The Sphere of Infinity of Space is one of the "heavenly" planes of existence (not enlightenment), obtainable, "observable" through the Jhanas. It is one of the formless realms, after the four material Jhanas.
(from Anguttara Nikaya 9.36)
References[]
- The Complete Book of Buddha's Lists -- Explained. David N. Snyder, Ph.D., 2006.
- http://www.thedhamma.com/