Even though helium is twice as dense as hydrogen, this is less than one metric ton of gas.
During the history of our universe, more helium was made because the process that drives the stars turns hydrogen into helium .
Argon is denser than air, and certainly helium , which means that it has more molecules to retain heat.
There he worked with Born on atomic theory, writing a joint paper with him on helium .
Other light elements that are commonly proposed for the outer core are silicon, carbon, helium , and nitrogen.
The atomic elements heavier than hydrogen and helium could not have been produced during the inferno of the Big Bang.
Today, balloons in Japan are lifted by hot air rather than the more expensive helium or hydrogen.
They were the ones who were always crying and throwing fits when they lost their helium balloons.
When most of the hydrogen is fused into helium , fusion stops and and gravity again takes over.
Does it contain yet more unknown chemical elements, like helium ?