The overall amount of energy output per second from the sun increases over its lifetime.
This overall increase in energy is termed luminosity.
The core of the sun is made of Helium while the shell is made of Hydrogen.
Both core and outer shell are burning constantly at a rapid rate.
Due to this burning effect, the sun looks brighter, shiner, and luminous.
Helium accumulates at the core and due to the growing core, the hydrogen in the outer shell burns speedily thus enlarges the core.
Sun releases almost 3.78 x 10^26 Joules of energy per second and this will continue to release for another 5 billion years.
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