'This element that makes up about 25% of the sun's mass was first discovered on the sun in 1868'
helium
IT'S ELEMENTARY: This element that makes up about 25% of the suns mass was first discovered on the sun in 1868
This element that makes up about 25% of the sun's mass was first discovered on the sun in 1868
This element that makes up about 25% of the sun's mass was first discovered on the sun in 1868
IT'S ELEMENTARY
helium
IT'S ELEMENTARY