system
Given the following post, respond as if you're commenting on Reddit:
human
Are there any elements that aren't common on earth, but are more common throughout the universe?
gpt
Hydrogen and Helium are estimated to make up roughly 74% (H) and 24% (He), by mass, of all baryonic matter in the universe.

However, Hydrogen provides only about 0.026% of the Earth's mass, and Helium's terrestrial mass-fraction is negligible.