'Doughnuts' are gas fountains of Back hole.

Rings of gas surroundings super massive black holes are not simple doughnut shapes,but dynamic fountains of gaseous matter, according to a new research that may prompt rewriting of astronomy textbooks. Based on computer simulations and new observations from Atacama Large Millimeter/sub millimeter Array (ALMA) in Chile ,researchers have concluded that the gas expelled from the center interacts will in falling gas to dynamic circulation ...