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发布时间: 2025-05-25 00:28:44北京青年报社官方账号
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  成都中医治血管瘤   

MONROE, Ohio -- One of four Monroe, Ohio High School students injured Friday night on the way to prom has died, the district confirmed Monday."We ask that you continue to keep the families impacted by this tragic accident in your thoughts and prayers," Monroe Local Schools Superintendent Phil Cagwin said. "We will continue to do all we can to support our students through this difficult time." 403

  成都中医治血管瘤   

NASA's OSIRIS-REx mission and the asteroid Bennu have had a date planned for two years, and just after noon ET today, they finally got to meet face to face. OSIRIS-REx fired its thrusters for a small burn, putting it about 4.3 miles from Bennu, marking the end of its journey to the asteroid.The mission -- which stands for Origins, Spectral Interpretation, Resource Identification, Security-Regolith Explorer -- is NASA's first asteroid sample return mission. It launched in September 2016 and will spend two years up close and personal with Bennu. First images of the asteroid from the spacecraft's perspective have appeared as it got closer and closer.On Tuesday, the spacecraft will fly within 5 miles of Bennu, which will help design future orbits and map the surface.Over the next year, OSIRIS-REx will survey the asteroid using five scientific instruments on board the spacecraft. These instruments will help it determine a safe location from which to collect a small sample from Bennu's surface that will be returned to Earth in September 2023."Bennu's low gravity provides a unique challenge for the mission," said Rich Burns, OSIRIS-REx project manager at NASA's Goddard Space Flight Center. "At roughly 0.3 mile in diameter, Bennu will be the smallest object that any spacecraft has ever orbited."The sample from Bennu, a near-Earth asteroid, could help scientists understand not only more about asteroids that could impact Earth but about how planets formed and life began.OSIRIS-REx has a camera suite, a laser altimeter for 3D mapping, a thermal emission spectrometer to take temperature and mineral content and spectrometers to measure X-rays, nearly infrared and visible light.An arm mechanism called TAGSAM will reach out to collect the sample from Bennu's surface, making contact with the asteroid for five seconds in July 2020. During this contact, the arm will use a nitrogen gas burst to stir up rock and other materials on the surface so it can capture them. There is enough nitrogen for three attempts if the first is unsuccessful.NASA said the estimated 2.1-ounce sample size equates to about 30 sugar packets worth of dirt and rocks.The arm has a full range of motion, with joints capable of movement comparable to shoulder, elbow and wrist joints. It was "flexed" in space for the first time on November 14."The TAGSAM exercise is an important milestone, as the prime objective of the OSIRIS-REx mission is to return a sample of Bennu to Earth," said Dante Lauretta, OSIRIS-REx principal investigator at the University of Arizona, Tucson. "This successful test shows that, when the time comes, TAGSAM is ready to reach out and tag the asteroid."In 2021, it will be time for the spacecraft to essentially turn around and begin its two-year journey home. The sample will be packed into a capsule that will drop in the Utah desert in 2023.For two years after the return, the sample will be cataloged and analyzed. Afterward, 75% of the returned sample will remain at NASA's Johnson Space Flight Center so it can be used for more research by scientists from around the world.Why did NASA select Bennu out of the 780,000 known asteroids in our solar system?It was discovered in 1999, and scientists have been studying it ever since. The asteroid fits a number of criteria that make it intriguing and convenient.Bennu is relatively close to Earth, and its orbit even crosses that of our planet, making a close approach every six years. Though small asteroids can rotate very quickly, Bennu has a diameter just a bit bigger than the height of the Empire State Building and rotates relatively slowly, each 4.3 hours. This means OSIRIS-REx can match its velocity and touch down briefly.The asteroid could pass close to Earth, closer than the moon, in 2135, with even closer approaches possible in 2175 and 2195. A direct hit is unlikely, but the data gathered during this mission can help determine the best ways to deflect near-Earth asteroids.The asteroid is also old and well-preserved, full of valuable materials that may even contain clues about how life began. Bennu is essentially a leftover from the formation of our solar system billions of years ago, although some of the minerals inside it could be even older.This carbon-rich asteroid could be full of organic molecules, metals, platinum and even water -- the essential ingredients for life. It's because of objects like Bennu that these resources were delivered to Earth during its formation.Asteroids could even serve as fuel stations for robotic and human missions if we can unlock the hydrogen and oxygen inside them, NASA said.Bennu probably broke off of a larger asteroid in the asteroid belt between Mars and Jupiter a couple billion years ago. This knocked it through space until an orbit close to Earth locked it in place. And Bennu is believed to be a grouping of rocks held together by gravity rather than a single object.But its orbit drifts 0.18 miles each year toward the sun, and OSIRIS-REx will enable researchers to understand why and to predict Bennu's movements. This could also explain how it ended up as a near-Earth asteroid."The story of this asteroid is the story of the solar system," said Bashar Rizk, instrument scientist for OSIRIS-REx. "When we understand Bennu, we will understand something fundamental about our solar system."The-CNN-Wire 5356

