Re: No H or He?
it's 3.8 billion light years away, meaning it's also 3.8 billion years old
No. Just after the Big Bang, space expanded faster than the speed of light*. So it is younger than 3.8 billion years old.
* Nothing can travel faster than the speed of light in a vacuum - but space didn't "travel" faster than the speed of light, it just expanded faster. A subtle distinction, and the reason why we can only see to the edge of the observable universe, as there as parts that, unless we perfect faster than light travel, we'll never see as the light will never reach us.