Will the Universe ever run out of hydrogen?

In m51 and other diffuse nebulas where star formation has been observed where does the hydrogen come from to start the fission process over again since the star that just blew up already turned its lighter elements into heavier ones

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  • 9 years ago
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    >Will the Universe ever run out of hydrogen

    One day yes. Eventually the universe will be diffuse matter and most likely even hydrogen atoms will decay. But not for a few trillion years or so.

    As for the rest of your question, often a star does not fuse all of it's hydrogen. Only in the core is there enough pressure to fuse hydrogen. Thus the outer edges (which are comprised of mostly hydrogen) do not get fused. Even after a star ends it's life cycle and fuses and much as it can, it will still be made up of mostly hydrogen. There just won't be any in the core where matter is capable of fusing. Then when the star blows up, that hydrogen that is blown off can go into making a new star. On another note, there is still plenty of hydrogen all over the galaxy which has never been inside a star yet. The dust all throughout the plane of our galaxy is testament to that.

    Source(s): Astrophysics Degree
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  • 9 years ago

    According to our current understanding of the universe the answer is YES. However it does violate the law that states energy cannot be created nor destroyed, it can only take another form.

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