Scientists have recently discovered the largest black hole  ever recorded. Based on the way stars die and evolve in the Milky Way, they never thought that a black hole could be this large. The mass of this black hole is 70x of the sun. While the sun is 109x bigger than the earth, and is 92.96 million miles from the earth, the black hole, named LB-1, is 15,000 light years from Earth.

“Black holes of such mass should not even exist in our Galaxy, according to most of the current models of stellar evolution,” Liu Jifeng, a professor from the National Astronomical Observatory of China said in a news story. “Now theorists will have to take up the challenge of explaining its formation.”

Black holes form when a star runs out of fuel and collapses on itself, creating a gravitational pull that prevents anything from escaping. During this process, stars lose much of their mass, making black holes that diminish most of their size.

LB-1 was discovered using China’s Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST), which helped scientists find an estimated 100 million black holes.