Question

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Answer 1

Answer:

After it sinks below the horizon, Earth blocks your view of it. Even though you know it's still out there in space, you can't see it. Any and all events on the Sun remain invisible to you for as long as it is below the horizon. ... Because of this visual effect, scientists named the boundary the "event horizon".

Explanation:

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Answer 2

Answer:

A. The sun’s disappearance after sunset is similar to the way an object disappears near a black hole.