Accessible Universe

The accessible universe refers to the region of space that we can observe and study using our current technology, primarily through telescopes that detect light and other signals traveling through space. Because the universe is expanding, some parts are so far away that their light hasn't had time to reach us yet, making them unreachable with existing methods. In essence, the accessible universe includes everything within our observational reach, limited by the speed of light and the age of the universe, representing the portion of the cosmos we can scientifically explore and understand.