Look what I found! A Trip to the Moon – often considered the first science fiction movie ever! This movie had a bit of a resurrection due to being featured in the movie Hugo. The short film (about fifteen minutes) was made in 1902 using theatrical tricks and the “stop trick” effect. Incidentally, on youtube you’ll find a variety of background soundtracks – they are all fair game. The silent film was intended to be played with a soundtrack accompaniment, but creator George Melies never specified what music should be played.
You can find five Melies films and information about them at Open Culture (openculture.com).