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(CNN) -- President Trump is giving most federal workers the gift of an extra day off this holiday season.The president issued an executive order Tuesday ordering that all executive departments and federal agencies close on Tuesday, December 24 in honor of Christmas Eve.The holidays for federal employees include Christmas Day, but not Christmas Eve.Certain employees, or "emergency employees," will have to work that day "for reasons of national security, defense, or other public need."News of an extra day off comes after Congress recently approved 12 weeks of paid parental leave for all federal employees for the first time in American history. The legislation heads to Trump's desk for his signature. 714

(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) - Disneyland isn’t just any theme park; its charm comes from the unique touches and hidden features that engage visitors. Star Wars: Galaxy’s Edge is sure to delight fans with its ability to transport them out of this world. 10News explored the planet of Batuu and found features guests will want to experience on their first visit. Walt DIsney Imagineers who created the new land traveled to Morocco and Turkey to experience open-air markets to create the Marketplace section of Galaxy’s Edge. They also examined George Lucas’ private archives to study artwork by Ralph McQuarrie, who helped create the look of Star Wars. PHOTOS: Check out cool features at Disneyland's Star Wars: Galaxy's EdgePrincess Leia freshened up after her near-fatal experience in a Death Star trash compactor. Fans of her final scene look from "A New Hope" can purchase her massive silver necklace in the Den of Antiquities, one of Batuu's stores.The devotion to authenticity is reflected in the rusty, industrial, and lived-in look of Batuu.... even down to the bathrooms.MORE 'GALAXY'S EDGE': 1086

(KGTV) - Is cell phone use causing young people to grow horns on the back of their skulls?That is unproven.Research published this month claims people are developing horn-like spikes on the back of their skulls because they're tilting their heads forward while looking at phones or tablets.But the New York Times points out the study lacked a control group.Two surgeons also told the paper that bone spurs from leaning forward aren't nearly as big a deal as possible disc disease, neck misalignment, and permanent changes in posture.This question was submitted to us by Alanna Cate from Sabre Springs. 609

(KGTV) - A San Diego homeless advocate known as “Waterman Dave” died Monday after a long battle with brain cancer.David Ross, 83, was known for using his own Social Security income to buy water for the homeless. He also found sponsors for portable restrooms. In 2010, Ross filed a lawsuit against a San Diego Police officer who Ross said assaulted him while he was handing out water in East Village. Ross said he suffered a concussion and torn rotator cuff. No criminal charges were filed against the officer.RELATED: No charges filed against officer accused of abusing 'Waterman'Ross' friends did not reveal his cause of death. There is no immediate word of a memorial. 683