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(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) - Did Delta really post fliers encouraging workers to buy a video game console instead of paying union dues?Yes.Delta also posted a similar poster encouraging employees to spend their money on watching sports instead of dues.The airline admits it's trying to discourage workers from joining the union.The union in question, the International Association of Machinists and Aerospace Workers, calls it "union busting propaganda." 442

(KGTV) -- Foot Locker is helping voters get a leg up this election year.The athletic retailer is partnering with the nonprofit Rock the Vote to turn all of its U.S. stores into temporary voter registration sites.Beginning Sept. 22, Foot Locker will have registration kiosks with a website where visitors can check their voter status, register to vote or sign up for election reminders.The company has more than 2,000 stores in the U.S., including seven locations in San Diego County.Foot Locker says the initiative is targeted at the more than 4 million young Americans eligible to vote this year. CEO Richard Johnson said the goal is to “educate and amplify the voices of today's youth.”Kids Foot Locker, Lady Foot Locker, Champs Sports, and Footaction will also house kiosks. 785

(KGTV) - Fact: students with involved parents, no matter their income or background, are more likely to:Earn higher grades and test scores, and enroll in higher-level programsBe promoted, pass their classes and earn creditsAttend school regularlyHave better social skills, show improved behavior and adapt well to schoolGraduate and go on to post-secondary educationIs your child in a position to succeed? Are you in a position to help? Much of what you need for a positive start to the school year is available online, if you know where to look. 10News has done the navigation for you and put together this web guide for your district.District OverviewVista Unified School DistrictEd-Data provides you with interactive, at-a-glance information about your district, including:Student DemographicsStudent PerformanceLocal Revenue ElectionsFinancial DataSchool Directory/District MapsClick here for a list of schools in the districtNew to the district? Click here to find your school by address.Bell Times/Bus InformationWhen does school start? When do classes end? And when does the bus show up? Here are the links you need, including how to get in touch with the Transportation Department.Bell timesTransportation Services: Parent informationSchool MenusClick here for nutrition services information and menus.Parent PortalClick here for the District's main parent resource page. Turn to this website for information about important district forms, engagement opportunities, and parent FAQs.AccountabilityIs your school showing academic progress? How much is the district paying its administrators? How many discipline problems are there in the classroom? 10News has collected the data to help hold your district accountable.Transparent California: District Salary DataSchool Accountability Report Cards (SARC)School BoardThe Board of Education provides policy and financial oversight for the district.Main Page 1919

(CNN) -- President Donald Trump in a statement on Saturday said late al Qaeda leader Osama bin Laden's son Hamza bin Laden had been "killed in a United States counterterrorism operation in the Afghanistan/Pakistan region."He did not give a time period for the operation or the death."The loss of Hamza bin Ladin not only deprives al-Qa'ida of important leadership skills and the symbolic connection to his father, but undermines important operational activities of the group," the President said in the statement.Trump also said "Hamza bin Ladin was responsible for planning and dealing with various terrorist groups."CNN previously reported on July 31 that the US believed Hamza bin Laden was dead, citing a US official. The official told CNN at the time that the US had a role in this death but did not provide details.CNN terrorism analyst Paul Cruickshank told CNN at the time that one thing puzzled researchers who are closely tracking al Qaeda: "If Hamza bin Laden has indeed been dead for months, you would expect al Qaeda to have released some form of eulogy before today. The fact they haven't is highly unusual, given his status in the group."US Secretary of Defense Mark Esper also appeared to confirm in a Fox News interview in August that Hamza bin Laden was dead.Earlier this year the US State Department called bin Laden, who was believed to be in his early 30s, an "emerging" leader in the terror group, offering a million-dollar reward for information leading to his capture.The State Department said items seized from the elder bin Laden's hiding place in Pakistan during the US Navy SEAL raid in 2011 that resulted in his death indicated he was grooming Hamza bin Laden to replace him as al Qaeda's leader.Saudi Arabia revoked Hamza bin Laden's citizenship, official newspaper Um al-Qura reported earlier this year, citing a royal order issued to the Interior Ministry. 1896

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