How reality changes with age..

When i was child I think the surrounding as a entire world. One fantastic event I remember was 

my concept of sunrise and sunset. I think the sun sets in the west and travels through southern mountain and again rises on east.

Then I knew that my country is Nepal and my village is one of the 4000 village in Nepal. I also knew that earth is round. I imagined the Nepal is entire world and it is round by touching all sides.

Then I knew  earth is  only a planet in solar system.

Now I know that earth is a little planet in entire universe and I am a short living animal whose presence or absence  do not effect the universe.

Some years later how I feel I don't know............................