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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) - A fire broke out Friday at a home in the Talmadge area.Sky10 was above the home in the 4600 block of 50th at Madison Ave. about 4:30 p.m.Firefighters found flames and smoke at the home when they arrived.The home was vacant when the fire broke out. No roads were closed in the area.San Diego Fire-Rescue teams did not immediately release what caused the fire.Crews requested an arson investigator and SDG&E assistance at the scene.   483

(KGTV) - A NASA astronaut with a special tie to San Diego is preparing for her trip to the International Space Station. Wednesday morning, 10News Anchor Jim Patton spoke to Dr. Jessica Meir, who earned her Doctorate in Marine Biology at the Scripps Institution of Oceanography. She’ll be taking her first space flight as part of the next crew going to the ISS. "There is definitely a Scripps Institution of Oceanography flag as well as some other items from San Diego," said Astronaut Jessica Meir, speaking from Star City, Russia, where she's been training for the past year and half. She'll be applying her scientific skills to a myriad of experiments some 250 miles above the earth. "We will be on board for about six months,” said Meir. “That's the average length of a space station mission these days. And we will be conducting all kinds of scientific investigations, ranging from how our blood vessels and arteries are actually thickening and stiffening in response to the spaceflight environment. And how it affects all of our physiological systems." Meir says the research is part of the quest to send humans to Mars. Much of the work is at the leading edge of science but some is as practical as your kitchen. "Do we have a progress for trash?" Meir can be seen asking a fellow crew member as they train on a mock-up of the space station. "Where do you think we're keeping trash right now?" While very down to earth, Meir says all the training is very necessary. "When we have anything that breaks, like a toilet or need to change a light bulb, we can't call a plumber or electrician. We have to do all that stuff ourselves as well." Of course, all of this amid a little background fact: it requires the guts to blast-off from the comforts of Earth into the ultimate hostile environment of space. "How do you have the courage inside to do something like that,” asked Patton. "I think the biggest answer is the amazing training here on the ground," answered Meir. "The teams in Houston, all over NASA, and here in Russia as well. They prepare us for any situation." Jessica Meir and her crew are scheduled to take off from Russia on Sept. 25. They'll reach the ISS six hours after lift-off. 2207

(KGTV) - Have tens of thousands of people really signed a change.org petition calling for Danny Devito to play Wolverine in a potential X-Men reboot?Yes.There's an active petition calling for the 74-year-old, 4'10" actor to play Wolverine in a rumored new X-Men film in the works.So far, no comment from Disney.At last check, around 30,000 people had signed the petition.DeVito's only role in the super hero genre was playing the Penguin in 1992's "Batman Returns." 473

(CNN) -- Maui residents who evacuated their homes because of a wildfire are allowed to return, the County of Maui announced Friday on Facebook.But Maui County Mayor Michael Victorino cautioned that, "This fire is still an active threat to our community, and residents are urged to remain vigilant of changing conditions," in the same post.Firefighters will continue to monitor the blaze that has consumed an estimated 10,000 acres of fallow former sugar cane and dry brush, according the county.The fire was reported Thursday morning at 10:42 a.m. local time near the intersection of Waiko Road and Kuihelani Highway.The County of Maui activated its Emergency Operations Center in the morning. By afternoon, the flames were burning out of control and emergency officials sent a mobile alert warning nearby residents to evacuate.More than 600 people fled as the blaze scorched 3,000 acres, the mayor's office said. The Maui Humane Society moved its animals in crates and kennels to a nearby high school.Helicopters were grounded after sunset, and they are expected to return to making air drops after sunrise, according to a news release from the county.Oprah Winfrey has a home in the county, and tweeted a local resident to confirm that she's given officials fighting the fire access to her private road. "A big mahalo to Oprah for giving Maui County access to your private road for use to assist in the Maui fire," Hawaii Gov. David Ige tweeted.Flights at Kahului Airport were briefly diverted, but operations have returned to normal. The fire affected access to the airport, which was operating on emergency generators. The Hawaii Tourism Authority advised visitors heading to or from the airport to contact their airlines for flight status due to power issues. 1773