What fraction of the universe's baryonic mass is composed of hydrogen?
Answer
Roughly three-quarters
Hydrogen makes up roughly three-quarters of all the baryonic mass in the universe.
Frequently Asked Questions
What fraction of the universe's baryonic mass is composed of hydrogen?What is the process occurring in stars that converts hydrogen into helium and releases energy?If every hydrogen atom instantly vanished for a few seconds, what is the immediate consequence for a star's energy output?What crucial generation of celestial objects cannot be formed if hydrogen is permanently absent from the cosmos?How does the timescale of universe failure due to instant hydrogen loss compare to the predicted Heat Death scenario?If hydrogen vanished during the active hydrogen-burning phase of stars, at what point would nucleosynthesis halt?What immediate chemical consequence exists for advanced civilization if hydrogen disappears?What vital molecule, crucial for biochemistry on Earth, requires hydrogen?What prevents existing massive stars from indefinitely burning helium or heavier elements after hydrogen is exhausted?In a universe permanently devoid of hydrogen, what would the final state of matter resemble?