Elements heavier than hydrogen and helium constitute about ________ of the mass of the interstellar medium.
A)0.002%
B)2%
C)70%
D)98%

Name: Elements heavier than hydrogen and helium constitute about ________ of the mass of the interstellar medium. A)0.002% B)2% C)70% D)98%
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Quizplus · Accepted Answer

Elements heavier than hydrogen and helium, often referred to as "metals" in astronomical terms, make up about 2% of the mass of the interstellar medium. The vast majority is hydrogen and helium.

Elements Heavier Than Hydrogen and Helium Constitute About ________ of the Mass