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physical object > natural object > collection of particles > phase of matter > gas > interstellar gas

interstellar gas
subject			fact

interstellar gas	has composition mainly hydrogen
	has density very low
	has definition Sparse, cool gas (mainly hydrogen) in interstellar space. Dust absorbs and scatters radiation; gas does not interact directly with radiation but is coupled to the dust by collisions. Interstellar gas affects only light of certain wavelengths. Temperature 10-100 K.
	is a kind of gas
gas	is a part of disk
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material