More Hydrogen

Hydrogen is the most abundant element in the universe — it accounts for more than 90 percent of all the normal matter. It also accounts for more than 90 percent of the matter that makes up the Sun and most other stars.
Here on Earth, though, it’s seldom found in its pure form. Instead, it’s combined with other elements to make water and other compounds. As a result, it wasn’t “discovered” until 250 years ago.
All that hydrogen was forged in the Big Bang. As the universe expanded and cooled, energy was converted to matter — the first subatomic particles. These then merged to form protons — the nuclei of hydrogen atoms. Some of those nuclei linked up to form helium, so the early universe consisted almost entirely of hydrogen and helium.
Over time, clouds of these gases collapsed to form stars. Nuclear reactions in the hearts of the stars forged more elements. And stellar explosions forged even more. So stars that formed later, such as the Sun, incorporated a smidgen of these newly formed