By mass,the interstellar medium in our region of the Milky Way consists of
A) 70% Hydrogen,30% Helium.
B) 70% Hydrogen,28% Helium,2% heavier elements.
C) 70% Hydrogen,20% Helium,10% heavier elements.
D) 50% Hydrogen,50% Helium.
E) 50% Hydrogen,30% Helium,20% heavier elements.
Correct Answer:
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