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Essential Question How do astronomers use the electromagnetic spectrum to study the universe?
Electromagnetic Spectrum The range of radiant (light) energy arranged in order of wavelength and frequency
Wavelength The distance between to crests of a wave
Frequency A count of the number of crests that pass a point in a given amount of time High frequency = high energy
Radio Waves Transmitted by a radio station Astronomers use them to study what stars are made of, their structure and movement
Microwaves Used to cook your food Used to learn about galaxies Used to learn about stars that are behind clouds of dust
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
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
Ultraviolet Rays Newly formed stars give off UV rays Used to learn about the structure and how galaxies change Causes you to get sunburned
X-Ray Wave Black holes give off X-Ray waves Used in hospitals and doctors offices
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
Radio Waves: The Sun
X-Ray: Andromeda Galaxy
Infrared: Constellation Orion
The energy that comes from the sun is called electromagnetic radiation. This energy is carried by several waves with different wavelengths and frequencies.
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