In the field of astronomy, a common phenomenon of stellar evolution is studies as the sequence of changes that a star experiences during the course of it lifetime. It takes around hundreds of thousands, millions or even billions of years, all through which the star gives out light and heat. And over this period the star undergoes changes and alters its appearance radically.
The Stellar evolution is not really studied by observing the whole life cycle of a only single star; many of the stellar changes are so slight and gradual that it they cannot be detected even over centuries of observation. However, the astrophysicists have now come to understand the way various stars evolve by observing not a single but many different types of stars, each star being at a dissimilar position in its life cycle. With new technological advances scientist are now able to simulating each of the stellar structure using various computer models.
Moreover, Stellar evolution generally starts with a giant molecular cloud (GMC). The GMC is also referred as the stellar nursery. Most of the empty space in the galaxy in fact contains around 0.1 to 1 particle per cm³. However, within the GMC, the standard density is of generally few million particles per cm³. Moreover, a GMC includes 100,000 to 10,000,000 times as much mass as the Sun does with respect to its, which is of 50 to 300 light years across.
Moreover, as this GMC takes it revolutions and thus orbits around the galaxy, any one of various different events might happen that may result in its gravitational collapse. Various GMCs might collide with one another, or they may pass from the path of dense regions of the spiral arms. Moreover, in close proximity a supernova explosion may also be a contributing factor that may trigger, and as a result of that it may bombard the GMC with shocked matter at an extremely high speed............
