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发布时间: 2025-05-31 09:20:38北京青年报社官方账号
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A week after a 13-year-old girl vanished, a local sheriff is seeking a cadre of volunteers that's equivalent to two-thirds of the population of the small Wisconsin city near the teenager's home.Barron County Sheriff Chris Fitzgerald on Monday asked for 2,000 volunteers to help authorities in an expanded routine search of the area around the crime scene Tuesday for possible evidence in the investigation into Jayme Closs' disappearance. The teenager vanished early October 15 and her parents were found fatally shot in their home near the city of Barron in northwestern Wisconsin. Barron, a city of less 3 square miles, has a population of about 3,300, according to US Census figures.Monday's call for volunteers is 10 times the number of volunteers the sheriff sought last week. Fitzgerald said more people are needed to help search a bigger area. 883

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After almost two years circling an ancient asteroid hundreds of millions of miles away, a NASA spacecraft this week will attempt to descend to the treacherous, boulder-packed surface and snatch a handful of rubble.The drama unfolds Tuesday as the U.S. takes its first crack at collecting asteroid samples for return to Earth, a feat accomplished so far only by Japan.Brimming with names inspired by Egyptian mythology, the Osiris-Rex mission is looking to bring back at least 2 ounces (60 grams) worth of asteroid Bennu, the biggest otherworldly haul from beyond the moon.The van-sized spacecraft is aiming for the relatively flat middle of a tennis court-sized crater named Nightingale — a spot comparable to a few parking places here on Earth. Boulders as big as buildings loom over the targeted touchdown zone.“So for some perspective, the next time you park your car in front of your house or in front of a coffee shop and walk inside, think about the challenge of navigating Osiris-Rex into one of these spots from 200 million miles away,” said NASA’s deputy project manager Mike Moreau.Once it drops out of its half-mile-high (0.75 kilometer-high) orbit around Bennu, the spacecraft will take a deliberate four hours to make it all the way down, to just above the surface.Then the action cranks up when Osiris-Rex’s 11-foot (3.4-meter) arm reaches out and touches Bennu. Contact should last five to 10 seconds, just long enough to shoot out pressurized nitrogen gas and suck up the churned dirt and gravel. Programmed in advance, the spacecraft will operate autonomously during the unprecedented touch-and-go maneuver. With an 18-minute lag in radio communication each way, ground controllers for spacecraft builder Lockheed Martin near Denver can’t intervene.If the first attempt doesn’t work, Osiris-Rex can try again. Any collected samples won’t reach Earth until 2023.While NASA has brought back comet dust and solar wind particles, it’s never attempted to sample one of the nearly 1 million known asteroids lurking in our solar system until now. Japan, meanwhile, expects to get samples from asteroid Ryugu in December — in the milligrams at most — 10 years after bringing back specks from asteroid Itokawa.Bennu is an asteroid picker’s paradise.The big, black, roundish, carbon-rich space rock — taller than New York’s Empire State Building — was around when our solar system was forming 4.5 billion years ago. Scientists consider it a time capsule full of pristine building blocks that could help explain how life formed on Earth and possibly elsewhere.“This is all about understanding our origins,” said the mission’s principal scientist, Dante Lauretta of the University of Arizona.There also are selfish reasons for getting to know Bennu better.The solar-orbiting asteroid, which swings by Earth every six years, could take aim at us late in the next century. NASA puts the odds of an impact at 1-in-2,700. The more scientists know about potentially menacing asteroids like Bennu, the safer Earth will be.When Osiris-Rex blasted off in 2016 on the more than 0 million mission, scientists envisioned sandy stretches at Bennu. So the spacecraft was designed to ingest small pebbles less than an inch (2 centimeters) across.Scientists were stunned to find massive rocks and chunky gravel all over the place when the spacecraft arrived in 2018. And pebbles were occasionally seen shooting off the asteroid, falling back and sometimes ricocheting off again in a cosmic game of ping-pong.With so much rough terrain, engineers scrambled to aim for a tighter spot than originally anticipated. Nightingale Crater, the prime target, appears to have the biggest abundance of fine grains, but boulders still abound, including one dubbed Mount Doom.Then COVID-19 struck.The team fell behind and bumped the second and final touch-and-go dress rehearsal for the spacecraft to August. That pushed the sample grab to October.“Returning a sample is hard,” said NASA’s science mission chief, Thomas Zurbuchen. “The COVID made it even harder.”Osiris-Rex has three bottles of nitrogen gas, which means it can touch down three times — no more.The spacecraft automatically will back away if it encounters unexpected hazards like big rocks that could cause it to tip over. And there’s a chance it will touch down safely, but fail to collect enough rubble.In either case, the spacecraft would return to orbit around Bennu and try again in January at another location.With the first try finally here, Lauretta is worried, nervous, excited “and confident we have done everything possible to ensure a safe sampling.”___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely responsible for all content. 4807

