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濮阳东方医院治阳痿口碑很高
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发布时间: 2025-05-25 21:07:49北京青年报社官方账号
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  濮阳东方医院治阳痿口碑很高   

At 3 p.m. ET on Monday, November 26, a group of researchers will be really sweating. The NASA InSight spacecraft will try to land on Mars.After six months of flight, the lander component of the probe will detach itself from the cruise stage and head into the atmosphere. The lander component initially looks a fair bit like the re-entry capsule used in the 1960s and 1970s for the Apollo moon missions -- sort of conical, with a smooth and flat bottom. That bottom is a crucial heat shield that is designed to protect the probe as it passes through the thin Martian atmosphere.The landing is a devilishly difficult feat. The landing capsule has to batter its way through the atmosphere. It will fly through the Martian air at an initial speed of 12,300 mph, and it must hit the atmosphere at an angle of precisely 12 degrees. Any shallower, and the probe will bounce off into deep space. Any steeper, and the probe will burn itself up in a spectacular and fiery death. The probe will first touch the atmosphere six minutes and 45 seconds before landing. During this phase, it will experience acceleration 12 times that of the Earth's gravity. Were the probe a 150-pound human, during the flaming descent, it would weigh nearly a ton.About 3? minutes after the probe hits the atmosphere, a parachute will deploy, slowing down the probe even more. Fifteen seconds later, explosives will blow the heat shield off, exposing the actual InSight probe hidden inside. Ten seconds after the heat shield falls away, the probe will extend its legs, much like an airplane extends its wheels before touching down.The probe will fall for an additional two minutes attached to the parachute and protected by its conical shell. About 45 seconds before InSight lands, it will drop out of the shell and fall toward the surface. As soon as it leaves the shell, its landing rockets will ignite.The actual InSight probe looks a little bit like the Apollo moon lander, with three legs to support it and a boxy top. The rockets will slow it further and stop any remaining horizontal motion. Then, about 15 seconds before touchdown, the InSight probe will descend at a speed of 8 feet per second, before hopefully touching down gently on the Martian surface.The entire landing sequence will take about seven minutes to occur. A radio signal from Mars to Earth currently takes about eight minutes and seven seconds to get here. So the complete landing process will take place before we find out if it was successful. It will be done automatically, entirely by the probe itself. For the scientists and engineers who designed InSight, this is called "seven minutes of terror."And they are right to be worried. Mars is a graveyard of failed probes. There have been 44 attempts by various national space agencies to land on Mars. Eighteen have been successful. Twenty-three have not. Three have achieved orbit but failed at a landing.So, what does InSight hope to achieve? Well, as it happens, a lot. But it's different than the intrepid Curiosity probe, which NASA landed in 2012. InSight will not move around. Instead, it will stay put and tell us of the interior of Mars.One thing it will do is emit radio waves that we can monitor on Earth. By making careful measurements of how the frequency of the radio waves change, we will be able to measure the degree to which Mars wobbles as it rotates. That will tell us something about the core of the planet, specifically its makeup and information on the degree to which it is molten.InSight will also deploy a seismometer to listen for marsquakes (like earthquakes, but Martian-style) and for impacts of meteors on the planet. Information gleaned from the waves the seismometer detects will tell us more about the planet's interior.The third thing InSight will do is to dig below the planet's surface. Using a jackhammer, the probe will drill down 5 meters (16 feet) into the planet and, basically, it will take the planet's temperature.There are many reasons this is interesting. Taking the temperature at that depth will allow planetary scientists to determine how much heat is escaping from Mars. More broadly, this measurement will allow a clear determination of the temperature of the planet much closer to the core.This information will tell us a lot about how Mars formed, which, in turn, will add to the information of how rocky planets, including our own Earth, typically develop.And if you're more of an explorer kind of person and not so interested in Martian geology, it will also tell us how warm the planet is at modest depths, which will tell us if there is any chance of liquid water on the planet. Perhaps obviously, if the Martian subsurface is warm enough, any buried water will be in liquid form and not ice. Finding liquid water would be the key discovery that would make Martian exploration relatively easy. A relatively recent possible discovery of a buried Martian lake was promising, but the data was not conclusive. Knowing that the ground is warm would be very comforting to possible future explorers.Exploring the solar system is the first step toward exploring the stars. The InSight probe will give us --well -- insight into whether this is something that humanity will achieve in the foreseeable future.And maybe Elon Musk's bet on him getting to Mars will become true. 5329

