In his X post, Dominick - who has since left the ISS and returned to Earth on Friday - said: 'This one goes out to all the ketchup lovers out there. Everyone I've shared it with either thinks it is awesome or gross. Nothing in between.'
Because of this microgravity environment, the ketchup isn't pulled downwards as it's squeezed out of the bottle - resulting in a satisfyingly-straight line. Dominick added that he was 'having fun' with his crewmates before he made the return journey back to Earth on Wednesday evening.
Their SpaceX craft finally splashed down in the Gulf of Mexico just off the Florida at 3:29am EDT (08:29am BST) on Friday, after their homecoming was stalled by problems with Boeing's new Starliner astronaut capsule.
One X user replied in agreement: 'It's a little awesome a little Gross.' Another said: 'THIS is the kind of science we need to be doing up there!'
Dominick said about the ketchup video: 'Also some interesting science stuff happening.' This highlights the unique behaviors of liquids in microgravity.
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