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Astronomy Day 5. Goals Explain the connection between temperature and color. Draw three basic types of galaxies. Identify the galaxy that we live in. Bell Ringer. Why is snow white? It’s made of water and water is colorless, so how come it turns white just by freezing?.

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Astronomy Day 5

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Astronomy Day 5

Goals

Explain the connection between temperature and color.

Draw three basic types of galaxies.

Identify the galaxy that we live in.


Bell Ringer

Why is snow white?

It’s made of water and water is colorless, so how come it turns white just by freezing?


Paul Hewitt Video Clip

Be prepared to discuss the video clip.


Work with your shoulder partner to draw black body curves for the following stars

Yellow

Blue-white

White

Blue

Orange

red

Label the x-axis as wavelength and the y-axis as Luminosity in Suns.

The lines you draw should correspond with the color of the star.

Make a key that shows the names of the stars.

Record the temperature (K) at the peak of your line.

Drawing Blackbody Curves


Temperature and EM radiation

  • Hotter objects emit different EM radiation than cooler objects

  • Hotter objects will emit shorter wavelength EM and cooler objects

  • Think about what you know about wavelength of EM and its energy—why does this make sense?


Black Body Curves


The temperature of a star is evidenced by its

  • Color

  • Brightness

  • Angular momentum

  • Rate of burning

  • Distance


The brightest color emitted by the sun is

  • Blue-green

  • Orange

  • Red

  • Yellow-green

  • Violet


Applications of the connection between temperature and EM radiation

  • Infrared ear thermometers

  • Infrared thermometers


Galaxies

There are 3 basic types of galaxies

Spiral

Elliptical

Irregular

These three types were identified by Edwin Hubble


Milky Way


The Milky Way is

  • An irregular galaxy

  • An elliptical galaxy

  • A spiral galaxy


Ticket Out

  • Explain the connection between temperature and color.

  • Draw 3 basic types of galaxies. Circle the type we live in (the Milky Way Galaxy)


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