I've actually not watched that many films about astronaut, most of the film involving space travel or space itself involve astronauts but I usually focus on the story and the theme, usually just plain old sci-fi or horror but sometimes its a family adventure. Don't forget to check out what Wandering Through the Shelves picked, the blog that started Thursday Movie Picks.
Le Voyage dans la Lune
Georges Méliès' masterpiece about a a rocket ship that lands on the Moon and who the astronaunts encounter there. At only 18 minutes it manages to capture such weird and wonderful creations and a story so simple. Released in 1902, Georges Méliès intially sold his film at fair grounds but the exhibitors were reluctant to pay such a high price for the film so Méliès gave a print for a free. The film was so successful an exhibitor bought the film and gave extra money to Méliès for the inconvenience. I've only seen it once and its magical, especially the iconic Man in the Moon.