All of the hydrogen was created at the initial cooling of the big bang. In this case what I mean by primordial, is that it was never part of a larger composite object like a star.
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Cake day: June 13th, 2023
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If that hydrogen was previously incorporated in a star, I think it’s fair to call it stardust. That’s very likely, since our solar system would have formed from a relatively dense cloud of the remnants of earlier stars, with just a smidge of primordial hydrogen mixed in.
Many here will be seeing this for the first time. For others it will be a fun reminder of something they haven’t seen for a long time. Still others will find it to be the same old tired shit they’re sick of.
When you see the same old tired shit on Lemmy (or any social media), just move on. There will be plenty that is new to you.
Which two event are you talking about being simultaneous? The Sun going out and Earthers observing it? Those things will not be simultaneous in any reference frame, because they are “light-like” separated. (ie they lie on a 45 degree line in a Minkowski plot.)
Hah!
But really, anyone who continues along the same line of research for long enough is going to necessarily cite themselves rather than just listing all of the previous results in each paper.