Watched it on tv in the 70s on a mid day show called The Money Movie. I only remember an astronaut on a planet that had these weird creatures, in plain sight, that had big round mirrors for hands and kept shifting. The end had the astronaut walk into this giant ball that opened up and closed when he walked in. Not much to go on, sorry. I was maybe 9 at the time.
This definitely sounds like “Mission Mars”(1968) starring Darren Mcgavin.
http://www.imdb.com/title/tt0063311/?ref_=nm_flmg_act_110
I seem to be having trouble posting links, I’m going to try on this older post. Here is the trailer, maybe.
And here is the entire movie