What fraction of the measured mass of the universe is hydrogen (as represented by "standard cosmic abundances" in the interstellar medium)?
A) 25%
B) 98%
C) 1%
D) 74%

Question

Quizplus · Accepted Answer

Hydrogen is the most abundant element in the universe, making up about 74% of the universe's baryonic (normal) mass. This is because hydrogen was the first element to form after the Big Bang and serves as the primary building block for other elements through the process of nuclear fusion in stars.

What Fraction of the Measured Mass of the Universe Is