On Earth, much of the wrenching discomfort of emesis, apart from the sensation of nausea itself, is from the coordination of many muscles it takes to counter gravity.
It's vital as we postulate and work toward exploration and human settlement beyond Earth. I like to think of the possibilities of sustaining humanity's continuum, with preserved recorded history way beyond the life of our Sun.
Some animals on Earth regurgitate as opposed to vomit, i.e., stomach contents flow up into the esophagus without any forceful abdominal contractions. What I experienced in zero gravity was similar to this, expulsion without the heaves.
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