1. Stars

2. What is a Star? 1. Hot body of glowing gas
2. Stars are formed when gas and dust are drawn together by gravity and nuclear fusion begins (nebula)

3. Star Size & Temp
3. Range in size from 450x smaller to 1000x larger than the sun
Temperatures range from 3,000ᵒC
to over 50,000ᵒC

4. Star Sizes

5. Star Color b. Cooler stars appear red
4. The color of a star is determined by it’s temperature
a. Hot stars appear blue
b. Cooler stars appear red

6. 5-6. Energy produced by the star is nuclear fusion Hydrogen  Helium
Star Energy
5-6. Energy produced by the star is nuclear fusion
Hydrogen  Helium

7. **The lower the magnitude the brighter the star**
Star Magnitude
7. How bright a star appears on Earth is its apparent magnitude
8. Actual brightness of the star is absolute magnitude
**The lower the magnitude the brighter the star**

8. H-R Diagram

9. H-R Diagrams Explained Video

10. Life Cycle of a Star

11. Life Cycle of a Star

13. Life Cycle of a Star Brain Pop

14. Parallax
the apparent shift or movement of a nearby object against a distant background, when viewed from two different positions
Used to measure distance to nearby stars

15. Parallax Thumb in front of the eyes
Speedometer (not digital) viewed by the driver vs. the passenger
A flagpole when viewed from opposite ends of a sidewalk