The difference between Arupaloka and Nibbana

> The first level, the Realm of Formlessness (Arupaloka), consists of > four planes of brahmas who have no physical body, consisting entirely > of mind, but who may create a physical body if they want to be seen. > They are not completely free from the fetters of suffering (dukkha), > but the dukkha experienced here is much less intense than that > suffered in the Rupaloka. These brahmas are unable to hear the > teachings of the Buddha (dhamma) and they can never become > enlightened. Buddhist rebirth in different planes of existence Q1) What is the difference between Arupaloka and Nibbana except Nibbana has no incarnation, no dukkha and has Buddhism teaching ? Q2) Why brahmas unable to hear the teachings of the Buddha at Arupaloka? > These brahmas are unable to hear the teachings of the Buddha (dhamma)