Classification+of+Stars

The three main characteristics of a star:
===Size- Scientists classify stars in size because stars are all different sizes, there are many medium stars, like our sun, in the galaxy. Some stars are even big enough that if they were in our solar system they would fill it out all the way to Jupiter. Some stars are even as small as our Earth or as small as 20 kilometers in diameter. === ===Temperature- Stars color reveals it's temperature. The reddish colors in the sky are the coolest and are about 3,200 degrees Celsius. The hottest stars appear blue- white and range to over 10,000 degrees Celsius. === ===Brightness- The brightness of a star depends on its size and temperature. The brightness of a star looks from earth depends on how far away and how bright it actually is. A star's brightness is classified in two ways, its apparent magnitude and absolute magnitude. ===

Different types of Stars: There are 8 different types of stars.
Protostar- T Tauri Star- Main Sequence Star- Red Giant Star- White Dwarf Star- Red Dwarf Star- Neutron Star- Supergiant Star- Citing: Science Explorer 8th grade text book google.com