1. I can define luminosity
I can read the H-R Diagram
I can explain how the sun creates energy

2. A HOT, LUMINOUS gaseous body
What is a STAR?
A HOT, LUMINOUS gaseous body
So ... what is luminosity?
Amount of LIGHT the star shines into space each second

3. I can define luminosity
I can read the H-R Diagram
I can explain how the sun creates energy

4. Changes due to distance from Earth & because they emit more light
HOW do Stars DIFFER?
1) Size, Temperature and Age!
2) Apparent BRIGHTNESS
Depending on how close they are to Earth
Changes due to distance from Earth & because they emit more light
Game
RED SUPERGIANT
WHITE DWARF

5. Colors & Temperatures of Stars

9. The Life Cycle of a Star

12. PG. 15 ESRT

13. READING HR DIAGRAM 1. Luminosity compared to sun which is = ONE
2. Roughly 90% of all stars fall on a diagonal line across the diagram called the MAIN SEQUENCE
3. Temperatures DECREASE as you move to the RIGHT
BLUE = HOT RED = COOL
4. Mass of stars is directly related to luminosity
(MASS INCREASES then LUMINOSITY INCREASES)

14. I can define luminosity
I can read the H-R Diagram
I can explain how the sun creates energy

15. The Sun The Sun is a mass of hydrogen and helium gas
The incredible gravity causes nuclear fusion, which creates all the Suns energy.
Source of Earth’s energy.

17. I can define luminosity
I can read the H-R Diagram
I can explain how the sun creates energy