See the world

R's status message: "I want to see the world"
J and R are two of my 'travel maniac' friends.

During some dinner:
me: I think touring around the world is an online problem. We should also consider that we might die in any year.
So we shouldn't postpone many of those must-sees to later years. Moreover, we should consider the safety of the
destination. If we visit a risky country this year, our probability of being able to visit a safe country next year will be reduced.
J: He already suggested that. I already take this into account.

But anyway, what I want to say here is that .... by now we know that the Earth is not the World. The World is (at least) the universe that we're living in. Even if we visit every inch of this planet, it's still insignificant. The fraction of the world 2^{-k}, where is k is some astronomical number.

So we actually 'see' more of the world by studying astronomy. If we don't care about actually 'seeing', but satisfied with appreciation of the 'world', then we should study cosmology.