what space movie came out in 1972

The space movie that came out in 1972 is "Silent Running". It is an American environmental-themed science fiction film directed by Douglas Trumbull and stars Bruce Dern. The movie is about a future where all flora is extinct on Earth, and an astronaut is given orders to destroy the last of Earths botany, kept in a greenhouse aboard a spacecraft. The film received mixed reviews upon its release, but it has since gained a cult following and is considered a classic of the genre.