re: P.S. I'm a Sagan fan myself
I was 12 when Cosmos came out. I watched it that year and then told my parents I wanted the book for Christmas. i still have the worn out book. After that I got his Cosmic Connection book, and some of his other works.
He is the one that got me interested in terraforming.
I wish he could be here to see Spirit and Opportuniy. The Mars we see today is a different than the one he knew as a kid.