Well, it is a theory, so no one knows for sure if it happened but there is lots of evidence for it like sound waves and how everything in the universe is moving farther apart from each other....Hope this helps.
9 months ago
Last edited at 5:33PM on 3/13/2013
You are all confusing a theory and a hypothesis. A hypothesis is an educated guess , something to be studied and tested via scientific methodology and observation. After a hypothesis has been tested and approved as HIGHLY probable it becomes a theory which is almost a fact. So the Big Bang is a STRONGLY supported theory.