内蒙古高级着装式老年行动模拟服(阳江表面血管结扎止血模型) (今日更新中)

A mysterious cigar-shaped object spotted tumbling through our solar system last year may have been an alien spacecraft sent to investigate Earth, astronomers from Harvard University have suggested.The object, nicknamed 'Oumuamua, meaning "a messenger that reaches out from the distant past" in Hawaiian, was first discovered in October 2017 by the Pan-STARRS 1 telescope in Hawaii.Since its discovery, scientists have been at odds to explain its unusual features and precise origins, with researchers first calling it a comet and then an asteroid, before finally deeming it the first of its kind: a new class of "interstellar objects."Now, a new paper by researchers at the Harvard Smithsonian Center for Astrophysics raises the possibility that the elongated dark-red object, which is 10 times as long as it is wide and traveling at speeds of 196,000 mph, might have an "artificial origin.""'Oumuamua may be a fully operational probe sent intentionally to Earth vicinity by an alien civilization," they wrote in the paper, which has been submitted to the Astrophysical Journal Letters.The theory is based on the object's "excess acceleration," or its unexpected boost in speed as it traveled through and ultimately out of our solar system in January 2018."Considering an artificial origin, one possibility is that 'Oumuamua is a light sail, floating in interstellar space as a debris from an advanced technological equipment," wrote the paper's authors, suggesting that the object could be propelled by solar radiation.The paper, written by Abraham Loeb, professor and chair of astronomy, and Shmuel Bialy, a postdoctoral scholar, at the Harvard Smithsonian Center for Astrophysics, points out that comparable light-sails already exist on earth."Light-sails with similar dimensions have been designed and constructed by our own civilization, including the IKAROS project and the Starshot Initiative. The light-sail technology might be abundantly used for transportation of cargos between planets or between stars."In the paper, the pair theorize that the object's high speed and its unusual trajectory could be the result of it no longer being operational."This would account for the various anomalies of 'Oumuamua, such as the unusual geometry inferred from its light-curve, its low thermal emission, suggesting high reflectivity, and its deviation from a Keplerian orbit without any sign of a cometary tail or spin-up torques."'Oumuamua is the first object ever seen in our solar system that is known to have originated elsewhere.At first, astronomers thought the rapidly moving faint light was a regular comet or an asteroid that had originated in our solar system.Comets, in particular, are known to speed-up due to a process known as "outgassing," in which the sun heats up the surface of the icy comet, releasing melted gas. But 'Oumuamua didn't have a "coma," the atmosphere and dust that surrounds comets as they melt.Multiple telescopes focused on the object for three nights to determine what it was before it moved out of sight. 3063

A North Texas woman took her battle against breast cancer public, allowing the world a front row seat in the operating room while doctors perform her lumpectomy.Before heading to the hospital today, DeSoto resident Sonia Johnson spent a lot of quiet time with her family. But this morning the 50-year-old will be seen by the world as she undergoes breast cancer surgery live on Facebook.It was last December when, during a routine visit to the doctor, Johnson found out she had a tumor on her breast. It was in that moment that she became determined to use faith and positivity to beat a disease that affects one in eight women.“It’s an emotional journey, but you can’t sit,” she said. “You’ve got to be mentally ready to walk this journey. It’s a fight, it’s a fight all the way.”Johnson found she’s not alone in her fight and has gotten scores of supportive messages from breast cancer survivors — forming a sort of sisterhood. She says sharing her journey on Facebook is one way she can help others fighting the same battle.Breast surgical oncologist Allison DiPasquale, MD, will be performing the surgery. She spoke about her admiration for Johnson when talking with CBS 11 News. “This patient is courageous, she’s amazing. She’s putting her body out there for people to say, ‘Wow, I’m going to go get my mammogram and I’m going to make sure I don’t have cancer.’”Johnson said she hopes that by sharing her experience online others will get a better understanding about one of the breast cancer treatments available.“Other people paid it forward before me and now I’m pushing it and paying it forward for somebody else,” she said.During Johnson’s procedure, doctors will go through her armpit to remove her lymph nodes and cancer through the same incision and when the surgical gloves and gowns are gone Johnson plans to join that sisterhood of breast cancer survivors.“I will be able to say ‘I had cancer’. Right now I say I have cancer. Tomorrow [it will be] I ‘had’ cancer.”Breast surgeons and radiation oncologists will be in the operating room during Johnson’s lumpectomy to answer questions from Facebook users in real time. 2142

