'About half the amount of this gas in the sun's core has been fused into helium'
Hydrogen
THE SUN: About half the amount of this gas in the suns core has been fused into helium
About half the amount of this gas in the sun's core has been fused into helium
About half the amount of this gas in the sun's core has been fused into helium
THE SUN
Hydrogen
THE SUN