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
(..) Let's sit down a minute. Misery of miseries. Once... a king gave a feast... for the loveliest princesses in the realm. Now, a soldier who was standing guard... saw the king's daughter go by. She was the most beautiful of all... and he instantly fell in love. (..)1988 Cinema Paradiso