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PCS 181 Midterm: Astronomy_test2_Notes.doc

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redsea-lion372
1 Apr 2012
School
Ryerson University
Department
Physics
Course
PCS 181
Professor
Margaret Buckby

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Document Summary

This is gas and dust that occupy space between the stars. Stars form out of the gas/dust in space. When a star is born there is a high wind that blows off particles and then the star can then appear. Dust is approx 1% of the total visible mass is space. Obscures our view of distant objects in the galaxy. Silicate particles (comes right under carbon in periodic table therefore it has the same chemical properties as carbon) Light from a star passes through the dust cloud. The dust particles are approx the same length as blue wavelengths. The dust scatters blue wavelengths more than red wavelengths. Red wavelengths go right through the dust particles but the blue wavelengths have trouble, and is therefore scattered. A larger number of red photons pass unhindered through the dust and reach the observer. Star appears redder than it actually is.

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Physics: Principles with Applications
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ISBN: 9780321625922

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