What's outside the visible world

Reply Thu 22 Aug, 2019 03:56 pm
In ancient times, people stand on the ground and asked a question:"how wide is the ground?" They never got an explicit concept until they climbed high enough in the third dimension.
Now people wander in the cosmos and ask a similar question:"how big is cosmos?"...
Some information can be found in astronomical materials/reports that the visible world is about **billion light years. Don't mind the exact number. The question here is that:" what's outside the visible world?"
A. The visible world is infinite big. This answer is somewhat alike some ancient people's concept about the ground.
B. Nothing. This answer is a bit fishy. It render people wonder if it is an answer.
C. Invisible worlds.
D. No one knows.
Declaration: This is a game of philosophy here.
Thank you.
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