Context: https://www.reddit.com/r/askscience/comments/uruuh8/if_spaceships_actually_shot_lasers_in_space/?utm_medium=android_app&utm_source=share
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Light is a form of energy.
The further light has to travel, the more energy it loses across the distance.
You can compare it to a full sized pencil and a half worn down pencil.
The full sized pencil will be able to draw a longer line than the half sized one.
Light is not infinite, it is generated from a source. The stronger the source, the brighter the light will be (check lumens on your lightbulb for a scale)
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