1. Star Evolution

2. Order them youngest to oldestC B A D E F

3. Order them youngest to oldestA B D C E G H F

4. Answer: D, F, H, C, A, G, E, & B A B D C E G H F

5. Life cycle of a star Stars age as they run out of hydrogen fuel.
Large stars go through 5 main stages.

6. Stage 1
All stars are “born” or begin in a large cloud of gas and dust called a nebula.

7. Stage 2
A star will spend most of its life at this stage, main sequence. Hydrogen (H) undergoes nuclear fusion in the core.

8. Stage 3
When the H starts to run out, the star will expand and cool down forming a red giant.

9. Red Super Giant Star in Orion Constellation

10. Stage 4
Eventually, expanding will stop and the red supergiant will collapse violently, causing a bright supernova to appear.

11. Stage 5 (large star)
As the core collapses, the gravity in the center is so strong, nothing can escape.
Even light is trapped, producing a black hole.

12. Stage 5 (small star)
Small stars (like our sun) will collapse into a small, Earth sized star giving off dim light as a white dwarf.

13. Order them youngest to oldestC B A D E F

14. Answer: A, F, D, C, then E or B C B A D E F

18. Which stages are missing? Why?

19. Star Evolution