YOU SAID:
I don't understand, what is astronomy
INTO JAPANESE
私は理解していない、天文学とは何か
BACK INTO ENGLISH
I don't understand, what is astronomy?
INTO JAPANESE
私は理解していない、天文学とは何ですか?
BACK INTO ENGLISH
I do not understand, what is astronomy?
INTO JAPANESE
私は理解していない、天文学とは何ですか?
BACK INTO ENGLISH
I do not understand, what is astronomy?
That didn't even make that much sense in English.