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The universe appears to be speaking to us, after a centuries old “echo” from a supermassive black hole was detected by scientists. The black hole located inside the Milky Way became active around 200 years ago and produced a sound that is now being studied. The research was published in Nature and focuses on the black hole named Sagittarius A* (Sgr A*) found 26,000 light-years away from Earth. The noise was triggered when the object consumed gas and dust, with particles moving into the event horizon. The findings could teach us more about the activity of supermassive black holes, which continue to intrigue and confound scientists. Sign up to our free Indy100 weekly newsletter Author of the research Dr Frederic Marin of Strasbourg University said: “It reveals the past awakening of this gigantic object – which is four million times more massive than the Sun. “Our work presents the missing piece of evidence that X-rays from the giant molecular clouds are due to reflection of an intense, yet short-lived flare produced at or nearby Sagittarius A*. These results can further constrain the past activity of the galactic centre.” By their very nature, black holes are difficult to study as they absorb light around them, and these new findings offer insight into a fascinating part of space. Dr Marin said: “To get an idea of the increase in intensity of the X-ray emission when the black hole emerged from its quiescent state, it is as if a single glow-worm hidden in a forest suddenly became as bright as the Sun. “These findings explain why galactic molecular clouds near Sgr A* are shining more brightly than usual. It is because they are reflecting the X-rays emitted by Sgr A* 200 years ago.” Have your say in our news democracy. Click the upvote icon at the top of the page to help raise this article through the indy100 rankings.

History buffs on Facebook were left convinced of time travel after a black and white photograph originating from World War II appeared to show a man speaking on a mobile phone. In the image, the conspicuous figure could be seen leaning against a shop front on a crowded pavement amongst locals as well as US army soldiers deployed there. According to The Sun, the image was taken in Iceland’s capital of Reykjavík in 1943 – long before the invention of the portable telephone devices. The first mobile phone, the Motorola DynaTAC 8000X, was sold in 1973. The man who appeared to be holding a device to his ear was dressed in a light-coloured coat, wore a flat cap and was looking in the direction of the camera that captured the image. The picture which has sparked conspiracy theories of time travel was shared by its owner Kristján Hoffman on the Facebook group Gamlar ljósmyndir, which translates to “Old Photographs”. Hoffman wrote on Facebook: “The American army is taking over Icelandic splendour, as you can see. “One thing that draws attention to this beautiful picture is that above the window, in the corner in the middle of the picture, a man is leaning and is on a cell phone.” The post sparked a lot of debate online as people gave their different theories. One person suggested the man was simply scratching his ear, while another said he was holding his watch up to see if it was working since the man is standing outside a watch shop in the image. But Hoffman stuck to his own beliefs, saying: “He's in a stupor, standing alone and wearing a different headdress than the others and a scarf and acting like we would do today. “He has an overview of the square and nothing like having a conversation with someone on a smartphone.” Another person in the comments joked that Icelanders had “already invented the mobile phone way before anyone else!” Sign up to our new free Indy100 weekly newsletter Have your say in our news democracy. Click the upvote icon at the top of the page to help raise this article through the indy100 rankings.