Hydrogen and helium.
The two most common elements in the Universe, and in most stars are - in that order - hydrogen and helium (elements #1 and #2).
Hydrogen and Helium are the two most common elements in the universe.
Hydrogen, followed by helium.
Mainly hydrogen and helium. The reason for this is simply that these are the most common elements in the Universe.
Ionized hydrogen and helium are the most abundant chemical elements in nebulae.
Hydrogen and Helium. :)
Oxygen and silicon are the two most abundant elements found in the most common minerals. The most common minerals found on Earth are silicates.
Hydrogen and helium.
Hydrogen and helium are the two most abundant elements in the universe.
The two most common elements found in nebulas are hydrogen and helium. These elements are the building blocks of stars and galaxies, and are formed during the process of stellar nucleosynthesis.
Most of the universe is made up of hydrogen gas, followed by helium. These two gases are the most abundant elements in the universe and can be found in stars, galaxies, and interstellar space.
Water in some form has been discovered on most if not all the solar planets. This is not terribly surprising, since water is composed of the two most common reactive elements in the universe. (Helium is more common than oxygen, but it is not reactive.)