The Big Bang
there are VARIETY OF stars in the universe.
types of stars
main sequence stars
Main Sequence stars are located in the center of the universe and where most of the stars in the universe are located and where most most stars spend their lives. About 90% of stars are main sequence stars, these stars and range from a tenth of the size of the sun to 200 times. The Sun, a star located in the main sequence, creates energy from nuclear fusion, which converts hydrogen into helium or makes helium nuclei from protons and it converts mass into energy.
dwarf stars
White Dwarf stars have as much matter as the Sun but are the size of Earth. Most White Dwarf stars are made up of carbon and oxygen. White dwarf stars are said to be stars final evolutionary state. A white dwarf star is formed when a star eventually becomes hot enough for the helium to fuse into carbon and oxygen. Brown dwarf stars, also known as failed stars, are formed like most stars but do not accumulate enough mass to produce nuclear fusion. This is why dwarf stars are known as failed stars.
red giant stars
Red giant stars are formed when main sequence star's mass depletes and the hydrogen fuel or the core begins to collapse. The temperature then increases and energy escapes the core pushing the star outward forming a red giant. This occurs when the hydrogen and helium fusion continues in a shell around the core, but the core starts to contract. After all this the outer layer expands, when when the core collapse. The outer layer then expands and cools creating a red giant.
super-giant stars
Super-giants are stars that are several times more massive than the Sun and can be more massive than even entire solar systems. Super-giants are formed when all of the hydrogen in the core. The core then contracts and the envelope of the star expands making it more luminous and a lot larger. This type of star can fuse elements heavier than hydrogen and helium but to do this super-giants must burn up fuel at a much faster rate than the other types of stars. Eventually all of the fuel used by the star will be burned and the star will go supernova. When a star goes supernova it basically explodes, which is caused by a change in a stars core.
QUESTIONS
1. What types of stars makes up 90% of all stars?
2. What star is made up of carbon and oxygen?
3. What occurs when a star goes supernova?
4. What type of star is the known largest?
5. What star is known as a failed star?