The World's Birthday

Dating creation is the time passed since the moment when the Universe appeared. In fact it is the category that uses a number of methods to get to know the age of the world. There are a lot of scientific, religious ad mythological conceptions about the age of the Universe and its chronology.
It is considered that out universe appeared about 13.73 ± 0.12 milliard years ago. This is the modern opinion adapted on base of one of the most spread models of the Universe.
It is possible to get to know the age of the world using three methods:
- The age of elements – the age of chemical elements can be defined using the phenomenon of radioactive decay with the aim to get to know the age of certain elements of the mixture.
- The age of galaxies accumulations. The age of the most ancient star-clusters can be defines using the power of their radiation and the temperature of some of them. With the help of this method it was defined that the age of our universe is more than 12.07 milliard years with 95% probability that it is true.
- The age of stars. The age of the most ancient stars can be defined considering their light emission and their brightness. It is also possible to get know the time that is needed for this star to cool down. In such was the next age was got - 9.5+1.1-0.8 milliards years for the stars of the Via Lacteal disk. But Universe is at least 2 milliards years older than this disk that means it is 11.5 milliards years older.