When I was 13 (in the late 70s) I stayed with my aunt and uncle for a few weeks. One day on the tv there was a black and white scifi movie.
The only thing I remember about this movie is a scene of an desolate alien landscape with a large sphere. It reminded me of the moon's surface. There are astronauts - I think one was a woman. The sphere then opens up - almost like an orange - and the sections are the tentacles of a large (gigantic) octopus-like creature.
As I said, that's the only thing I remember about the movie, so it must have been scary to have made an impact on me.