How much of the entire universe is blocked from direct view at any specific moment by Earth's physical body?
Answer
Half of the entire universe from view.
The physical presence of the Earth acts as a massive, opaque barrier relative to the observer. When an individual is observing the night sky, the stars located on the opposite side of the planet are physically blocked by the Earth beneath their feet. Therefore, at any given instant, the planet itself prevents observation of half of the total celestial sphere, effectively cutting the potential visible star count in half purely due to geometry.
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