List of All Articles with Tag 'ac'

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

Two men are set to be charged with murder after a stray bullet from a gunfight in western Massachusetts struck a pregnant woman and killed her baby, the Hampden district attorney's office said Thursday.

After getting benched in Week 4, Mac Jones needs to show the New England Patriots he is still capable of being the team's long-term option at QB.

The new border force is designed to curb rising illegal immigration - a major political issue.

By Olena Harmash KYIV (Reuters) -A Russian missile slammed into a cafe and grocery store in a village in northeastern

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

Here are the latest MLB rumors regarding the chaotic Toronto Blue Jays, the perpetual mess that are the New York Mets and the latest on Max Fried's health ahead of the Atlanta Braves' NLDS matchup with the division rival Philadelphia Phillies.

Each MLB Wild Card series needed just two games. Here's how things stand after the first round.

The makers of the latest in the stealth action series have put Arabic front and centre of the project.

Amazon.com Inc. and Microsoft Corp.’s cloud services face an investigation by the UK’s antitrust watchdog over concerns the

Sri Lanka cut its benchmark rate for a third time this year to help revive economic growth and