Stellar Mechanics

Stars are just like the other living beings in the earth, as they will have a birth, living period and of course the death. Stellar Mechanics is a subject, which deals with the lifecycle of stars. The major areas focused in this topic are like the evolution and birth of stars. In addition, you can also get to know about why there will be pulsation occurring in some stars regularly.

According to the modern astronomy, this universe is said to be originated approximately 14 billion years in the past. Well, as we know, Big Bang is said to be the reason behind the origination of the universe. During this giant process, it has been assumed that the entire Universe was very dense, very hot and very small. Later it started expanding and as a result, it was cooled and there was a fireball formed out of which congealed some helium and hydrogen atoms. This primordial matter is what responsible for the formation of stars, and group of stars, which is called galaxy. However, the galaxies, which we find out there in space, are in a continuous process of expansion. 

There are some nuclear fusion processes undergoing in the cores of these stars. This is what leads to the creation of some heavier elements like oxygen and carbon, which in turn will create ‘metal’. The stars having a short life span is said to be the Big Stars, as they will explode after a short period of time compared to mid-sized or small stars. The great thing about these Big Stars is that once they explode, the constituents of the exploded star will give rise to some new stars. Some other exploded heavier elements is said to create some biological organisms and rocky planets. The Milky Way Galaxy is having a structure like a pinwheel.

Questions:

• What is Big Bang?
• What is the structure of the Milky Way Galaxy?