I have driven about 3000 miles on a single trip. It took me a few weeks, since I was in no hurry and stayed a few places along the way for a spell. It is around 3000 miles across the US from Sea to Sea. But that is a drop in the bucket for a world traveler. It is about 25000 miles around the Earth at the equator. It takes the Earth around 24 hours to make one revolution, so it is spinning (at the equator) about a thousand miles an hour. Any distance is minuscule compared to distance in space. Just look how long it took to get to the moon and then to mars even with the Viking missions.
The Voyager 1 space probe that was launched 35 years ago is just now about to leave our solar system. How long would a "space ship" take just to get to the nearest star. What about the prospects of getting to another galaxy? I wonder why we would want to since we will never explore our own Milky Way. The distances are just way too great.
So, you may ask, just how big do galaxies get. The record breaker so far is NGC 6872. Here is picture of it:
The distance between the tips of its two arms is 522,000 light years. Even if you could travel at half the speed of light, it would take 261,000 years to make that trip. Could you imagine packing up your RV for a trip that far?!?!? In my humble opinion, man is destined to spend the future in our own little solar system or very near by. Maybe by the time that the Earth becomes unliveable, we will have perfected huge space stations or space cities that could keep civilization going. Of course by the time that is necessary, we may be an extinct species. Hey, it is Monday, make the best of it, you hear?