The science of stars (my little project) What I want to do today is talk to you about the Big Bang theory. Let me begin by looking at some key facts. The Big Bang theory is cosmological model that describes the early development of the Universe. According to the theory, the Big Bang occurred 13,7 ± 0,13 billion years ago, which is thus considered the age of the universe. What it means is that was formed huge cloud. Then the temperature dropped and different substances have come together to create stars and galaxies. It is incredibly long process. Did you know that our age of sun is more than 4,57 billion years? It’s half of average life of usual star. And Age of our Earth is 4,54 billon years. Now let me turn to say you, if you have good vision, you can see more than 3000 stars in the night sky in one hemisphere. As I said earlier the Big Bang theory is only theory. One of the main law of physics is : “You can’t get something from nothing”. So let me finish by saying that it’s a mystery, that we won’t know for sure.