Perhaps a list of 10 isn't enough to capture most of the good ones, especially given variations in different peoples opinions. I like top 50 or top 100. Here are some other interesting lists that came up.
Looking forward to the low budget "Europa Report" when it comes out in November.
http://www.film4.com/special-feature...-sci-fi-movies
http://en.wikipedia.org/wiki/List_of...ut_outer_space
http://io9.com/top-10-most-gorgeous-...med-1442053579
http://www.imdb.com/list/JwkNp7kTj0Y/
http://www.ranker.com/list/the-best-...e-movies-lists