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A cosmic horizon refers to the boundary of the observable universe, beyond which light has not had enough time to reach us since the Big Bang due to the finite speed of light and the expansion of the universe. This horizon delineates the limit of what we can see, meaning that regions beyond it are fundamentally inaccessible and remain unknown. The cosmic horizon is dynamic; as the universe expands, the observable universe grows, allowing us to see more over time.

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Is earths cosmic horizon the same as that of other planets in another galaxy?

No, Earth's cosmic horizon is not the same as that of other planets in another galaxy. The cosmic horizon is determined by the observable universe, which is influenced by the location and motion of an observer. While all observers in the universe share a common cosmic horizon defined by the speed of light and the expansion of space, the specific conditions and distances to celestial objects can differ significantly based on their positions in the universe. Thus, each planet, including those in other galaxies, has its own unique cosmic horizon based on its location in the cosmos.


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