Close your eyes and visualize the sun setting over a beach.

How detailed was your image? Did you envision a bland orb sinking below calm waters, or did you call up an image filled with activity -- palm trees swaying gently, waves lapping at your feet, perhaps a loved one holding your hand?

Now imagine you're standing on the surface of Pluto. What would a sunset look like from there? Notice how hard you had to work to imagine this

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