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2025-05-30 04:33:37
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  濮阳东方医院妇科可靠吗   

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

  濮阳东方医院妇科可靠吗   

MONT BELVIEU, Texas — A Texas judge has ruled a school district’s hair policy is discriminatory after two Black students were suspended for their dreadlocks. According to KTRK-TV, the decision from the judge for the U.S. District Court for the Southern District of Texas came late Monday.The policy was at the center of controversy after a senior at Barbers Hill High School was suspended in January. District officials said it wasn’t about race or that dreadlocks weren’t allowed, just that his in particular were too long. The student was told he could not return to school or walk at graduation unless he cut his hair. He argued that his dreadlocks were part of his Trinidadian heritage.He and another student filed grievances on Jan. 27, followed by a lawsuit. Last month, the school board voted not to change the policy. 833

  濮阳东方医院妇科可靠吗   

Music legend Gloria Estefan and her family are headed to the red table for some honest talk.“Red Table Talk: The Estefans” launches Wednesday at noon ET on Facebook Watch. The show will feature Estefan, her daughter Emily and niece Lili. 245

  

Movie theaters are at risk and some predictions show up to 60% could close, according to the CEO of Studio Movie Grill, Brian Schultz.The big chains are facing obstacles like limited capacity, a lack of new movies, and a slow return by audiences.“The majority of our attendance is these private events we're doing where we rent out an auditorium for 0,” said Schultz.Schultz says revenue is around 20% of what it was last year.The theater chain has new sanitary procedures, increased air flow circulation, added filters, and a system to keep families together but socially distant.“Part of what makes going to a movie theater great is people laughing together, people crying together, reacting and being surprised,” said Schultz.Amy Southgate and her husband started hosting movie night in their driveway at the start of the pandemic. They recently moved it to a private theater.“We have a couple elderly neighbors and like to kind of check in on them and keep them involved since some of their regular activities were canceled during COVID, so it was just a good way to get all our neighbors and friends involved,” said Southgate.Theaters are renting out space where you can watch pretty much any movie, including the classics.“With the current pandemic situation, there isn’t a whole lot for folks to get excited about and look forward to, so this is something we can put on our calendars and get excited to come and do safely,” said Southgate.Theaters allowed private events before the pandemic. Now, they're more affordable.They're banking on a couple of big movies in November to help, including a James Bond film and Pixar’s movie "Soul." 1655

  

NASHVILLE, Tenn. (AP) — Sarah Fuller has become the first woman to score in a Power Five conference football game by kicking an extra point. The goalkeeper for Vanderbilt’s Southeastern Conference women’s soccer champs got her chance on the Commodores' third drive of the game. Fuller, one of three kickers on the depth chart, came out for the extra point that tied the game at 7 late in the first quarter. She put the ball through the uprights and celebrated by pulling her first in before slapping high-fives with teammates with her family celebrating in the stands. An official gave her the ball. Two weeks ago, she became the first woman to appear in a Power 5 football game in a game against Missouri with a kickoff. There have been two previous female Division I college football players, Katie Hnida for New Mexico and April Goss for Kent State.Fuller is coming off the college soccer season, playing in nine games for Vanderbilt. Last month, Fuller helped Vandy’s women’s soccer team to an SEC title by defeating Arkansas 3-1. Fuller had three saves in the match.Fuller is also using the opportunity to raise funds for charity. She will be wearing a sticker on the back of her helmet “Play Like a Girl.” The charity provides STEM education opportunities for young girls. 1286

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