Inside the core of a star thermonuclear fusion reaction fuses hydrogen atom into helium releasing massive heat/light and energy.When a black hole eats up enough stars and gases it devours itself by releasing leftover gases and radiation {nothing but energy} called Quasar.
In both the cases there's massive amount of energy involved.I keep hearing the word "Pure Energy" instead of just "Energy". What is pure energy? How is it different from just energy?
Answer
Please note: I am not an astronomer - astronomers, please call me out if I am mistaken.
'Pure energy' is one of those terrible science journalism phrases that usually refers to hard electromagnetic radiation. Energy is a property of light and matter and not a substance in itself. In nuclear fusion, nucleons combine to form bound states with lower total energies than their separate components and the difference is mainly released as high energy photons and neutrinos.
Black holes do not devour themselves when they get too big. A quasar is an active galactic core, where a supermassive black hole at the center of a galaxy is accreting huge amounts of matter. This releases a lot of radiation in two ways - the accretion disk gets very hot and glows in the x-ray region, whilst the characteristic polar flows of a black hole are streams of gas/plasma moving at relativistic speeds which will light up whatever they collide with.
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