Astr 222 Jan 24 2005: The Milky Way, specially its ISM  

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Space distribution of disk and halo

Gas Clouds in Between Stars

Hydrogen in Molecular form

Question: what part of the spectrum is this emitted in?

Using CO to trace molecular hydrogen

Question: What physical processes cause ionized hydrogen to glow?

ISM in our Galaxy

Distribution of HI and molecular gas

Multiwavelength Milky Way

Measuring heavy element content

de Vaucouleurs Milky Way