1. 1. _____ huge, hot brilliant ball of gases 2. _____inner atmosphere of the sun 3. _____loops of gas that jump from sunspots 4. _____ how hot or cold something is 5. _____how the composition of a star is identified Do Now

2. 1. How is a star born? 1. How is a star born? 2. When is a star in the main sequence stage? 2. When is a star in the main sequence stage? 3. What are blue stars? 3. What are blue stars? 4. What is a red dwarf? 4. What is a red dwarf? 5. When does a star get old? 5. When does a star get old? 6. How does a star die? 6. How does a star die?

3. How is a star born? 1. A star is born from a collapsing nebula from heat and pressure

4. When is a star in the main sequence stage? 2. A star is in the main sequence stage when nuclear fusion begins. 2. A star is in the main sequence stage when nuclear fusion begins. Longest and most stable part of a star’s life Longest and most stable part of a star’s life

5. What are blue stars? 3. Blue Stars 3. Blue Stars Very massive Very massive Quickly uses hydrogen Quickly uses hydrogen Expands and turns into a giant or supergiant Expands and turns into a giant or supergiant

6. What is a Red Dwarf? 4. Red Dwarf 4. Red Dwarf Low mass, cool, dim Low mass, cool, dim Some of the oldest stars Some of the oldest stars

7. When does a star get old? When does a star get old? 5. A star gets old when 5. A star gets old when Runs out of hydrogen. Runs out of hydrogen. Center shrinks Center shrinks Grows large and cools Grows large and cools Very massive become red giants or supergiants Very massive become red giants or supergiants

8. How does a star die? 6. A star dies when 6. A star dies when Fusion stops Fusion stops Core glows Core glows becomes a white dwarf which is small and hot becomes a white dwarf which is small and hot Outer layers drift away from core Outer layers drift away from core When white dwarf stops glowing it becomes a brown dwarf When white dwarf stops glowing it becomes a brown dwarf