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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.

Lawrence Livermore National Laboratory researcher Isaiah Santistevan led the development of three-dimensional simulations exploring how a nuclear device could deflect or disrupt an asteroid threatening Earth. Credit: Blaise Douros/LLNL Lawrence Livermore National Laboratory (LLNL) researchers are developing three-dimensional simulations to examine how a nuclear device could be used to deflect or potentially disrupt an asteroid threatening Earth.

Orcas are hunting great White Sharks around the world, scientists confirmThe killing of great whites by orcas has been reported in the waters of South Africa, California, and Australia, and the implications that the hunting behaviour would have on the marine ecosystem have been considered. In fact, it all started back on May 3, 2017, when the body of a female great white, weighing 1,100 kilograms, washed ashore in Gansbaai, close to Cape Town, with a deep gash through which its 90-kilogram liver had been extracted. Five more corpses of great whites appeared with similar wounds in the coming months, as claimed by shark biologist Alison Towner of Rhodes University. Two adult males, called Port and Starboard, who are supposed to be brothers judging by their dorsal fins that fold differently, were identified as the most probable perpetrators. The connection was officially established in 2022 based on video footage of a drone that caught three orcas chasing and biting a 3-meter great white off Mossel Bay. The sharks quickly disappeared from Dyer Island, one of the best places in the world to witness a great white.