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山东省著名的癫痫病医院
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发布时间: 2025-05-25 03:22:39北京青年报社官方账号
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  山东省著名的癫痫病医院   

A Japanese space probe has successfully fired a "bullet" into an asteroid as part of a mission to collect rock samples from the celestial body.The projectile disturbed material from the exterior of asteroid Ryugu which then floated from its surface due to the weak gravitational field.These particles were successfully collected by the probe, according to Japan's space agency JAXA, which announced that the Hayabusa 2 craft had successfully touched down on on the asteroid on Friday morning Japanese time.JAXA scientists had expected to find a powdery surface on Ryugu, but tests showed that the asteroid is covered in larger gravel.As a result the team had to carry out a simulation to test whether the projectile would be capable of disturbing enough material to be collected by what scientists call a "sample horn," which protrudes from the underside of the probe.This video shows the success of a December 28 test, which green-lit the asteroid landing.The team is planning a total of three sampling events over the next few weeks.Hayabusa 2 will depart Ryugu in December 2019 and return to Earth by the end of 2020 with its precious cargo of samples, which will be analyzed by scientists such as John Bridges, a professor of planetary science at the University of Leicester, UK.Bridges, who was also involved in the first Hayabusa mission, told CNN via telephone on Thursday that the event was "nail-biting stuff" due to the extreme precision involved in landing on Ryugu."This is a significant mission," said Bridges. "Sample return missions are particularly exciting."He told CNN that the Hayabusa 2 mission is interesting because Ryugu is a C-class asteroid which humans haven't visited before."One thing I'm pretty sure of is that it will throw up some unexpected results," said Bridges, who believes that information from Ryugu samples could make us think again about the early evolution of the solar system.Beneath their desolate surface, asteroids are believed to contain a rich treasure trove of information about the formation of the solar system billions of years ago.C-type asteroids, which are largely composed of carbon, are the most common variety of asteroids, comprising more than 75% of those currently discovered. The other two main types of asteroid are the metallic S- and M-types, according to NASA.Ryugu is expected to be "rich in water and organic materials," allowing scientists to "clarify interactions between the building blocks of Earth and the evolution of its oceans and life, thereby developing solar system science," JAXA said.If Hayabusa 2 makes it back to Earth on schedule it will be the first mission to bring back samples from a C-class asteroid.JAXA scientists are currently racing NASA for that historic achievement, with the US agency's own sample retrieval mission due to arrive back on Earth in 2023.Even reaching the asteroid is a massive achievement as it is the equivalent of hitting a 6-centimeter (2.4-inch) target from 20,000 kilometers (12,400 miles) away."In other words, arriving at Ryugu is the same as aiming at a 6-centimeter target in Brazil from Japan," said JAXA.The-CNN-Wire? & ? 2019 Cable News Network, Inc., a Time Warner Company. All rights reserved. 3233

  山东省著名的癫痫病医院   

A key Senate committee passed a sweeping, bipartisan bill Wednesday, marking the chamber's first effort to address several major health care issues plaguing the nation.The Senate Health Committee voted 20-3 to advance the legislation, which seeks to tackle 269

  山东省著名的癫痫病医院   

A fire at a Pennsylvania day care center early Sunday killed five children, including four siblings, officials said.Four people were injured, including two teenagers who jumped from a second-floor window onto a porch of the home in Erie to escape the flames, Erie Fire Chief Guy Santone told CNN in an interview. Santone said the homeowner was injured, along with a neighbor who tried to enter the burning home to rescue victims.Eight people were in the home when the fire broke out around 1:15 a.m., Santone said. The home also operated as a day care, according to fire officials."I was just down there, there's flowers everywhere," Santone said about a memorial at the scene. "Nobody likes to see this, especially when it's kids."Firefighters rescued the five children from second-story bedrooms at the front of the home, 836

  

A four-day manhunt for the driver who mowed down a 9-year-old girl playing in her front yard is over.But the suspect's explanation for the hit-and-run is surprising.Gabriel Fordham turned himself in to Georgia authorities on Tuesday, the DeKalb County Sheriff's Office said.Officials say he plowed his car into LaDerihanna Holmes before crashing into her home and then fleeing the scene on Friday.Dontaye Carter, a spokesman for Fordham's legal team, said Fordham was fighting off a carjacker when the crash happened."He was carjacked when stopped at a stop sign when a guy jumped in his car and pistol-whipped him, and he tried to fight him off," Carter said.At a news conference Wednesday, the DeKalb County Police Department said it couldn't confirm whether the carjacking claim was true, since the investigation is ongoing.Fordham has been charged with failure to maintain lane, failure to stop at a stop sign, reckless driving, hit and run and serious injury by vehicle.LaDerihanna was outside playing with a friend when she caught just a glimpse of a dark car speeding toward her.Surveillance footage shows the car flying over the curb and onto the girl's front lawn in Lithonia, near Atlanta. LaDerihanna starts to sprint, but she can't outrun the careening car as it crashes into her and then into her house.She suffered a fractured skull and a shattered pelvis that's broken in three places."She was lifeless. I was screaming," LaDerihanna's mother, Charlotte Bolton, told CNN.LaDerihanna was hospitalized in critical condition but has since been upgraded to stable, her mother said Tuesday.Bolton said even she felt the impact of the crash from inside the house."I heard a very bad sound, and my house shook like an earthquake," the mother said. "I immediately knew something was wrong. I screamed, 'My baby!' because I knew she was on the porch."She raced to the front lawn, where "a lady had gotten my baby from between the car and my house," Bolton said. "Another gentleman started doing CPR."LaDerihanna's father scooped her up and drove her to the hospital. Bolton followed in another car.As neighbors scrambled to help, the driver of the car fled without checking on the girl."He's caught on camera taking part in this horrific situation that turned into a miracle for this child. I've just never seen anything like this in my entire career," said attorney L. Chris Stewart, who's representing the girl's family.It's also a small miracle that the family had security footage capturing both the crash and the back side of a man who fled the car.The idea for the camera stemmed from a theft at the home."Someone had (stolen) my son's bicycle out of the front yard, and my husband said, 'I'm going to get cameras for the house,' " Bolton said.But a few weeks ago, Bolton's husband thought the camera wasn't needed anymore and canceled the iCloud recording service."And I told him, 'We need those cameras back running.' And if it wasn't for that, we wouldn't have anything," she said.In addition to leaving LaDerihanna critically injured, the car's impact severely damaged the home."This car is deep in my house," Bolton said. "My basement is destroyed."LaDerihanna is trying to stay positive as she recovers from her extensive injuries."She's in a lot of pain, but she's in good spirits," her mother said. "She's a strong little girl. She's talking, she's laughing, she's joking. She's talked to her friends."Bolton said the family is grateful for the "wide outpouring of love and support all across the world.""LaDerihanna wanted me to tell everyone thank you so much for your prayers, your well wishes," she said."To all of her new friends she's gained around the world, she wanted me to say thank you for contributing to her GoFundMe that's in her name that's to pay for her unpaid medical bills, her rehabilitation and long-term care."By Wednesday night, donors had contributed more than ,000 to the 3932

  

“I reached out ... to find out what it would cost to financially support people who aren’t going to be able to come to work.” –Mark Cuban on his plan for Mavericks employees during the NBA suspension pic.twitter.com/McOl1vHUqO— ESPN (@espn) March 12, 2020 268

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