List of All Articles with Tag 'ace'

By Daniel Wiessner Elon Musk's SpaceX has been sued by a female former employee who claims the rocket

The group that successfully challenged race-conscious college admissions policies at the U.S. Supreme Court sued the U.S. Naval

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

Senior Biden administration officials privately believe only weeks remain before a lack of additional Ukraine funding starts to become a serious battlefield concern -- a scenario they are trying to avoid with public warnings and a major speech from President Joe Biden himself.

The Anti-Defamation League on Wednesday said it plans to resume advertising on X, the platform formerly known as Twitter, following a spat with owner Elon Musk.

Profiling Crystal Palace icon and former Manchester United forward Wilfried Zaha - a prodigous talent whose route to playing Champions League football was long, winding but always within touching distance.

MILAN Italian luxury group Prada and Texas-based startup Axiom Space will collaborate to design NASA's lunar spacesuits for

Nepal has spent millions constructing a new airport in hopes of boosting tourism - but no-one is coming.

Killings by militant Islamists have intensified since the military seized power in July.

By Lucy Craymer WELLINGTON Race and relations with the indigenous Maori population have emerged as issues in New

The owner of the fast-food brand says there are "no new updates" on its pledge to leave Russia.

Along with a set of horror flick villains, movie psycho Ghostface could be set to be added as a paid playable character in ‘Mortal Kombat 1’.