The sky is the doorway to the universe, it is the first obstacle for the expansion of humankind.
Human ancestors have looked at the sky for millennia in awe. Followed the stars and built instruments to track them. The night sky brings amazing memories to the people that are lucky enough to be able to see the uncountable number of stars in the sky.
The blue, the side effect of light bouncing in the particles in the sky, brings a sense of peace and clarity. When it turns to dark it finishes the day, but sometimes, as if by magic the hues of pink and purple fill the sky and bring about one of the most amazing states of the sky.
It is the first frontier for the exploration of the cosmos. When astronauts go towards the sky, in human made machines, it's one of the most profound human experiences. Being able to go beyond is a goal. The Overview effect opens the mind.
The sky is earth's companion, earth's most important asset. It makes possible the existence of the human race. Not for long as it is about to change as we venture towards the stars. The journey is not for everyone. Most will just be able to look up, and be grateful for where they live.