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Today, the consensus among scientists, astronomers and cosmologists is that the Universe as we know it was created in a massive explosion that not only created the majority of matter, but the physical laws that govern our ever-expanding cosmos. This is known as The Big Bang Theory.
Some scientists believed that if our universe was created by a singularity, there would have to be a background heat still in existence in the universe. To understand why a scientist would think there is still heat from the big bang you have to know that the universe is still expanding.n other words, the big bang was the beginning of everything. The big bang theory is not the only model that tries to explain the origins of our universe. There are several other theories, but the big bang is the most popular and well known. Here is a link the the NASA page about the big bang theory.