Frozen volatiles including h2o ice are much more reflective to S-band radio waves than lunar rocks. Radio waves also have unique traits when mirrored off ice than off silicate rock. An Investigation with the alerts returned from orbit 234 confirmed reflection traits suggestive of h2o ice for that forever shadowed https://icecaps64185.verybigblog.com/28174350/ice-caps-moonrock-for-dummies