Hi all, Just wondering how you decide what are good experiences now and what can wait?

For example my 25 month old has dead keen on the solar system at the moment, we have a chart,a couple of books and a picture dvd that she is devouring. At age/stage she is at we aren't really getting into the mechanics of things, just familiarity and curiosity. Would you be going to the observatory or waiting

I'm just worried by exposing her to all her interests as they come along might rob her of some of the wonder of having/remembering "firsts" when she is older. We have already done so much in terms of discovering new things (always after she has shown interest) I just remember what it was like to long to do something and finally be able to as a 7 year old etc. What do you do?