Ah. She must be from a pre-warp society - or well, she supposes she should say pre-interstellar travel, given what she knows now about both this universe and Kaidan's - but she's hardly going to hide the truth from her, given the circumstances. She'll find out about planets and spaceships soon enough.

"Well we - those of us the Cetagandans call "exotics" - all come from different... planes, as you would call it, but then within each of those planes are millions of other worlds." She pauses thoughtfully. "How much do you know about astronomy?"