It’s just like in a night you can easily see things that shine themselves, but to see other things you need something to shine light on them and illuminate them. As pluto is very small and very far away, then only a small fraction of the Suns light shines on it, making it very, very dim.
It’s like in a night with flashlight, you can only see so far, as father objects are the more dim they are, and at some distance they are essential as black as parts that are not lit by flashlight. But your flashlight can be seen from much greater distance.
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