The Big Bang Theory is a scientific explanation for the origin and development of the universe. It suggests that the universe began as an extremely hot and dense singularity, and has been expanding and cooling down ever since.
The Big Bang Theory explains the size of the universe by suggesting that it has been expanding since the beginning of time. This expansion has allowed the universe to grow to its current size of approximately 93 billion light-years in diameter.
There are several pieces of evidence that support the Big Bang Theory, including the cosmic microwave background radiation, the abundance of light elements in the universe, and the observed expansion of the universe.
The current understanding is that the observable universe is approximately 93 billion light-years in diameter. However, it is important to note that this is only the size of the universe that we are able to observe with our current technology, and the actual size of the entire universe may be much larger.
Yes, scientists are constantly conducting research and experiments to further our understanding of the Big Bang and the size of the universe. There are still many unknown aspects and mysteries that scientists are working to unravel in order to gain a deeper understanding of our universe.