For ancient man or neanderthal, vastness of the Earth was probably unknown. He probably knew that the land under his feet is huge. But how huge? He had no idea. Apart from that scaling those distances on known ways of transports was unimaginable. By no stretch of thought he could have imagined that he would go round the earth in his lifetime... neither did he do that. Air travel was just a figment of his imagination. But today it is very much real.
Today we are neanderthals with respect to space travel. With theory of relativity, easy interstellar travel seems impossible by any stretch of imagination. But the future man will invent the "air crafts" to scale these distances very easily. In time after that, man will feel difficult to imagine a life without space travel in the same way today we see life impossible without a.... the list is so long... TV? Cell phone? Cars? You name it!
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