### IntroductionThe universe is an awe-inspiring and mind-boggling expanse that stretches beyond human comprehension. For centuries, scientists and astronomers have sought to unlock its mysteries, revealing astonishing facts about its size, structure, and the sheer enormity of time and space it encompasses. Even with our advanced technology and scientific understanding, the universe's size often remains difficult to truly grasp.
### The Observable UniverseTo frame our understanding of the universe's size, it's beneficial to start with the concept of the observable universe. The observable universe is defined as the region of space that we can see from Earth, limited by the speed of light.
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