Hi Julianne,
I don't remember when I first learned about space. I remember being interested in it in grade school, so it must have been by then. I remember in high school how neat I thought the Voyager images from Jupiter were! I thought I migh want to become an astronomer, but there were other things I was interested in too - both in and out of science.
Mostly I did pretty well in science in school and I like problem solving, so it was pretty likely I'd become some sort of scientist. I was considering a variety of diferent things - even after I went to graduate school I was considering studying the Earth's atmosphere, but eventually I got a position working with data from the Sun.