The most common element is hydrogen, ... Yet these three elements are the 3rd, 4th, and 5th lightest of all. Here's the cosmic story of why they're so rare.

In the human body, the most common element by weight is oxygen, followed by carbon and hydrogen, according to HyperPhysics. Hydrogen has a number of key roles in the human body.

Oxygen is the 3rd most abundant element in the Universe: about 1% of all the atoms, by mass. NASA, ESA, and W. Keel (University of Alabama, Tuscaloosa), of NGC 5972. 3.) Oxygen.

Most elements in the universe, except for hydrogen and helium (and a few other weird exceptions), were forged by stars, either through nuclear fusion deep within their cores or during gigantic ...

The Sun is mostly hydrogen and helium. Heavier elements like iron and calcium are also in the Sun. These heavier elements came from older stars. “Hydrogen and helium are by far the most abundant ...

Back to Basics. Hydrogen is one of the most common elements in the world — making up 75 percent of all visible matter and more than 90 percent of all the atoms in the universe. At the same time ...