  宜宾q8祛斑   

ALPINE, Calif. (KGTV) -- The woman authorities say was shot and killed in an Alpine neighborhood Saturday has been identified. According to the San Diego County Sheriff’s Department, Melanie Benitez, 27, was shot on the 2800 block of North Victoria Drive around 2 p.m. The department also identified the suspect in the case as Paul Paraschak, 42. Deputies say Benitez and Paraschak were dating and lived together in Alpine. An area resident heard a scream and called 911 around 2 p.m. Saturday. RELATED: Woman shot and killed in quiet Alpine neighborhoodBenitez’s body was found in the passenger seat of a car in front of a neighbor’s driveway. Deputies detained Paraschak on foot about a half mile away with two hand guns, said Lt. Rich Williams, San Diego County Sheriff's Homicide Unit.Paraschak was arrested for one count of murder and booked into the San Diego Central Jail, where he is being held without bail. 924

  

After no one won Friday's giant Mega Millions lottery, the jackpot for Tuesday's drawing has climbed to an estimated .6 billion, marking an all-time record for lottery drawings in the US. In case you want to confirm that you did not win during Friday's billion drawing.The winning numbers on Friday were 65-53-23-15-70 and the Mega Ball was 7.Only one other jackpot in U.S. history has surpassed the billion mark. That jackpot was via the Powerball lottery on Jan. 13, 2016, and that drawing was worth .586 billion. In that instance, three winners split the massive jackpot. The Mega Millions jackpot has been building since July 27 when a winning ticket was sold in California. Mega Millions is played in all states except Hawaii, Alaska, Nevada, Utah, Mississippi and Alabama. The odds of drawing all six numbers in Mega Millions are 1 in nearly 302 million. Although no one matched every single number, you could still be a winner. Selecting the Mega Ball is worth . If you get all five white numbers correct without hitting the Mega Ball, a ticket is worth million. Mega Millions is not the only lottery out there that is large.. Powerball's jackpot on Saturday is a slightly more modest 0 million.Take a look at the list below for the largest jackpots in U.S. history, according to the Arizona Lottery: 1363

  

About 26,000 Ford vehicles are being recalled with three different safety concerns announced this week.The first one is for certain 2016-2020 Lincoln MKX and Nautilus vehicles with 16-way power seats. The issue is with the wiring of the seat harness and how close they are to the seat cushion pan. If certain wires are damaged from coming into contact with the seat cushion frame, Ford says the airbag system may not perform as intended.People with impacted models can go to a dealer to have them install flocking tape and check the wires.The second recall is for the newest model of F-650 and F-750 trucks. The vehicles are missing certain thermal protection components intended to reduce the interior cabin floor and seat attachment temperatures in hot conditions.The third recall affects less than 100 of the 2020 Ford Escape and Transit vehicles. The airbag may not inflate properly. People are encouraged to take their vehicle to a Ford dealer to have the airbag checked.Ford is not aware of any injuries from any of these safety concerns. 1052

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