  濮阳东方医院治阳痿口碑很高   

As the debate over police defunding wages on in parts of the country, officials in Albuquerque, New Mexico have found a middle ground.Mayor Tim Keller recently introduced a plan to strip the police department of million each year to help create and fund a new department that would respond to certain 911 calls instead of police.He says the city is the first in the country to do this."It’s a public health approach to public safety,” said Keller.The new department would consist of service workers, public health personnel, and specialists who would respond to calls related to homelessness, mental illness, and drug overdoses."For modern history, every city has said we’ll either send police or fire,” said Keller. “It’s about restructuring, institutionally, how we respond.”"We’re not the experts. We go over there and a lot of times our officers don’t know what to do,” added Albuquerque Police Chief Michael Geier.Geirer says the introduction of the new department comes as a relief. His police department is already short-staffed with officers, so handing these calls off to specialized personnel would not only help his department but the public.“We’ll be able to handle the higher-priority calls, and then our response time, and our community engagement," he said. "There will be more trust in the community.”Greier says, to a degree, the Albuquerque Police Department has already started delegating certain calls to the fire department and it has spared officers from responding to nearly 15,000 calls in just the last few months--many of which could keep an officer on scene for hours.“We want to get past responding to the symptom of the root cause,” said Albuquerque Chief Administrative Officer Sarita Nair. “We want to get down to that root cause and start addressing issues there.”Mayor Keller says the move to create the new department was only made recently, so there will be substantial planning and public input before it actually goes into effect. 1979

  濮阳东方医院治阳痿口碑很高   

As the pandemic has stretched on, maybe you have run out of things to watch on your Netflix playlist. Or maybe you have a hard time deciding what to watch when you finally get a moment to relax.The streaming service has a solution: Shuffle Play.The new feature will appear on the main page below your profile icon, according to some users who are already seeing it.Netflix confirmed to TechCrunch.com the button will randomly play content it thinks you will like, it could be a movie or show you are currently watching, something you’ve saved or a title similar to things in your queue.Netflix has experimented with “shuffle” concepts, releasing a sidebar option called “play something” earlier this summer for some users. Last year, there was a shuffle mode that would play random episodes of tv series you liked. 822

  

At least 49 people were killed when a plane approached the runway from the wrong direction, crashed and burst into flames while landing at Kathmandu's Tribhuvan Airport in Nepal on Monday.Flight BS 211, which belongs to US-Bangla Airlines, a privately owned Bangladeshi carrier, was flying from Dhaka, Bangladesh, police spokesperson Manoj Neupane said.There were 71 passengers on the plane including the crew, said Kamrul Islam, the head of public relations for for US-Bangla.Plane crashes at Nepal's Kathmandu airport Forty bodies were recovered at the scene, nine died in hospital and 22 survivors are receiving treatment in hospital after the crash at 2:15 p.m. local time, Neupane said.The passengers were mainly Nepalese and Bangladeshi with one from China and one from the Maldives, Tribhuvan International Airport general manager Raj Kumar Chhetri told CNN. He did not yet know the nationalities of the four crew members.The plane approached the runway from the wrong direction, according to Chhetri."The plane had permission to land from the southern side of the runway but they instead landed from the northern side. Authorities do not know why they did not land from the southern side," Chhetri said.Amanda Summers, a retired American living in Kathmandu, told CNN she saw the crash of flight BS 211 from her rooftop overlooking the airport."I was on my rooftop that overlooks Kathmandu from the top of the valley -- I spend most of my time there -- when I saw the plane flying at very low altitude," she told CNN by phone."It was flying northwards and it was much too low. I thought at first that maybe it was extra cloud cover that was forcing the plane to fly low. Then I saw the plane change direction almost completely and it was flying straight towards us. Then it lost more altitude and finally crashed."I saw one spark, or flash. Then seconds later I saw another bigger one. It was almost as if the plane might have bounced. Then no more light but a tall billow of thick black smoke rose in the air," she added."We had done boarding, waiting to take off and then a 70-seater ATR plane was approaching to land and everyone in our plane started to look towards it. And then 30 second later there was smoke," traveller Shradha Giri, who was at the airport waiting for a domestic flight, told CNN.ATR is a Franco-Italian aviation company known for its turboprop planes.According to Flightradar24, the plane was a Bombardier Dash 8 Q400, which the company describes as "the world's most modern turboprop."The-CNN-Wire? & ? 2018 Cable News Network, Inc., a Time Warner Company. All rights reserved. 2624

  

As part of regular protocols, Secretary @stevenmnuchin1 has been tested daily for COVID-19. He tested negative for COVID-19 this morning and will continue to be tested daily.— Monica Crowley (@TreasurySpox) October 2, 2020 230

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