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
Jaydon	JAY-dən	English (Modern)
Bishop	BISH-əp	English
Charleen	shahr-LEEN, chahr-LEEN	English
Siti	-	Malay, Indonesian
Elouan	-	Breton, French
Kristian	KREES-tyahn (Swedish), KREES-tee-ahn (Finnish)	Swedish, Norwegian, Danish, Finnish