Watching the Iwamura presentation reminded me of this, from 2015:
This was big news, for a brief time - as the researchers were baffled by the continual release of oxygen from the comet. e.g.:
After initial bafflement, it has been "explained away" by saying that it must have been buried inside the comet from birth - many billions of years ago.
What no astronomer, cosmologist, or exo-geologist would even consider is whether the oxygen could be generated within the body of the comet itself - through some low energy nuclear process.
Of course this also applies to earth-bound geology - and the cosmological "heavy element problem". Are there any mainstream geologists or cosmologists who hold their hands up and say "Hey guys/gals, maybe all the heavy elements we see around us are actually formed, and reformed, within planets. So perhaps we don't need to spend all that effort trying to calculate whether they all came from supernovae, or the Big Bang."?