I've wondered what film this was, which I saw as a kid. Plot included astronauts landing on a rocky planet, and if you stepped into the sunlight, you would fry. Rocks would come alive to attack them.
The name of this movie is Missile to the Moon (1958). Rock monsters, a giant spider monster and beautiful girls in an air filled cave, lots of heat from the sun, great big diamonds and a alien, from the moon, who came to earth, but does not make it back to the moon.
This is the movie you are looking for (saw it as a child in a movie theater). Look for it on Amazon and other websites. A great little "gem" of a movie.
Hope this answers your questions.
PS: I have a copy of this movie
Could it be "The Thunderbirds Are Go"?
A feature movie based on the "Thunderbirds" by Sylvia and Gerry Anderson.
The main characters were actually marionettes. After the landing craft arrives on mars, close investigation reveals the snake-like "rocks" are alive.