  成都中医治血管瘤   

MISSION VIEJO, Calif. (AP) — Two people were bitten by a coyote in two separate attacks on a Southern California trail on Saturday. A spokeswoman for the city of Mission Viejo in Orange County says a woman was jogging on the Jeronimo Open Space when a coyote bit her lower left calf, leaving four puncture wounds. A second person said they were bitten on the left ankle while they were on the trail around 6:30 a.m. Both went to the hospital for treatment. The city shut the trail pending an investigation by animal control officers and California Department of Fish and Wildlife.RELATED COVERAGE:Video: Coyote attacks pit bull at Chula Vista parkTrapping plan underway for aggressive coyotes near Chula Vista park, baseball fieldColumbus Zoo visitors spot missing red panda that hadn't been seen for two daysIt's not a Disney film: Coyote, badger travel under California highway together 896

  

MYSTERY SOLVED! ??We FINALLY (almost certainly...) know where Stonehenge's giant sarsen stones come from!THREAD ?? pic.twitter.com/Lnkb2vB32R— English Heritage (@EnglishHeritage) July 29, 2020 200

  

Months of debate have transitioned into action as school districts across the country welcome students back for the 2020-2021 school year, whether online or in-person.In Iowa, however, the debate over how to approach the topic has transitioned to the court system.In July, Gov. Kim Reynolds announced a new mandate at a press conference requiring school districts teach at least 50 percent of its curriculum in-person. She also said school districts would only be able to move to an online-only curriculum if the COVID-19 positivity rate in that region reached 15 percent or higher.It is one of the highest positivity rate thresholds in the country.The CDC has used the positivity rate, or percentage of COVID-19 tests that return a positive result, as a barometer of how the coronavirus is circulating across the country. Below 10 percent is indicative of the shrinking rate of transmission.When it came out with school guidelines, the CDC recommended schools only reopen to in-person learning if the positivity rate was 5 percent or below.For comparison, New York City has said kids can’t go back to school until the positivity rate is under 3 percent. Arizona has set its bar at 7 percent, and even the surgeon general has said schools nationwide shouldn’t consider returning to in-person learning unless the positivity rate is under 10 percent.“I look at my husband who has to go teach in high school and look at the risks that presents to him. I have to look at my kids who are missing out on in-person school,” said Lisa Williams, a school board member in Iowa City.Recently, the Iowa City Community School District joined in on a lawsuit filed against the state that claims the governor is violating the state constitution by not looking out for the well-being of Iowans.“It’s troubling,” said Williams. “I think kids need to be in school. They need to be for a whole host of reasons, but I don’t think the 15 percent is a good barometer of whether or not it is safe to do so.”“I was shocked,” said Mary Kenyon of the governor’s mandate. “I was angry. I’m still angry. I have a lot of anger.”Kenyon has decided to keep her son home to learn online unless things change. Despite the new mandate, the state is allowing parents to keep their kids home so they can learn in a virtual-only capacity if they choose.“They are trying to create a policy that will blanket a state that has widely varying types of educational settings,” she said.The issue isn’t exclusive to Iowa, either, but most rural states. Iowa City’s school district has 14,000 students. Compare that to some of its rural counties that only have a few hundred and a 15 percent positivity rate means something entirely different, she says.“I think we all want what’s best for our kids and we all don’t agree on what that looks like,” said Williams. 2825

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