The Birth and Death of Stars
All the theories of the existance of the Universe agree that stars (suns)follow a predicted life-cycle. The path that each follows is ultimately determined by the amount of matter that is gathered at the time of the 'star birth'.
Stars are divided into 3 major categories. They are categorised into these groups according to their size. Massive Stars (Giants), Medium Stars and Small Stars.
It is in the huge clouds of Hydrogen called the, Sloar Nebulae (star nurseries) that, after an 'event' such as a super nova, or something that creates a movement of energy or movement out in the cosmos, then matter starts to move. Once the 'disterbance' resonates through this cloud particels star to gather (millions and millions of years). The matter eventually gathers and starts to compress into huge discs. Pressure and heat eventually cause the atoms to fuse (protostar) Once this takes place the atsr is born and starts emitting light and heat. The size then remains constant due to the balanced forced.
Stars are divided into 3 major categories. They are categorised into these groups according to their size. Massive Stars (Giants), Medium Stars and Small Stars.
It is in the huge clouds of Hydrogen called the, Sloar Nebulae (star nurseries) that, after an 'event' such as a super nova, or something that creates a movement of energy or movement out in the cosmos, then matter starts to move. Once the 'disterbance' resonates through this cloud particels star to gather (millions and millions of years). The matter eventually gathers and starts to compress into huge discs. Pressure and heat eventually cause the atoms to fuse (protostar) Once this takes place the atsr is born and starts emitting light and heat. The size then remains constant due to the balanced forced.
Massive Stars, also known as Giants, have s shorter life span because they burn very quickly. A Giant star is approxiomatly 3-5 times the size of our sun. Gravity is constantly acting upon objects, even stars. While a star is burning, there is a continuous tug of war between gravity pushing in and pressure pushing out. Nuclear reaction in the core of the star generate enough energy and pressure to push outwards. For majority of the stars life, gravity and pressure are balanced, so the star is stable. Nevertheless, when starts reach that crusial part of their life when the atr runs out of nuclear fuel, gravity will take over and the material in the core is compressed. The bigger the star the greater force of gravity that compresses the material. The star will soon collapse under its own weight. This reaction will form a Super Giant red. A Super Red Giant is a extremeley large star, with a minimum of 15 solar masses, 10, 000 times the size of our sun. When the Super Red Giant collapses it will cause a Super Nova. A Super Nova is the death of the star, it unleashes burst of light through cosmos. This will finally lead to the death of the star. After the Super Nova, the dead star will turn into a black hole.
The second type of star, is the Medium Star. It has an average life span of 10 billion years. Identical to the Giant Star, there is a continuous tug of war between gravity pushing in and pressure pushing out. Nuclear reaction in the core of the star generate enough energy and pressure to push outwards. For majority of the stars life, gravity and pressure are balanced. Nevertheless, when starts reach that crusial part of their life when the atr runs out of nuclear fuel, gravity will take over and the material in the core is compressed. The bigger the star the greater force of gravity that compresses the material. The star will soon collapse under its own weight. However the difference is, this reaction will form a Red Giant. A red giant star is a dying star in the last stages of stellar evolution. Finally it will transform into a Neutron Star. The core of the Red Giant collapses and crushed together every proton with corresponding electron truning each proton pair into a neutron. The neutrons, howver can often stop the collapse and remain as a neutron star.
The third and final type of Star, is Small Stars. They are predicted to have a much longer life span, as they have to generate and use less fuel due to its size. After the procdure of the Nuclear reaction, and gravity taking over, unlike the others, the small star will transform into a Red. A Red is a much smaller version of The Super Red and the Red Giant, this is determined by the matter and gravitation pull. The Red, after many billioms of years will turn into a Brown Dwarf or Black Dwraf. They will eventually fade away into darkness.
To the right, is a H-R diagram is a scatter graph of stars, showing the relationship between the stars' absolute magnitudes or luminosities versus their spectral types or classifications and effective temperatures.