Refiloe edited subsection_this_would_be_1__1.tex  over 8 years ago

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\subsection{this would be 1.2} \subsection{Black holes and Active Galactic Nuclei}  It is widely accepted that there is a supermassive black hole (SMBH ) (with a mass ranging from 105 – 1010 solar masses) at the centre of every galaxy , though the there is some uncertainty about how these black holes are formed. Black holes are regions of space-time exhibiting strong gravitational pull. According to (A Loeb) a black hole is the end product from the complete gravitational collapse of a material object, such as a massive star. The black hole is responsible for the mass concentration at the centre of each galaxy. Black holes found at the centre of galaxies are referred to as Super Massive Black Holes (SMBH). SMBH grow by merging with other black holes or by accretion of matter which is the process of attracting mater via a gravitational force leading to a growth of the attracting agent.