such event witnessed by scientists. It has been ongoing for more than three years, and took place nearly 8 billion years away. Astronomers have proposed a host of possible explanations for the blast: it may be a vast cloud of gas that was torn apart by a black hole, for instance. But nothing on such a scale has ever been seen before and the explosion may have come from something else entirely. It is more than 10 times brighter than any known supernova and three times brighter than the brightest tidal disruption event, where a star falls into a supermassive black hole. The explosion, known as AT2021lwx, took place when the universe was around six billion years old, and is still being detected by a network of telescopes. The astronomers, led by the University of Southampton, believe the explosion is a result of a vast cloud of gas, possibly thousands of times larger than our sun, that has been violently disrupted by a supermassive black hole. Fragments of the cloud would be swallowed up, sending shockwaves through its remnants, as well as into a large dusty “doughnut” surrounding the black hole. Such events are very rare and nothing on this scale has been witnessed before, the researchers say. Last year, astronomers witnessed the brightest explosion on record – a gamma-ray burst known as GRB 221009A. Although this was brighter than AT2021lwx, it lasted for just a fraction of the time, meaning the overall energy released by the AT2021lwx explosion was far greater. AT2021lwx was first detected in 2020 by the Zwicky Transient Facility in California, and subsequently picked up by the Asteroid Terrestrial-impact Last Alert System (ATLAS) based in Hawaii. But until now the scale of the explosion had been unknown. Dr Philip Wiseman, research fellow at the University of Southampton, who led the research, said: “We came upon this by chance, as it was flagged by our search algorithm when we were searching for a type of supernova. “Most supernovae and tidal disruption events only last for a couple of months before fading away. For something to be bright for two plus years was immediately very unusual.” The Southampton-led team believe the most feasible explanation for what caused the explosion is an extremely large cloud of gas (mostly hydrogen) or dust that has come off course from its orbit around the black hole and been sent flying in. Dr Wiseman added: “With new facilities, like the Vera Rubin Observatory’s Legacy Survey of Space and Time, coming online in the next few years, we are hoping to discover more events like this and learn more about them. “It could be that these events, although extremely rare, are so energetic that they are key processes to how the centres of galaxies change over time.” The findings are published in Monthly Notices of the Royal Astronomical Society. Additional reporting by agencies Read More Scientists think they have explained a ‘mysterious structure in the universe’ Astronomers spot the largest cosmic explosion ever seen Astronomers see ‘objects that no one has ever seen before’ in incredible observations Astronomers spot the largest cosmic explosion ever seen Astronomers see ‘objects that no one has ever seen before’ in incredible observations ‘Meteorite? shooting star? missile?’: Officials explain strange ‘fireball’ over Japan

Very few new users were attracted by the anticipated launch of Twitter rival Threads’ web application, new data suggests. Instagram’s Threads, launched in early July, swiftly became the fastest-growing app in the world and initially posed as a legitimate rival to Elon Musk’s platform Twitter, now rebranded as X. Though launched without key features of its rival, its early strategic roll out at a key time when Twitter was facing widespread backlash for policy changes under Mr Musk helped Threads quickly accumulate users. But weeks since its launch, Threads lacked one of the most basic features of social networks – to be able to use it outside of an app. Last week, the Threads web app was finally rolled out, with the platform’s chief and Instagram boss Adam Mosseri announcing that the web experience was available for everyone at threads.net. “Let us know what you think,” he said. While in the US, Threads’ website use jumped up by a fifth over the past week compared to the week prior, how this traffic may have contributed to the onboarding of new users remains unclear. Globally, the traffic increase to the platform via the website during this period was also only 3 per cent, according to digital intelligence firm Similarweb. In terms of other parameters as well, Threads’ traffic appears worrying. Mobile intelligence firm Sensor Tower reported earlier this month that daily active users on Threads dropped over 80 per cent since the platform’s launch, with only 8 million users using the app daily. There isn’t much data to also suggest there’s a rapid influx of new users signing up to join Threads since its web app launch. Similarweb speculates that much of the new Threads website visitors in the US were likely just older users moving from the app to the web. The Meta-owned app is continuing to test and roll out new features to woo in more users. The company is also starting to test keyword search in Australia and New Zealand. Mr Mosseri said the tests began on Thursday, and would expand to countries including the US “soon”. “Get excited – search is coming to Threads,” Meta boss Mark Zuckerberg posted on Threads along with a GIF of Vin Diesel from the Fast and Furious franchise saying, “I bet you gonna enjoy this.” Read More Threads launches on the web for everyone – apart from Europeans Musk admits X may be doomed to fail as new glitch wipes out pictures from former Twitter platform Twitter/X indicates it will start collecting ‘biometric information’ and ‘employment history’ Threads launches on the web for everyone – apart from Europeans Meta could finally launch Threads feature everyone is waiting for Elon Musk became ‘anti-woke’ because of his daughter’s gender transition, book claims

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