HOW WAS THE UNIVERSE CREATED ?

How was the universe created? For centuries scientists thought the Universe always existed in a largely unchanged form. But a Belgian priest and scientist called George Lemaitre put another idea. In 1927, he proposed that the Universe began as a large, pregnant and primeval atom, exploding and sending out the smaller atoms that we see today.

WHAT IS THE BIG BANG ?
The universe began by expanding from an infinitesimal volume with extremely high density and temperature. The universe was initially significantly smaller than even a pore on your skin. With the big bang, the fabric of space itself began expanding like the surface of an inflating balloon. The big bang is not like an explosion of matter in space itself began with the big bang and carried matter with it as it expanded. Physicists think that even time began with the big bang. Today, just about every scientist believes in the big bang model.

WHY THE BIG BANG HAPPENED?
Three main observational results over the past century led astronomers to become certain that the universe began with the big bang. First, they found out that the universe is expanding that the separations between galaxies are becoming larger and larger. This led them to deduce that everything used to be extremely close together before some kind of explosion. Second, the big bang perfectly explains the abundance of helium and other nuclei like deuterium in the universe. A hot, dense, and expanding environment at the beginning could produce these nuclei in the abundance we observe today.

QUESTIONS

• 1. If the Big Bang theory is true, how did it lead to all the
• planets, stars , and galaxies we can see today?
• 2. What is the big bang ?
• 3. Why the big bang happened ?
• How did the universe expand ?

THE END