The Big Bang Theory
The Big Bang Theory The Big Bang theory is the prevailing scientific explanation for the origin of the universe . According to the theory, the universe began as a singularity, an infinitely dense and hot point in space and time. Around 13.8 billion years ago, this singularity underwent a rapid expansion known as the Big Bang , and the universe has been expanding and cooling ever since. The Big Bang theory is supported by several key pieces of evidence, including the cosmic microwave background radiation , which is believed to be the afterglow of the Big Bang, and the observed large-scale structure of the universe, which is consistent with an initial explosive expansion. One of the most important predictions of the Big Bang theory is the abundance of light elements , such as hydrogen and helium, in the universe . Observations of the abundance of these elements in the early universe are in good agreement with the predictions of the theory. Another key prediction of the Big B...