Why can’t I see the other side if I look up?

Because light bends upwards towards the center of the Earth cavity. You could see the other side if you looked at the horizon (not upwards) with super sensitive eyes and lower frequencies of light which is what polar satellites have been theorized to do in a concave Earth.

bendy-light-fog
All light bends up to the center of the cavity. Light rays further away from the source are “straighter”, but much weaker, and would require more sensitive equipment to detect.

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