The observable universe is the spherical region of space from which light has had time to reach Earth since the Big Bang. Its boundary, the cosmic light horizon, is defined by the finite age and speed of light, and it has a diameter of approximately 93 billion light-years. This horizon is not a physical wall but a conceptual limit, meaning that regions of space beyond it are expanding away from us faster than light can travel, making their light forever unreachable.
2026-05-05 20:43:40
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2026-04-17 19:22:03
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2026-04-17 14:05:03
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محمود حسناوي :
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2026-04-17 13:57:13
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2026-05-10 14:26:35
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