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
Kavita	-	Indian, Hindi, Marathi
Praskovya	prah-SKOV-yah	Russian
Jehan	-	Medieval French
Julianna	yuw-lee-AHN-nah (Polish), joo-lee-AHN-ə (English)	Hungarian, Polish, English
Erez	-	Hebrew
Emanuele	-	Italian