The two most common elements in the universe are
The answer is: hydrogen and helium.
The two most common elements in the universe are hydrogen and helium. Hydrogen is the most abundant element in the universe, accounting for about 75% of the total baryon mass. It is an essential component of stars, and is found in the atmospheres of planets such as Earth. Helium is the second most abundant element and is a major component of the Sun's atmosphere. It is also found in the atmospheres of other stars, and is one of the main components of the interstellar medium. Both elements are important for the formation and evolution of stars, galaxies, and planets.
