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Essential Question
How do astronomers use the electromagnetic spectrum to study the universe?
Electromagnetic SpectrumThe range of radiant (light) energy
arranged in order of wavelength and frequency
WavelengthThe distance between to crests
of a wave
FrequencyA count of the number of crests that pass a
point in a given amount of timeHigh frequency = high energy
Radio WavesTransmitted by a
radio stationAstronomers use
them to study what stars are made of, their structure and movement
MicrowavesUsed to cook your foodUsed to learn about galaxiesUsed to learn about stars that are behind
clouds of dust
Infrared WavesUsed by astronomers to
map dust between starsThere are 2 types:
○ 1 comes from the heat from the sun
○ 1 is used in any device that has a remote control
Visible LightRainbows 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 RaysNewly formed stars
give off UV raysUsed to learn about
the structure and how galaxies change
Causes you to get sunburned
X-Ray WaveBlack holes give off X-Ray wavesUsed in hospitals and doctors offices
Gamma RaysGiven off from any explosion like a
supernova or a black holeAstronomers 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