A court in Moscow on Wednesday handed a former state TV journalist a 8 1/2-year prison term in absentia for protesting Russia's war in Ukraine, the latest in a months-long crackdown against dissent that has intensified since Moscow's invasion 20 months ago. Marina Ovsyannikova was charged with spreading false information about the Russian army, a criminal offense under a law adopted shortly after the Kremlin sent troops to Ukraine. She held a picket in the Russian capital in July 2022, and held a poster that said “(Russian President Vladimir) Putin is a killer. His soldiers are fascists. 352 children have been killed (in Ukraine). How many more children need to die for you to stop?” Ovsyannikova, who until March 2022 worked at for Russia's state-run Channel One, was detained and placed under house arrest, but managed to escape to France with her daughter. Russian authorities put her on a wanted list and prosecuted and tried her in absentia. In March, 2022 Ovsyannikova made international headlines after appearing behind the anchor of an evening Channel One news broadcast with a poster that said “Stop the war, don’t believe the propaganda, they are lying to you here.” She quit her job at the channel, was charged with disparaging the Russian military and fined 30,000 rubles ($270 at the time). Thousands of Russians have been fined and hundreds have faced criminal charges over publicly speaking out or protesting against the war in the last 20 months. The Kremlin has used legislation outlawing criticism of what it insists on calling a “special military operation” to target opposition figures, human rights activists and independent media. Top Kremlin critics have been handed lengthy prison terms, rights groups have been forced to shut down, independent news sites were blocked and independent journalists have left the country, fearing prosecution. Read More Ukraine war’s heaviest fight rages in east - follow live Charity boss speaks out over ‘traumatic’ encounter with royal aide

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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

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