四川头面部自主神经分布电动模型(襄樊胎儿妊娠发育过程模型) (今日更新中)

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

A helicopter crash-landed on the roof of a midtown Manhattan building Monday, sparking a fire and killing one person believed to be the pilot, New York City officials said.Mayor Bill de Blasio said there was no indication that the crash was an act of terror, and he said there were no injuries to anyone in the building or on the ground."I want to just say, thank God for that. This could have been a much worse incident," he said.The helicopter took off from the 34th Street heliport at about 1:32 p.m., NYPD Commissioner James O'Neill said, and it crashed on the roof of 787 Seventh Ave. about 11 minutes later.A fire broke out when the helicopter crashed, and the FDNY reached the roof and put out the fire quickly, FDNY Commissioner Daniel Nigro said.The deceased pilot has been identified as Tim McCormack, law enforcement sources said. His family has been notified, according to one source.O'Neill could not say whether the pilot made an emergency call from the Agusta A109E helicopter."That's part of the investigation, to see if there was any contact made with air traffic control," he said.At the time of the incident, moderate to heavy rain was falling in the city and visibility at Central Park was down to 1.25 miles. Winds were from the east at 9 mph.Based on interviews the NYPD conducted at the 34th Street heliport on Manhattan's east side, the pilot was waiting out the weather but for some reason decided it was okay to go, another law enforcement source told CNN.The pilot then flew around Battery Park on the southern tip of Manhattan, up the west side of the island and then, somewhere around the streets in the 40s, started to veer toward midtown Manhattan before ultimately crash landing, the law enforcement source said."The helicopter is pretty obliterated at this point," de Blasio said in an interview with CNN. "It was obviously a very hard hit, there was a fire on top of that. There's not much left of that helicopter. But look, we don't know what happened and why it happened, this is very unusual."The Agusta 109E is an eight-seat, multipurpose helicopter manufactured in both single and twin-engine variants.The National Transportation Safety Board said it is sending an aviation safety investigator to investigate the crash.'You could feel the building shake'Several witnesses in the building said they felt the building shake and then were told to evacuate.At the time of the incident, moderate to heavy rain was falling in the city and visibility at Central Park was down to 1.25 miles. Winds were from the east at 9 mph.Lance Koonce said he heard something that sounded like a helicopter flying very low, and when he looked out the window he saw a sheet of flame and smoke."It was over pretty quickly, and even the smoke did not last long," he said.Nathan Hutton, who works in the building, told reporters about the chaos in the building as people tried to evacuate."It took a half hour to get from the 29th floor down to the ground floor. There were just too many people, it was too crowded, and everybody was trying to get off on all the floors at the same time," he said."You could feel the building shake, and you could actually hear the alarms."He said when alarms went off, security told people to evacuate the building via the stairs and not the elevators. "We could feel it when it hit but no one knew what it was," he said.Cuomo said the incident brought back memories of the September 11, 2001, terrorist attacks for New Yorkers."If you're a New Yorker, you have a level of PTSD from 9/11," he said. "And I remember that morning all too well. So as soon as you hear an aircraft hit a building, my mind goes where every New Yorker's mind goes."President Donald Trump tweeted that he had been briefed on the crash."Phenomenal job by our GREAT First Responders who are currently on the scene. THANK YOU for all you do 24/7/365! The Trump Administration stands ready should you need anything at all," he tweeted.'A debris field that was on fire'The first firefighters were on the scene within five minutes, Thomas Richardson, FDNY chief of fire operations told reporters. The FDNY said firefighters climbed to the top of the 54-floor building to put out the three-alarm fire.FDNY Lt. Adrienne Walsh, one of the department's first responders, described the roof scene as "a debris field that was on fire.""So, I immediately got on the radio to let command know what we had on the roof so they, down below, could start sending the appropriate resources up to us on the roof," she told reporters.Richardson said high-rise buildings present challenges, but the FDNY has ways to work around them."Within half an hour we had water on the fire and most of the fire extinguished," Richardson said.US Rep. Carolyn B. Maloney, who represents the area in Congress, said the building at 787 Seventh Ave. was not equipped with a helipad. She called to ban non-essential helicopters from Manhattan."We cannot rely on good fortune to protect people on the ground. It is past time for the FAA to ban unnecessary helicopters from the skies over our densely packed urban city. The risks to New Yorkers are just too high," she saidHelicopter owner mourns the loss of pilotMcCormack had flown for American Continental Properties, the company that owns the helicopter, for the past five years, according to a company statement."We are mourning the loss of Tim McCormack," the statement said.Nearly five years ago, in October 2014, McCormack was flying a different helicopter over the Hudson River with six tourists on board when a bird struck and broke part of the windshield, according to 5624

A close associate of President Donald Trump's personal lawyer, Rudy Giuliani, has provided a trove of text messages and photos to the House committee leading the impeachment inquiry. Joseph Bondy, the lawyer for Lev Parnas, tweeted Monday that they had “worked through the night” to provide data from two of his client's smartphones to the House Intelligence Committee. The Democrat-led committee subpoenaed Parnas for documents on Oct. 10, the day after news broke that he and business partner Igor Fruman had been arrested by federal authorities while trying to board a one-way flight to Europe.To read the documents, click 638

A Las Vegas woman who has been charged with murder in regards to an incident in which an elderly man was pushed off a public bus has been released on bail.Cadesha Bishop, 25, was released from jail on 0,000 bond on Wednesday. She's due back in court on May 23.Bishop was charged with murder earlier this week following the death of Serge Fournier. The 74 year old man died earlier this month after he was pushed off a public bus in Las Vegas on March 21.Fournier initially refused medical treatment but went to the hospital later that day. On May 3, police were notified that the man had died from his injuries. The coroner ruled his death was a result of the injuries he received from being pushed.Homicide detectives later determined that Fournier had died from injuries sustained after being pushed. 818

A father in Texas is furious at the Flour Bluff ISD because the school sent his son home with a military-style haircut.Fourteen-year-old Wesley Benham is in the Naval Junior Reserve Officers Training Corps (NJROTC) at Flour Bluff High School.He said his instructor shaved his hair off in front of his class on Wednesday -- without his or his parents' permission, so he texted his father to take him out of school early because he says he was humiliated."I said why?" his father, Ken Benham, said. "Then he sent me a picture of his hair and 'I said what happened?' " 578

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