1. Essential Question  How do astronomers use the electromagnetic spectrum to study the universe?

2.  Electromagnetic Spectrum The range of radiant (light) energy arranged in order of wavelength and frequency

3.  Wavelength The distance between to crests of a wave

4.  Frequency A count of the number of crests that pass a point in a given amount of time High frequency = high energy

5. Radio Waves Transmitted by a radio station Astronomers use them to study what stars are made of, their structure and movement

6.  Microwaves Used to cook your food Used to learn about galaxies Used to learn about stars that are behind clouds of dust

7.  Infrared Waves Used by astronomers to map dust between stars There are 2 types: ○ 1 comes from the heat from the sun ○ 1 is used in any device that has a remote control

8.  Visible Light Rainbows show the different wavelengths of light We are able to see colors of stars which gives us a clue about their temperature Helps us understand the Red Shift and Blue Shift

9.  Ultraviolet Rays Newly formed stars give off UV rays Used to learn about the structure and how galaxies change Causes you to get sunburned

10.  X-Ray Wave Black holes give off X-Ray waves Used in hospitals and doctors offices

11.  Gamma Rays Given off from any explosion like a supernova or a black hole Astronomers use them to gain knowledge of how our universe began and how fast it is expanding

12. Radio Waves: The Sun

13. X-Ray: Andromeda Galaxy

14. Infrared: Constellation Orion