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Massive eruption on dead star pushes particles to cosmic speed limit

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A burned-out stellar core produced a shockwave that pushed particles to their theoretical speed limit, scientists have reported. Astronomers used a gamma-ray observatory in Namibia called the High Energy Stereoscopic System (HESS) to show how an eruption creates a shock wave that accelerates material around it super-fast speeds. The research focused on RS Ophiuchi, a … Read more

‘Ghost particle’ coming into focus: Scientists put upper limit on mass of neutrinos

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Every second, about 100 trillion neutrinos pass through your body. These ghostly particles are fundamental to our understanding of the universe. But they’re extremely small — so small that scientists once thought they had no mass at all.  Neutrinos do indeed have mass, however, and physicists have now managed to put a new upper limit … Read more

Physicists Just Achieved a New Smallest Measurement of a Ghost Particle’s Mass

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Decaying isotopes of hydrogen have just given us the smallest measurement yet of the mass of a neutrino. By measuring the energy distribution of electrons released during the beta decay of tritium, physicists have determined that the upper limit for the mass of the electron antineutrino is just 0.8 electronvolts. That’s 1.6 × 10–36 kilograms … Read more

We Have Breached The Safe Planetary Limit For Synthetic Chemicals, Scientists Warn

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From sea to land to sky, Earth’s systems are contaminated with synthetic substances, and scientists warn it has already pushed the integrity of our planet over the brink. Today, there are about 350,000 human-made chemicals on the market, including plastics, pesticides, industrial chemicals, cosmetic chemicals, antibiotics, and other drugs.   The fact this number continues … Read more

Omicron: England must act before Christmas to limit hospitalisations and deaths

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By Michael Le Page and Graham Lawton People queue for vaccinations at St Thomas’ Hospital in London Dan Kitwood/Getty Images The world is facing a surge in hospitalisations and deaths from the omicron variant of the coronavirus that could be as bad as in previous waves, even if omicron is only a third as severe … Read more