1. The Doppler Effect Solar System Day 3

2. Solar System Day 3- Objectives Describe how the _____________________ can be used to study the movement of objects in the universe

3. Key Points The ________________________is the change in wavelength that occurs when an object moves toward or away from a source The Doppler effect can be used to determine a star’s ___________________toward or away from Earth – As an object moves toward you, the wavelength _____________________ – As an object moves away from you, the wavelength ______________________ – Large Doppler shifts indicate ___________________________________

4. The Study of Light Most of the information about the universe beyond Earth comes from analyzing the light that comes from very distant sources. Visible light is only a very small fraction of all the energy that makes up the ______________________________________ – Gamma rays, x-rays, microwaves, ultraviolet, microwaves, radio waves – The EM spectrum is arranged by _______________

5. Electromagnetic Spectrum While watching- answer the following- where do stars emit almost all of their light in the spectrum?

6. The Doppler Effect THINK about what an ambulance siren sounds like. That characteristic sound is produced by the Doppler effect The Doppler effect is the _________________ ____________ that occurs when an object moves ______________________ from a source

7. The Doppler Effect In astronomy, we can use the Doppler effect to determine whether a star is _______________ from or toward the Earth As an object moves toward you, the wavelength gets ______________ (for sound waves this means there is a higher pitch) – Shift toward higher energy waves As an object moves away from you, the wavelength gets ____________ (for sound waves this means there is a lower pitch) – Shift toward lower energy waves

9. The Doppler Effect Changes in wavelength due to the movement of an object toward or away from something are called ________________________ ___________________ Doppler shifts mean that an object is moving ________________ Doppler effect video While watching- what evidence from the Doppler Effect is there that the universe is expanding?

10. Check Ins 1.What types of radiation make up the electromagnetic spectrum? 2. How can astronomers determine whether a star is moving toward or away from Earth? 3. List the colors of visible light from longest wavelength to shortest wavelength. 4.What term refers to the change in wavelength that occurs when an object moves toward or away from a source? 5.What does a large doppler shift indicate? 6.What will happen to an object’s wavelength as the object moves toward you?