Pretty simple really my friend, the energy is less the farther you move from it.aura mytha, keep in mind i have to explain that to an 11 year old. so keep it simple if you can
Even though the light at the source, was unimaginably strong .
The effect was proportionally weakened by the square root of the distance from it.
While the fire burned very hot , and you could not stand next to it.
We backed away to where we could.
This is universally a reason why life is not on Mercury , but is on Earth.
A physical reason, and because of our understanding of the inverse square law, we can deduce many things. This is also the reason why , a searchlight has it's limit in distance.
But when we talk about light over great distances , light also requires time to travel.
The reason we cannot see light from the very farthest reaches of space is twin fold.
It maybe hasn't had time to reach us and it maybe have been reduced to undetectable.