unfamiliar territory

an area of knowledge unknown to the speaker. We are in unfamiliar territory and I don't know the answer. Astronomy is unfamiliar territory for me, and I cannot answer any questions about the stars.

Common Names:

Name	Pronounced	Usage
Fraser	FRAY-zər, FRAY-zhər	Scottish, English (Rare)
Hideaki	hee-de-ah-kee	Japanese
Shaw (2)	SHAW	Scottish
Bora (3)	-	Korean
Balendin	-	Basque
Yi	-	Chinese