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
(..) much joy while we're here. But we can keep up the life. We can defend those who can't defend themselves. I am the shield that guards the realm of men. Maybe we don't need to understand anymore than that. Maybe that's enough. Aye. Maybe that's enough. (..)2017 TvShow: Game of Thrones Title: Beyond the Wall Season: 7 Episode 6