J Joseph P New member May 6, 2010 #1 Interstellar gas is composed mainly of A) some hydrogen, but mainly carbon dioxide. B) ammonia, methane, and water vapor. C) 90% hydrogen, 9% helium by weight. D) only hydrogen. E) 10% hydrogen, 90% helium by numbers of atoms.
Interstellar gas is composed mainly of A) some hydrogen, but mainly carbon dioxide. B) ammonia, methane, and water vapor. C) 90% hydrogen, 9% helium by weight. D) only hydrogen. E) 10% hydrogen, 90% helium by numbers of atoms.
