This is a tough question! According to the results of scientific experiments, the universe was created about 15 billion years ago! This means 15,000,000,000 year ago. We can say this by the understandings of modern science, but still there are intriguing and complex questions.

The creation of the Universe is based on the theory of the Big Bang, and this theory says that about 15 billion years ago a tremendous explosion started the expansion of the universe. At this point, all the matter and energy of space was contained at one point. What existed before the Big Bang is completely unknown and is a matter of pure speculation.

The Big Bang was not a normal explosion but rather an explosion of space within itself, unlike an explosion of a bomb were fragments are thrown outward.

It was a scientist named Edwin Hubble who started the theory of the Big Bang. Hubble made the observation that the universe is continuously expanding. He discovered that a galaxy's velocity is proportional to its distance. Galaxies that are twice as far from us move twice as fast. Another consequence is that the universe is expanding in every direction. This observation means that it has taken every galaxy the same amount of time to move from a common starting position to its current position. Just as the Big Bang explains the origin of the universe, Hubble's observations explain the origin of the Big Bang theory.