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吉林去哪个男科医院切包皮好
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发布时间: 2025-05-30 00:46:30北京青年报社官方账号
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  吉林去哪个男科医院切包皮好   

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

  吉林去哪个男科医院切包皮好   

MOSCOW — The Kremlin says Russian President Vladimir Putin won’t congratulate President-elect Joe Biden until legal challenges to the U.S. election are resolved and the result is official.Putin is one of a handful of world leaders who have not commented on Biden’s victory, which was called by major news organizations on Saturday.However, President Donald Trump’s team has promised legal action in the coming days and refused to concede his loss. He has alleged large-scale voter fraud, so far without proof.When Trump won in 2016, Putin was prompt in offering congratulations, but his spokesman Dmitry Peskov told reporters Monday that this year’s election is different.The leaders of China, Mexico, Brazil and Turkey also are holdouts in offering congratulations.China says it has taken note of Biden's declaration of victory in the election but is holding off on sending any message of congratulations.A foreign ministry spokesperson says the result of the election would be determined under U.S. laws and procedures and that China would follow international practices in extending its sentiments.China has had a fractious relationship with Trump, characterized by growing friction over trade, technology and competition for influence in Asia and the world.Analysts say Biden will likely return ties to a less contentious state, although Beijing has stuck throughout the election to a position of not commenting directly on what it says is an internal American political issue. 1489

  吉林去哪个男科医院切包皮好   

NATIONAL CITY, Calif. (KGTV) — One lucky local struck it rich in a recent SuperLotto Plus drawing, winning a million jackpot.Victor Diaz purchased his SuperLotto Plus tickets from a 7-Eleven at 1601 East 18th Street in National City, according to California Lottery. Although his numbers were randomly chosen, Diaz said he had a good feeling when he saw two of his numbers were 3 and 16, relating it to the Bible verse "John 3:16."His numbers 3, 9, 23, 27, 35 and Mega number 16 ended up being the perfect pick, netting him the million jackpot.The 7-Eleven will also receive 0,000 for selling the winning ticket, the state lottery says.Although Diaz told the lottery he doesn't have plans for the money yet, he and his wife want to buy a house, donate to their church and charities, and start college funds for their children. A family vacation may also be in the cards.Other than that, Diaz said, "We will wait to see what God has planned for us."It wasn't clear if Diaz decided to take the lump-sum payment or annual payments for his jackpot win. 1067

  

MIRAMAR, Calif. (KGTV) - As political tensions rise worldwide, critical training ensuring the U.S. and it's allies are ready runs straight through San Diego.MCAS Miramar hosts everyone from the Canadian Air Force, to NASA. On Wednesday, a NASA research jet took off from the flight line.Part of why Miramar is so critical is it's location. Colonel Charles Dockery, the Commanding Officer at MCAS Miramar, said due to air congestion over land, Miramar's location close to the ocean alleviates that complication."Within one flight's distance from Miramar, we are within 66% of the training air space in the Continental U.S." he said. Some of their training, mimicked in Top Gun. "Not only to take down an adversary or an airplane, but also defend ourselves from their aircraft trying to attack us," he said. Right now, MCAS Miramar is working to remain competitive with nations overseas."We have four major nation state competitors out there, Russia China, North Korea and Iran," Col. Dockery said.If the need arises, he said troops would deploy from Miramar to support the effort to defend the U.S.He said if Miramar didn't exist, it would mean millions of tax-payer dollars to conduct the same training. "When you talk about the amount of fuel burned to get there, just when you talk about the amount of time to get there," he said.Col. Dockery said the base is constantly evolving, with four F-35s coming in January of 2020, and advanced helicopters following in the future. 1483

  

Motorcycle land speed record holder Valerie Thompson survived a 343-mph crash while attempting to break the overall two-wheel record in Australia on Monday, according to Fox News.According to the report, the 49-year-old Thompson was going for the record at the Lake Gairdner World Speed Trials "when something went wrong during her run and the bike fell onto its side, digging a deep trench into the salt flats and spreading wreckage over a mile."Thompson's "Bub 7" motorcycle reportedly lifted off the ground, with its parachutes eventually allowing it to come to a complete stop. Thompson told Fox News that she's "doing OK" and is headed back to Scottsdale to determine what went wrong.Thompson earned the title of world's fastest female motorcycle racer when she topped out at 304.263 mph at the Bonneville Motorcycle Speed Trials in 2016. Known as "America's Queen of Speed," Thompson has won a number of racing awards and was featured in the 2013 documentary "Why We Ride." She is a vehicle presenter at Barrett-Jackson Auction Company and Metro Auto Auctions in Scottsdale, Arizona.  1148

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