http://www.newsweek.com/black-holes-exert-pressure-solving-problem-troubled-albert-einstein-stephen-hawking-1627888

Researchers have found that black holes may exert pressure on their surroundings. The discovery made by a team of astronomers in the U.K. builds on a theory posited by Stephen Hawking in 1974, which suggests black holes give off thermal radiation.

It means that black holes, which are formed when stars three times the size of our Sun run out of fuel and undergo a complete collapse, could be more complex than scientists had previously grasped.