Fill in the blank: Elements heavier than hydrogen and helium constitute about of the mass of the interstellar medium.
A)2%
B)0)002%
C)98%
D)70%

Name: Fill in the blank: Elements heavier than hydrogen and helium constitute about of the mass of the interstellar medium. A)2% B)0)002% C)98% D)70%
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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, with hydrogen and helium comprising the vast majority.

Fill in the Blank: Elements Heavier Than Hydrogen and Helium