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The Interstellar Medium
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Question We have heard the term “vacuum of space”, what does this mean? Is it really empty?
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Interstellar Medium Gas and dust between stars
Place where stars are born and the stuff of dead stars Found within galaxies and just outside
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Orion A great place to observe interstellar medium
Look carefully at Orion’s sword, you will see one of the stars has a hazy cloud
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Nebulae: clouds of gas and dust
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Interstellar dust Dust in space Constantly spreading through space
Makes up 1% of the interstellar medium Causes two different phenomena Interstellar extinction Interstellar reddening
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Interstellar extinction
Distant stars look fainter because of interstellar dust in the way The star becomes about 2 magnitudes fainter per thousand parsecs the star is away from the sun Ex pc= 2 mag fainter 2000 pc = 4 mag fainter
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Interstellar reddening
Dust particles scatter light making a blue star look reddish
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