Advance or What?

My daughter is I think a fast learner. She is jus 2 but she talks like she is 4 onwards and say things that amuses me. Just now, she was already talking about planets! Like how did she even know about that? Now as a Mom, I am kinda frightened on how to handle her situation. I dont know how to deal with her intelligence. She really is fast. What should I do considering that I am 6mos pregnant with my 3rd baby. Thanks!