Simple enough question.
It's so interesting and thought-provoking.
For me, it is simply the beauty of everything in the universe, from galaxies to nebula to different stars.
(Fixed to make more sense in opening post @_@)
Knowing that maybe somewhere out there is a planet full of alien life. That, and the thrill of seeing such huge and beautiful objects.
Simply looking and realizing how small and insignificant we are.
Because of the fact that space is so endless and beautiful.
I like looking at the awesome stuff up in space.
Comets, asteroids, supernovas and nebulas(cause they all look cool...)
I just love it's general vastness and that ongoing sense of discovery and wonder. Scientists are always finding something new about space.
I also love the prevailing thought that we should someday get to see it all up close. (no matter how unrealistic achieving that may seem right now).
The paradoxical beauty of such powerful, intense and lethal forces captivates me to keep up with the latest in astronomical discoveries...