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Hydrogen
Interstellar gas is made of mainly hydrogen. This is because that is the building for everything and hydrogen is the most common element in the universe.
Ulrich Mebold has written: 'The spin temperature of the interstellar neutral hydrogen from 21-cm line spectra' -- subject(s): Interstellar hydrogen, Nuclear spin
The sun is about 98 percent hydrogen.
Visible light against electrons combined with ionized hydrogen create the "reddening" effect in the Interstellar Medium.
Vast interstellar clouds of hydrogen are known as "nebula."
The two gases that are most common in interstellar clouds,consist mostly of gas,especially hydrogen and helium.
carbon monoxide
Cold atomic hydrogen
E. Bajaja has written: 'Observations in the 21-cm neutral hydrogen line..' -- subject(s): Interstellar hydrogen
i don't know the percentages but i do know that hydrogen and helium are the 2 main gases! sorry this did not completely answer the question:(
Hugo is an asteroid, whilst a nebula is an interstellar cloud of dust, hydrogen gas and plasma