肇庆中医症候模拟人系统(四川十四经穴模型) (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

The CDC is investigating an alarming new trend that's sending people to the hospital across the country for lung issues. Doctors are reporting a spike in severe pulmonary illnesses possibly relating to e-cigarette products or vaping. There are now more than 150 cases in at least 16 states. One of those cases was 18-year-old Chance Ammirata, who ended up in a Florida hospital after he felt pain in his chest. “It was almost as if I was having a heart attack and I couldn't breathe,” he describes. It turns out his lung collapsed, which doctors say could have happened from something he inhaled. The teen blames vaping, which he started about a year and a half ago. “I didn't think vaping could have that effect on my lungs,” he says. In Texas, 17-year-old Trystan Zohfeld spent 18 days in the hospital and lost nearly 30 pounds after his lung failed. His doctors also believe vaping could have played a factor. According to the CDC, since June vaping has been linked to more than 153 mysterious cases of lung disease, spreading from coast to coast, in at least 16 states. The common link: vaping products that contain either nicotine or THC. “We've seen the damage and the dangers of nicotine addiction, but now, we see the possibility of lung problems and others,” says John Schachter with the Campaign for Tobacco-Free Kids. Health advocates are pushing for the FDA to implement tougher restrictions, including a ban on flavored e-cigs, saying they target children. “Why are we waiting, God forbid, for a fatality? These are children. It's our job to protect them,” says Meredith Berkman, with Parents Against Vaping E-Cigarettes (PAVE). The American Vaping Association issued a statement saying in part, "the evidence continues to point to street-bought vaping cartridges containing THC or synthetic drugs as being the cause of these illnesses.” Meanwhile, Ammirata hopes telling his story will lead to more awareness.“I have thousands of messages of people telling me they quit due to my story, but more importantly due to their bravery,” the teen says. 2075

A collection of stars will participate in the telling of a political drama filled with intrigue, foreign adversaries and dreams of power.It's not Shakespeare: It's the Mueller report, adapted for the stage.Stars such as Julia Louis-Dreyfus, Mark Hamill, John Lithgow and Alyssa Milano will perform Monday night in a play based on the special counsel's report into Russian interference in the 2016 election."The Investigation: A Search For the Truth in Ten Acts," will be live streamed at 9 p.m. ET Monday, 518

A federal judge rejected a challenge to the Trump administration's ban on bump-fire stocks Monday.United States District Judge Dabney L. Friedrich ruled against the plaintiffs in two consolidated federal lawsuits challenging a nationwide ban on the devices and asking for an injunction to prevent the ban from going forward and being enforced.Bump-fire stocks came under scrutiny following a deadly 2017 massacre in Las Vegas, in which a gunman rigged his weapons with the devices to kill 58 people and injure nearly 900. The Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) responded, in part, by reconsidering its definition of machine guns to include "bump-stock-type devices."Bump stocks, also known by the brand name Slide Fire, modify rifles, 771

#tornado damage near Linwood, KS #kswx @NWSKansasCity pic.twitter.com/nkIoBxjJCq— Jesse Risley ?????????? (@Jesse_Risley) May 29, 2019 146

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