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2025-05-24 13:03:59
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  濮阳东方看妇科专不专业   

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

  濮阳东方看妇科专不专业   

After dozens of puppies were found in rural Pottawattamie County, Iowa with no food and water before being rescued Sunday, authorities ramped up their investigation into Young Gunz Kennel.They obtained a search warrant and confiscated items for several hours Tuesday.Sheriff deputies and animal control personnel hauled away a large number of kennels that were at the unlicensed facility, which was used for obedience and hunting training, as well as dog breeding. Investigators could also be seen snapping photos and collecting additional evidence that they could find at the site, which housed as many as 50 dogs before many of them were found inside their kennels severely malnourished. A total of four dogs have now been found dead, and 10 are missing.Copper was one of the dogs that was rescued on Sunday. When his owner Wil Beach picked him up, Copper had lost 20 pounds and was covered in feces. "He was very scared but still in high spirits, he was the same dog emotionally when I got him (back) than when I dropped him off,” says Beach.Beach says he took Copper and a 0 check to owner Dustin Young in January after high praises from friends. He says he did not suspect anything amiss when he made the drop-off. "When I was there it was neat and clean and organized and he was very talkative and he just seemed like he had a passion for dogs," says Beach.Beach is thankful that his two-year old pup is okay, with no major issues from the abandonment.  1500

  濮阳东方看妇科专不专业   

ALPINE, Calif. (KGTV) - An Alpine woman who tested positive for COVID-19 says her quarantine turned into a nightmare as a postal carrier delivered a package.This past weekend, Tamica got a COVID test after three co-workers tested positive. She also tested positive and remains asymptomatic."Since I got that Sunday, I've been quarantining at home," said Tamica.On Tuesday, past 1 p.m., as the mail truck pulled up to her apartment off Tavern Road, her two 80-lb. dogs ran to the front door and started barking. She says the door was open but the screen door was shut, as the postal carrier stood outside, at the door, with something in his hand."They were instantly pawing at their face and backed up, and acting weird ... jumping up and down and making a whining noise," said Tamica.Tamica believes the postal carrier had used his pepper spray. At that point, Tamica says the dogs jumped on the door and pushed it open. They ran out, and she ran after them. Tamica says the letter carrier sprayed toward one dog as it ran off, before turning to her other dog."I just jumped in front of my dog. He's wasn't doing anything. He wasn't barking. He was just sitting there .... He's a golden retriever and very friendly ... The postal carrier is spraying us, yelling and just spraying wildly," Tamica said.Tamica says that went on for about a minute, and it seemed liked forever."I was mad, scared, ready to cry … yelling at him to stop, stop, stop!" said Tamica.She says he finally did. Her dogs' eyes were left shut and stinging for hours. Her eyes were also ripe with pain. Tamica filed a complaint with the Postal Service."It's outrageous. This was not warranted at all," said Tamica.A different version of events has emerged from the postal carrier's statements.According to a USPS spokesperson, he claims he never sprayed through the screen door, didn't intend to pepper-spray Tamica, and only started spraying when both dogs were outside, lunging at him, to allow him to "leave the area."The spokesperson adds that based on the statements collected, they are standing by their postal carrier's version of events. They did apologize for Tamica getting pepper-sprayed in the incident.They also issued the following statement:"The Postal Service places the safety of its employees as a top priority. Letter carriers fearing for their safety due to a loose or unrestrained pet may stop delivery and ask homeowners to pick up their mail at the Post Office until the pet is restrained. In cases where a carrier sees a dog roaming and can’t discern where it resides, delivery could be interrupted to the entire neighborhood.In 2019, San Diego ranked #10 in the country for dog attacks on letter carriers. Dogs can be protective of their territory and may interpret the actions of letter carriers as a threat. Please take precautions when accepting mail in the presence of your pet. When a carrier comes to your home, keep your dog inside, away from the door in another room. Any dog can bite. Even the friendliest dog may bite when startled or surprised. If the dog is physically or mentally unhealthy, is in pain, feels threatened, or is protecting its food or a favorite toy, it can bite.The letter carriers at your local Post Office deliver every day. And if you are a dog owner, we need you to deliver for us, too. Keep your dog on a leash or away from the door, so that your letter carrier can safely deliver to your mailbox or porch, today and every day." 3464

  

Airbus H125 helicopters are commonly used in LCMCD’s daily operations, allowing inspectors to land in mangrove marshes where salt marsh mosquitoes are common. pic.twitter.com/IwPg5gGkTd— Lee County Mosquito Control (@LeeCoMosquito) May 12, 2020 252

  

According to multiple media reports, an anonymous person paid off nearly ,000 worth of layaway items at a Walmart in Bristol, Tennessee.According to WJHL, a Good Samaritan donated ,995 on Monday, which was enough to cover the store's entire balance of the layaway items.WCBY reported that the person made the payment "in Christ's name."Walmart told WVLT that the donor "wanted to affect as many people as possible positively." 440

来源:资阳报

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