Freeman CrouchUgh. Woke up in the middle of the damn night trying to remember about these astronomical objects I read about maybe a month ago. They're plumes? flumes? ("outflow" was the word) from young stars at a very certain age. Some scrambling with keywords gave me relief, to wit:
They are most simply called HH objects.
https://www.nasa.gov/missions/webb/nasas-webb-snaps-supersonic-outflow-of-young-star/
