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Atomic gas. Molecular clouds. Atomic and molecular gas in the galaxy M33 (Engargiola et al. 2003). M51 in CO emission (left) and optical (right) (Koda et al., 2009). Pipe Nebula (Lombardi, Alves, & Lada 2006) -- optical. Pipe Nebula (Lombardi, Alves, & Lada 2006) -- extinction.
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Atomic gas Molecular clouds Atomic and molecular gas in the galaxy M33 (Engargiola et al. 2003)
M51 in CO emission (left) and optical (right) (Koda et al., 2009)
Pipe Nebula (Lombardi, Alves, & Lada 2006) -- optical Pipe Nebula (Lombardi, Alves, & Lada 2006) -- extinction
The Perseus molecular cloud in 13CO J=2-1, integrated over velocity (Sun et al. 2006)
Evolutionary tracks in the HR diagram for stars from 0.6 - 6 M. Only lower mass stars have a Hayashi track.