There are two things that have always had my interest, dating back as far as my memory reaches, space (specifically its vastness) and philosophy...well, actually three -- girls took the third seat until I turned twelve, but that goes without saying :)

It's truly inconceivable how large our universe is, what with its hundreds of billions of stars per galaxy, of which our sun is only average sized (if not on the lower end), and over a billion galaxies with hundreds, thousands and even millions of light-years separating some of them.