The Stars

1.. What is a star?
    Stars are big balls of hot gases. Stars are made of dust and gas in a giant cloud called Stellar nebula. Some of the Stars are bigger and some of them are smaller. The bigger are more bigger then and also more brighter then our sun but Stars look smaller to us just because they are to far away from us. Stars are found in different color and size. The Stars can be in blue,white orang,red and yellow color and Stars also have different temperature and luminosity brighter are hot and dims are cold. The spectral class is bassed on Stars temperature and color. The blue Stars are hot and the red Stars are cold.

2.. Type of stars
     There are four (4) type of Star.

• Super giants are huge, hot and bright Stars.
• Giants are kind of bright and cold Stars.
• White dwarfs are old and smalls Stars these Stars are also kind of hot and dim.
•  Main sequence Stars can have different color, temperature, size, and different luminosity. Because their spectral class changes. Main sequence stars are middle ages star so they medium 

    Stars are also classified by their color temperature, luminosity, size, and their ages.

3.. H-R Diagram

     H-R Diagram basically stand for Hertzsprung-Russell Diagram. Astronomer used H-R Diagram to classified Stars according to their characteristic (color, size, temperature, luminosity).

  

4.. Nuclear Fusion

     The Stars can get smaller because of gravity (cloud shrink) as they shrink the Stars become hotter much as possible then the nuclear reaction start in the middle of it then a star born. Nuclear Fusion change Hydrogen (H) in to Helium (He) inside of the star. That's how star make energy.

5.. The life cycle of a Star

     All Stars has their own different life but all cycle Star were created in huge cloud called Stellar nebula.

There are like three (3) types of stars.

• Sun like stars it Start in Stellar Nebula after this it become Red Giants. Then it explode in huge cloud called Planetary Nebula. Then it become White Dwarf after star turn dim and begin cold it become Black Dwarf.
• Huge Stars and Giant Stars are also created in Stellar nebula. Then it become Super Giants after that both of these explode into a big cloud Supernova.
• The Huge Stars become Neutron Stars.
• Giants Stars become Black Hole.