Answer:
Difficulty
Explanation:
Space exploration was the last thing the world could have thought of dabbing into because the idea of moving away from the earth and flying in the sky wasn't even an easy one for man, hence the difficulty attached with going into other planets was a big success.
Many trials were made before the eventual success experienced, this many difficulties man overcame is what is meant by barrier in this sense.
The second one is correct he refuses
Answer:
It is ironic because people can not stay young forever, a lot of people DO appreciate there beauty, they are NOT granted and people CAN waste time.
Hope this helped! Have a great day.
