Ortho-to-para ratio
It's a bit like finding a specific type of cookie in a batch – you wouldn't have guessed it was there! The astronomers at the JWST were surprised to find that Comet 81P/Wild 2 has more ortho-water (a type of water molecule) than para-water, with about 2.76 parts ortho to every one part para.
Technical definition
The ratio of ortho-water (with a particular molecular spin configuration) to para-water in a water-rich environment or sample.