Which phrase describes the most likely historical and cultural content of a story that begins with a description of an astronaut climbing into a spaceship?

Answer: Space Travel

Explanation: From the contents of the story, an astronaut is climbing into a spaceship. The two words associated with space travelling are 'Astronaut' and 'Spaceship'. The astronauts action is used show what is happening at the moment in time. The spaceship is about leaving the space station for its journey into space.