安康可以做四维的医院(安康尿液里有白色沉淀物怎么回事) (今日更新中)

(CNN) -- Scientists have discovered a "monster black hole" so massive that, in theory, it shouldn't exist.It's a stellar black hole — the type that forms after stars die, collapse, and explode. Researchers had previously believed that the size limit was no more than 20 times the mass of our sun because as these stars die, they lose most of their mass through explosions that expel matter and gas swept away by stellar winds.This theory has now been toppled by LB-1, the newly-discovered black hole. Located about 15,000 light years away, it has a mass 70 times greater than our sun, according to a press release from the Chinese Academy of Sciences.The findings were published by Chinese researchers in the journal Nature on Wednesday."Black holes of such mass should not even exist in our galaxy, according to most of the current models of stellar evolution," said Liu Jifeng, head of the team that made the discovery. "LB-1 is twice as massive as what we thought possible. Now theorists will have to take up the challenge of explaining its formation."Scientists are now scratching their heads at how LB-1 got so huge.The Chinese team has proposed a number of theories. LB-1's sheer size suggests that it "was not formed from the collapse of only one star," the study said -- instead, it could potentially be two smaller black holes orbiting each other.Another possibility is that it formed from a "fallback supernova." This is when a supernova -- the last stage of an exploding star -- ejects material during the explosion, which then falls back into the supernova, creating a black hole.This fallback formation is theoretically possible, but scientists have never been able to prove or observe it. If this is how LB-1 formed, then we may have "direct evidence for this process" for the first time, the study said.LB-1 is not the biggest black hole ever discovered -- but it may be the largest of its kind. There are several types of black holes, and stellar black holes like LB-1 are on the smaller side, according to NASA. Supermassive black holes are much bigger -- they can be billions of times the mass of our sun.Scientists believe supermassive black holes may be connected to the formation of galaxies, as they often exist at the center of the massive star systems -- but it is still not clear exactly how, or which form first.Stellar renaissanceStellar black holes are believed to be commonly scattered across the universe, but they are difficult to detect because they do not normally emit X-rays -- only doing so when they gobble up gas from a star that has ventured close enough. They are so elusive that scientists have only found, identified, and measured about two dozen stellar black holes, the press release said.The researchers at the Chinese Academy of Sciences tried a different approach. Instead of looking for X-rays emitted by black holes, the team looked for stars that were orbiting some invisible object, being pulled in by its gravity.Their efforts paid off -- they soon spotted a giant star eight times heavier than the sun, orbiting around what turned out to be LB-1."This discovery forces us to re-examine our models of how stellar-mass black holes form," said David Reitze, a physicist at the University of Florida. In May, Reitze's team made its own breakthrough discovery -- observing the never-before-seen collision of a neutron star and a black hole, which sent out ripples in space and time.These twin discoveries -- the collision, and now LB-1 -- indicate that scientists are reaching "a renaissance in our understanding of black hole astrophysics," said Reitze in the press release.There have been several other discoveries over the past year that have added to this renaissance. In October, researchers discovered what they believe to be a new type of black hole, smaller than the other kinds. And earlier this week, astronomers discovered a black hole that is actually helping baby stars grow instead of destroying them. 3971

(KGTV) — California is taking its time before issuing guidance to allow the state's theme parks to reopen during the coronavirus pandemic.Wednesday, Gov. Gavin Newsom said the state was not planning to issue such guidance soon, despite reports last week that rules that would allow the shuttered locations to reopen would be issued soon.Disney Chairman Bob Iger recently left the state's economic recovery task force, an early indication that business leaders for the industry could be at odds with the state over reopening. According to the Associated Press, Erin Guerrero, executive director of the California Attractions and Parks Association, said amusement park leaders wanted changes to a proposed draft they reviewed this month."There’s disagreements in terms of opening a major theme park. We’re going to let science and data make that determination," Newsom said, adding that he wasn't "surprised at all" that Iger left.Newsom said the state is continuing to work with the industry and would approach theme parks with a "health-first" framework, but was not in a hurry to release rules."We are going to be led by a health-first framework and we’re going to be stubborn about it," Newsom said. "That’s our commitment — that’s our resolve. We feel there’s no hurry putting out guidelines."He added that working to put out appropriate rules would depend on local data."It’s very complex. These are like small cities, small communities, small towns. But we don’t anticipate, in the immediate term, any of these larger theme parks opening until we see more stability in terms of the data," Newsom said.California's major theme parks — including Disneyland, Universal Studios, SeaWorld San Diego, Legoland, Knott's Berry Farm, and several smaller theme parks around the state — have been closed since about mid-March due to the pandemic.Last week, Disney announced 28,000 employees would be laid off as the company struggles with the economic impacts of having its parks closed or under capacity limits. 2014

(KGTV) - A former Coronado Fire Department employee will spend the next decade in prison for child molestation. Mark Price, who was a firefighter for 30 years, was sentenced Thursday for sexually abusing a young family member on vacation in Hawaii last year. The girl and her mother gave their victim impact statements to the judge in Hawaii over the phone. The young victim said she feels very uncomfortable when she’s alone in a room with a man. Her mother said she’s worried how this will affect her daughter as she becomes a teenager, and that this has ruined her daughter’s life. “Mark was her role model, the man figure in her life that she trusted the most and that was all shattered and she has trust issues even with me,” said Dannika Zarghami, who knows the victim. Price faces additional charges related to the same victim in San Diego. He will be in a downtown courtroom Tuesday. 899

(KGTV) — A Fresno man died after not long after taking part in a taco-eating contest at a Minor League Baseball game Tuesday.Dana Hutchings, 41, died shortly after arriving at a hospital following the contest at a Fresno Grizzlies game Tuesday, according to Fresno County Sheriff's Office.ABC-affiliate KFSN reported Hutchings was taken from Chukchansi Park by an ambulance where he had just competed in a taco-eating contest before the game started. According to the Associated Press, a witness said Hutchings appeared to be eating much faster than the other two contestants, swallowing tacos without chewing them.The witness added that Hutchings collapsed about seven minutes into the contest and hit his face on the table as he fell to the ground, the AP said.A cause of death has not been released. Fresno sheriff's spokesman Tony Botti told reporters an autopsy will be performed Wednesday. Botti added that paramedics had to clear Hutchings' airway of food when he was transported, but it wasn't clear how many he had eaten.According to the AP, the Grizzlies has canceled the World Taco Eating Championship scheduled for Saturday at the annual Taco Truck Throwdown. Tuesday's contest, however, was not related to the championship event. 1250

(CNN) -- If California Gov. Gavin Newsom signs a bill passed by the state Senate Friday, state university clinics will be required to offer abortion pills to students as of 2023."The state has an interest in ensuring that every pregnant person in California who wants to have an abortion can obtain access to that care as easily and as early in pregnancy as possible," the bill states.California's legislation comes as several other states are moving to tighten abortion restrictions or to ban them with very limited exceptions."In a time when states across our country are rolling back women's health care and access to abortion, California continues to lead the nation to protect every individual's right to choose," Sen. Connie Leyva, who authored the bill, said in a statement. "SB 24 reaffirms the right of every college student to access abortion."Giving students access to abortion by medication means students won't have to "choose between delaying important medical care or having to travel long distances or miss classes or work," Leyva said.If it becomes law, the initiative would be funded by "nonstate entities, including, but not necessarily limited to, private sector entities and local and federal government agencies," the bill says.There are more than 400,000 women students at California's state university campuses, according to the bill.Former California Gov. Jerry Brown last year vetoed a similar bill. According to the San Francisco Chronicle, Newsom said last year that he would have signed that one. 1533

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