Is all of our universe… lit? Can you be hurtling through space and accidentally fly head first into a planet because oops you didn’t have your headlights on?
In: Physics
Light permeates the entire observable universe, so technically everything is “lit.” But even in our own solar system, the objects in the Kuiper belt are very faint because light is governed by the inverse square law (light dims by distance squared). So, it would depend on what type of sensors you have, but objects in interstellar space and especially intergalactic spece would be very close to perfectly dark in the visible spectrum.
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