SCI 102 Lecture 9: PCS181 Notes Class 9
13 Apr 2016
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Light from a star passes through the dust. The dust particles are ~ same length as blue "s. The dust scatter blue l "s more than red "s. More red photons pass unhindered through the dust and reach the observer. Interstellar matter: dust and gas that occupy space between the stars, stars form in the dust/gas clouds in space. Dust: dust is ~ 1% of the total visible mass in space, obscures our view of distant objects, is a mixture of: elongated, tiny grains of dirty ice grains of graphite (carbon) silicate particles complex molecules. Gas: ~ 100 times more gas than dust mass in the universe, gas/dust ~ 100, visible universe contains:
