What is the origin of the universe?

What is the origin of the universe? One of the most intriguing questions that have made ​​us: How was the universe before the Big Bang, the theory physicists today, came the universe? For those who do not know, we clarify that the Big Bang theory says the following: that first of all that is therein, star constellations, planets, comets, satellites, etc. .., there was a point focusing all existing matter, so even with a high density. At any one time there was an explosion, causing the matter in this point spread and to mix, forming all the existents and expansion movement in the whole universe. This movement will stop one day because the gravitational force, and all matter in the universe back to the original point. This all around the spilled material will be called the Big Crunch. To better understand what we describe above, just imagine a cannonball being launched here in the vertical direction of the earth to heaven. The initial rate where the bullet is always greater left by any other route point. This is because after aa initial explosion that threw the ball up, a gravitational force will be exerted to bring the bullet back to the starting point. This initial explosion that threw the ball toward the sky would be the Big Bang. The back of the bullet toward the earth would be the Big Crunch.