濮阳东方看男科病评价高(濮阳市东方医院口碑) (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) - A group of San Diego lawmakers, water agencies and business leaders are joining forces in opposition of a possible new state tax on tap water.Under the proposed State Senate Bill 623, Californians would see an additional 95 cents per month on their water bills.SB623 is one of two articles of legislation being discussed by state lawmakers that could see residents’ water bills go up by more than per month.The goal of the tax would be to clean polluted groundwater around the state, particularly agricultural areas where water is considered undrinkable -- with arsenic, lead and nitrate levels that have been compared to Flint, Michigan’s crisis.State Sen. Bill Monning (D-Carmel), who authored the bill, said SB623 "will establish the Safe and Affordable Drinking Water Fund to provide an ongoing source of funding to finance water improvement projects throughout California.The USGS map below show various water sites around California. Click on the map for more information on the sites. Approximately 300 water systems in California currently have pollutant violations, such as arsenic, lead, nitrates, and uranium that have been linked to nausea and vomiting, cancer, reduced mental functioning in children, nervous system decline, miscarriages, and numerous other health issues.Support of the fund will come from a fertilizer mill fee, a fee on dairies, and a fee assessed on water bills of no more than a month per household, and is anticipated to generate 0 million a year. Low-income rate exemptions are provided for households under 200% of the federal poverty level."The State Water Resources Control Board created a map of water pollutant assessments throughout the state. Click on the map below for more data. Numerous agricultural groups and environmental organizations have come out in support of SB623, but many, including the San Diego County Taxpayers Association and other local groups, have said the bill is “counterproductive because it will make it harder for low-income residents to afford this necessity. A precedent-setting tax also could lead to additional taxes on water for a variety of project and programs.” 2175

(KGTV) - Did a grandmother accidentally buy a 30-pack of condoms instead of tea?Yes.76-year-old Rosemarie Riley from Britain says she forgot her glasses when she popped over to the store for some items.She though she was grabbing a box of Yorkshire tea off the shelf. In reality, she picked up a jumbo 30-pack of Durex Thin Feel condoms costing more than .When her husband pointed out the mistake, a mortified Rosemarie asked her granddaughter to return the condoms.Rosemarie says she'll be wearing her glasses the next time she shops and wonders why the cashier didn't say anything when she made the purchase. 621

(KGTV) - A man in a stolen truck led Oklahoma City Police officers on a chase Friday that ended in a rural area.The pursuit started on Interstate 240 in southwest Oklahoma City and continued into Moore, OK, according to KOCO.The truck lost its trailer while going through a field.At one point, another vehicle pulled alongside the truck and a man raised a gun toward the truck.The truck’s driver also stopped to pull a large crate out of the truck bed.10News is monitoring developments in this story. 508

(KGTV) – In a show of solidarity with its basketball counterpart, the Milwaukee Brewers have decided not to play Wednesday’s game following the shooting of an unarmed Black man in Kenosha, Wisconsin, according to local media reports.The Brewers, who were scheduled to host the Cincinnati Reds at home, met as a team hours before the first pitch. The Reds also agreed not to play, according to National Baseball writer Jared Diamond. 440

来源：资阳报