Astronomers identify 2% threshold for delayed black hole jets — ScienceDaily - UA.NEWS
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Astronomers have found that supermassive black holes can launch delayed jets of matter when their rate of matter accretion falls to about 2% of the Eddington limit. The same relative threshold was previously associated with jet formation in much smaller black holes in the Milky Way, ScienceDaily reports. The study’s results were published in Nature Astronomy. The work was led by astrophysicist Adele Goodwin of the Curtin University node of the International Centre for Radio Astronomy Research, together with Andrew Mummery of the Institute for Advanced Study in Princeton. The scientists studied why, after a star is destroyed by a supermassive black hole, a radio jet sometimes appears almost immediately and sometimes only months or years later. Data on stellar disruptionsThe researchers analyzed 20 tidal disruption events — phenomena in which a star passes too close to a supermassive black hole and is torn apart by its gravity. Part of the stellar debris falls into the black hole, temporarily increasing its feeding rate. More current news is available on the UA. News Telegram channel Telegram.
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Bowel and ovarian cancer rising among people under 50 in England — ScienceDaily - UA.NEWS
In England, the incidence of bowel and ovarian cancer has increased statistically significantly among people under 50, while no such increase was recorded in the group aged 50 and over. This was shown by a study published in BMJ Oncology, ScienceDaily reports. Scientists analyzed records from England’s National Disease Registration Service for 2001–2019. They compared trends in more than 20 types of cancer among men and women aged 20 to 49 and among people aged 50 and over. Increase in several types of cancerAmong younger women, a statistically significant increase was identified for 16 of the 22 studied cancer types, and among younger men, for 11 of 21. People under 50 more often developed thyroid, liver, kidney, gallbladder, bowel, pancreatic, oral, breast and ovarian cancers, as well as multiple myeloma and endometrial cancer. Among younger women, the incidence of endometrial, kidney, pancreatic and thyroid cancers, as well as multiple myeloma, rose faster than in the older group. Among men, this trend was found only for multiple myeloma. More current news is available on the UA. News Telegram channel Telegram.

Ancient mud reveals a surprising secret about Greenland’s ice - Earth.com
Mud from a fjord shows an Atlantic air pattern brought wetter, colder spells to southern Greenland, a clue to how its ice may fare. Greenland’s ice is shrinking as the planet warms. But in the island’s southwest, rainfall and snowfall have been influenced by the same North Atlantic air-pressure pattern for at least 5,000 years. When that pattern tipped one way, the region turned wetter and colder. The record comes from mud on the floor of a Greenland fjord, and it suggests snowfall, not only temperature, shaped how the area’s ice grew and shrank. It doesn’t yet show how glaciers there will respond to the warming ahead. Johan Faust, a researcher at MARUM, the Center for Marine Environmental Sciences at the University of Bremen in Germany, led the work with colleagues in Germany, Norway, Denmark and Canada. A seesaw in the airThe pattern is called the North Atlantic Oscillation. It’s the difference in air pressure between a low that sits near Iceland and a high near the Azores, and it’s strongest in winter. When that difference is large, the pattern is in its positive phase. Northwestern Europe and southwestern Greenland both get more rain and snow.
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