Why do you go away? So that you can come back. So that you can see the place you came from with new eyes and extra colors. And the people there see you differently, too. Coming back to where you started is not the same as never leaving.
Terry Pratchett, A Hat Full of Sky
Source: Goodreads
I am Homeward Bound 
The reason for this being our solar system is orbiting around the centre of our galaxy at the speed of 828,000 km/h and the length of one orbit is just about 250 million years. So can never go to the place you came from. Science ruins everything!