1. Chapter 15 Stars, Galaxies, & the Universe

2. Vocabulary to Know Black hole Nuclear fusion Parallax Pulsar Quasar Supernova Spectrum

3. Key Concepts Color of a star & temperature – Red stars are the ____________ – Blue stars are the ___________

4. A spectroscope give astronomers info about a stars ______________ & _____________ Key Concepts What do the black lines indicate?

5. Absolute Magnitude vs Apparent Magnitude – Apparent magnitude is bright a star as viewed from Earth – Absolute magnitude is seeing how bright each star would be if all stars were 32.6 light years away from Earth. Key Concepts

7. Key Concepts – Life Cycle of a Star

8. Key Concepts: HR Diagram Hint: TEST QUESTION

9. Time …. Approximately 14 billion years ago All matter was compressed Pressure caused an explosion Extreme heat to cooling within seconds Cosmic radiation – Noise left over from Big Bang Key Concepts – Big Bang Theory