The vastness of the universe is due to the expansion of space itself. In the early stages of the universe, a rapid period of expansion called inflation occurred, causing the universe to rapidly expand and continue to do so. This expansion is ongoing, which is why the universe appears to be endless.
The purpose of the universe is a philosophical question that does not have a definitive scientific answer. However, many scientists believe that the universe simply exists and does not have a specific purpose. Others theorize that the universe may have been created by a higher power or that it exists for the development and evolution of life.
The most widely accepted scientific theory for the beginning of the universe is the Big Bang theory. This theory states that the universe began as a singularity, an infinitely dense and hot point, and expanded and cooled over billions of years to form the universe as we know it today.
The laws of physics that govern the universe are based on fundamental constants such as the speed of light and the strength of gravity. These constants were set during the early stages of the universe and have remained constant since then. The exact reason for these values is still unknown, but they are a key factor in shaping the universe as we know it.
The search for extraterrestrial life is ongoing, but there is currently no definitive answer. The vastness of the universe and the sheer number of planets and stars make it highly likely that there is other life out there. However, the conditions necessary for life to exist are still being studied, and we have yet to find evidence of life outside of Earth.