It is inspiring to see humans pushing the barriers of space exploration and creating successful solutions for it." What does the word barriers suggest about space exploration?

Challenges

Explanation:

The word 'barriers' suggests the difficulty and the vast challenge and mystery that is space exploration.

Space is sort of like a limitless and expanding entity and the conditions in space is not particularly favourable to human existence and activities. On that note, this poses a huge challenge for astronauts and other space scientists trying to do their jobs. It therefore requires more efforts, research, funds and creativity to be able to explore space and profer solutions to current and future problems that might arise from space. Such solutions being meteorological predictions of weather conditions, satellite launching and the study of changes in space that might affect our planet.