List of All Articles with Tag 'p'

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

Gio Reyna is on Gregg Berhalter’s U.S. roster for the first time since a family feud caused the men's national team coach to lose his job for the first five months of this year

Prosecutors say the ex-campaign treasurer for U.S. Rep. George Santos is scheduled to enter a guilty plea to an unspecified felony in connection with the federal investigation of financial irregularities surrounding the indicted New York Republican

No. 15 Oregon State heads into this week's trip to California knowing it can ill afford any more slipups if the Beavers want to contend for the Pac-12 title after losing two weeks ago to Washington State

Previewing Real Madrid's La Liga clash with 2023 Copa del Rey finalists Osasuna. Includes how to watch on TV, live stream, predicted lineups and score prediction.

SAN FRANCISCO--(BUSINESS WIRE)--Oct 5, 2023--

Aston Villa return to Europa Conference League action as they try to get their qualification hopes back on track against Bosnian champions Zrinjski Mostar. Playing European football for the first time in 13 years and having successfully negotiated Hibernian in the play-off round, Villa’s group stage started in disappointing fashion as they twice came from behind to equalise through Jhon Duran and Lucas Digne away to Legia Warsaw but eventually went down 3-2 in the Polish capital. That means victory over eight-time Bosnian title winners Zrinjski, who have climbed back to the top of the domestic game since Krunoslav Rendulic took over as manager last November, is a must and Unai Emery’s men are in good form since that defeat in Warsaw. They have beaten Chelsea and Brighton in the Premier League – the latter in a shock 6-1 thumping at the weekend – and will be heavy favourites to triumph on home turf, although Zrinjski are currently top of Group E after stunningly coming from 3-0 down at half-time to beat AZ Alkmaar 4-3 in their Europa Conference League opener. Here’s everything you need to know ahead of the fixture; see all the latest Europa League odds and tips for tonight here. When is Aston Villa vs Zrinjski Mostar? The match kicks off at 8pm BST on Thursday 5 October at Villa Park in Aston, Birmingham. How can I watch it? Viewers in the United Kingdom can watch the match live on TNT Sports 2, with coverage on the channel from 7:45pm BST. Subscribers can stream the action via discovery+, which is also available via Amazon Prime. If you’re travelling abroad and want to watch major sporting events then you might need a VPN to unblock your streaming app. Our VPN roundup is here to help: get great deals on the best VPNs in the market. Viewers using a VPN need to make sure that they comply with any local regulations where they are and also with the terms of their service provider. What is the team news? Villa were hit by the news that Boubacar Kamara, Moussa Diaby and Jacob Ramsey would all miss the match earlier this week, while Alex Moreno is out until after the international break and both Tyrone Mings and Emi Buendia are long-term absentees. Leon Bailey should be back in contention after a thigh strain, however. Krunoslav Rendulic normally favours a 4-3-3 formation with Tomislav Kis and Nemanja Bilbija in contention to lead the line and Zvonimir Kozulj pushing for a start after scoring twice in Zrinjski’s remarkable comeback against AZ last month. Predicted line-ups Aston Villa: Olsen; Cash, Konsa, Lenglet, Digne; Luiz, Tielemans; Traore, McGinn, Zaniolo; Duran Zrinjski Mostar: Maric; Corluka, Jakovljevic, Radic, Memija; Ivancic, Balic, Kozulj; Cuze, Kis, Ticinovic Odds Aston Villa win 1/10 Draw 10/1 Zrinjski Mostar win 30/1 Get the latest football odds here Prediction Villa to build on their impressive Premier League form and get their qualification hopes back on track. Aston Villa 4-1 Zrinjski Mostar Read More Unai Emery urges Aston Villa to adapt quickly to demands of European football Ollie Watkins scores hat-trick as rampant Aston Villa hit Brighton for six Unai Emery savours ‘special’ Villa Park atmosphere in rout of Brighton England boss Gareth Southgate hoping for positive news over Bukayo Saka fitness Arsenal renew Pedro Neto interest but face competition from two Premier League rivals Consistency the key for Vincent Kompany as he bids to lift Burnley

Arsenal spent 248 days at the top of the Premier League last season and still ended up empty-handed

The man who set off a smoke bomb and opened fire on a crowded New York City subway train last year, shooting 10 people, is expected to learn his sentence Thursday.

The military says "terrorist" drones targeted a graduation ceremony attended by cadets' families.

NEEDHAM, Mass.--(BUSINESS WIRE)--Oct 5, 2023--

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.