Abstract

Our galaxy is composed of billions of stars concentrated in the galactic plane, surrounded by interstellar gas, which is mainly composed of hydrogen. About half of the hydrogen is distributed uniformly in the galaxy; the other half is concentrated in interstellar clouds. We find atomic hydrogen in diffuse clouds (with a particle number density n = 10 cm−3); we find molecular hydrogen (H2) in dark clouds (n = 103 cm−3). Finally we have interstellar molecular clouds (n = 106 cm−3) which also contain more complex molecules.

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