what is a black hole and why are they important
A black hole is a region in space where the pulling force of gravity is so strong that light is not able to escape. The strong gravity occurs because matter has been pressed into a tiny space. This compression can take place at the end of a star's life. Some black holes are a result of dying stars.
As a pair of black holes spirals around one another, they can spin in the same direction or they can be completely different. This is the first time that we have evidence that the black holes may not be aligned, giving us just a tiny hint that binary black holes may form in dense stellar clusters, said LIGO researcher Bangalore Sathyaprakash of Penn State and Cardiff University.