A victory by the team seems 'within the realm of possibility'. [=a victory seems possible]
It's not 'beyond the realm of possibility' [=it's not impossible] that he will return.
new discoveries in the 'realm' of medicine
(..) This was my choice. Whether by your will or not... ...there is no ship now that can bear me hence. We've just passed into the realm of Gondor. Minas Tirith. City of kings. Make Way! It's the tree. Gandalf. Gandalf. (..)2003 The Lord of the Rings: The Return of the King