1.What is a star ?

A star is big ball made up of hot and gas.

2.Types of stars.

The star have  different types . for example super giants .giants .white dwarfs and

Main sequence. color. size.luminosity.temperature.

3.H-R Diagram.

Is a chart that scientists use to classify star by their types size and temperatures

4.Nuclear fusion

Is the process in which the two hydrogen molecules combine and transform into one helium molecule, and thus the energy is made.



5.The life cycle of a star.      
   Huge Stars and Giant Stars are also created in Stellar Nebula, then they become Super Giants, then both of them explode into a big cloud called Supernova, than Huge Stars become Neutron Stars and Giant Stars become Black Hole.