1. Star Characteristics

2. A body of hot gases that radiate energy
What is a Star?
A body of hot gases that radiate energy

3. Hertz sprung-Russell Diagram
A graph that shows the relationship between the surface temperature and the absolute magnitude of a star

4. A measure of how much light a star gives off
Absolute Magnitude
A measure of how much light a star gives off

5. A measure of the amount of light received on Earth
Apparent Magnitude
A measure of the amount of light received on Earth

6. A measure of how much energy leaves a star in a period of time
Luminosity
A measure of how much energy leaves a star in a period of time

7. The MORE luminous a star, the BRIGHTER it is.
The luminosity of stars is dependent on:
Temperature
Size
Stars that are the least luminous are: SMALL & COOL
Stars that are the most luminous are: LARGE & HOT

8. Color of the hottest star= BLUE
Color of the coolest star= RED
Most stars are classified as what type of star? MAIN SEQUENCE
Our Sun is classified as what type of star? MAIN SEQUENCE