The overwhelming distances of space travel may be just too much ...
Lets assume all hospitable planets in the area are 6,000,000,000 light years away.The light has taken that long to reach out super hubble #5 scope.We can then date the planet to at least 6 billion years old.a few thousand years later and our bags are packed and convoy ready to go.We sail off into space towards our new planet around half the speed of light,so the trip will take roughly 12,000,000,000 years(use the bathroom now before we leave!)...our prospect planet is now at least 18,000,000,000 years old.The result would most likley be...
We arrive and find the planet without atmosphere or life..ah well,lets go home...we would arrive back just in time to see our sun swallow the earth.
Try once,fail twice...