A New Mexico family found out quickly how tough it would be to travel during the pandemic.Kylah Guerra was just 20 weeks into her pregnancy when doctors diagnosed her baby, Emerie, with lung lesions in the lower respiratory tract. That was back in March at the start of the pandemic.Getting the proper care for their daughter would mean Kylah and her husband would not only need to travel to Children's Hospital Colorado but would temporarily need to live nearby.“They did let me know that since we are so far that they didn't want us, me, to be travelling back home. So, he pretty much said that day you're going to be living in Colorado until you deliver,” said Kylah.Doctors say Emerie showed no symptoms when she was born June 24.The family returned to New Mexico for a couple days but returned less than two weeks later when Emerie had trouble breathing.Due to the pandemic and the nature of Emerie's condition, getting back to Colorado meant they had to go by emergency helicopter.“In the moment, we were trying to get her what she needed. Our main priority was just getting her back to where we knew they could help her. Once we seen, the flight crew arrived at our hospital. It was like a little bit of a relief,” said Kylah.The surgery was successful, and doctors removed the lesions.Meanwhile, the pandemic hasn't slowed the number of surgeries done at the Colorado Fetal Care Center at Children's Hospital Colorado, because they are considered essential. The hospital has seen a 61% increase in surgeries over the same time last year. About 81% of patients seen in the fetal care center are from out of state. 1628

A protester was accidentally run over and killed by a car during a demonstration over rising fuel prices, a top official in eastern France said Saturday.Mass demonstrations causing roadblocks across the country are part of the "gilets jaunes" or "yellow vests" movement, which opposes mounting gas prices and eco-taxes on polluting forms of transport.The death occurred when a driver "panicked" and ran over someone after arriving at a blockade for an undeclared protest not far from the city of Lyon, Louis Laugier, the prefect of the Savoie region, said at a news conference.A further 227 people were injured -- six severely -- in protests across the country, and 73 people were taken into police custody, the Interior Ministry said in a statement. Five police officers suffered slight injuries, and one was severely injured. Another five gendarmes were hurt as well.Speaking about the death, French Interior Minister Christophe Castaner said: "That's the reason why we were worried to have people (who are) not experienced organizing protests."Ecology Minister Fran?ois de Rugy called on citizens to "respect caution and safety recommendations" in order for protests to go ahead "without a new tragedy," in a tweet Saturday. He also offered his condolences to the family of the victim.More than 1 million people were expected to turn out Saturday for demonstrations across the country. Partway through the day, the numbers were much lower than that.About 280,000 people participated in more than 2,000 demonstrations, the Interior Ministry said."Honestly we're satisfied, even if it's true we are not hundreds of thousands people here, but still, people have come. The day is not over yet, and we're glad that there are no incidents here," Thierry Paul Valette, who helped organize a protest on the Champs Elysées in Paris, told CNN."We can't stand Macron's taxes any more. It's too much. We couldn't make ourselves heard through political parties or trade unions, so we had to do something."The protest was billed as likely to be one of the toughest tests yet of Emmanuel Macron's 18-month-old presidency.Website blocage17novembre said protests were planned in all 95 of France's mainland departments, while a petition on change.org calling on the French government to lower the cost of fuel has gotten more than 850,000 signatures.In addition to concerns over spiraling fuel prices, the protests also reflect long-running tensions between the metropolitan elite and rural poor. 2490

A pedestrian photographs the White House through a fence covered in protest signs, Monday, Nov. 2, 2020, on a section of 16th Street renamed Black Lives Matter Plaza in Washington, on the day before the U.S. election. (AP Photo/John Minchillo) 251

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