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Hydrogen and helium freeze or liquefy at only a few degrees above absolute zero, and thus they do not get incorporated..., but all stars forming today start off their lives made of 73 percent hydrogen, 25 percent helium and 2 percent heavier elements.

Not necessarily. Hydrogen is 'destroyed by being fused into helium..., so it is possible that the expansion may prevent the last few hydrogen nuclei getting together.

Hydrogen is the lightest element as well as the most abundant. In the inner...isn't locked into a compound like water the heat would tend to cause any free hydrogen to escape the terrestrial planets' gravity and disperse into space. The...

...isn't technically burning. It started off as a huge cloud of hydrogen. Once this cloud got big enough, it's own self-generated...

Stars are humongous. Even when they run out of hydrogen in the core there is still plenty more in the outer layers that ...

The hydrogen is just the left overs. Only a small percentage of the hydrogen... will never actually be replaced. Eventually, most of the hydrogen in the universe will be gone, and all nuclear fusion will stop leaving the...

Hydrogen and helium are by far the most abundant elements in stars, but...primordial universe. That's because lithium nuclei readily break up into hydrogen and helium nuclei inside a star. One way dim red dwarfs ...

... is called ice, which has two atoms of hydrogen and 1 atom of oxygen per molecule. Mars has plenty of ice. Some...