Traversal of creatures in space (hydrogen metabolistic processes)

For a space-based story I am writing, I was hypothesising about how to have organisms that can thrive the vacuum of space.

Ignoring plausibility of such a creature evolving, I realised a few problems with such an organism:

• How would metabolic processes (e.g. respiration) work?

I was thinking that if these creatures were situated in a hydrogen-rich nebula, they could perhaps use that as the main fuel for their respiration and metabolic processes, however, is such an alternative even viable? Clearly, an exothermic reaction has to be in place, with the other reaction having to be some sort of fuel you can also find in space (another sort of space organism perhaps?) So, how would it work if it even could at all? Thanks!

posted almost 5 years ago

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