Back in 2011, three astronomers were awarded the Nobel Prize in Physics for their discovery that the Universe wasn’t just expanding - it was expanding at an accelerating rate.
The discovery led to the widespread acceptance of the idea that our Universe is dominated by a mysterious force called dark energy, and altered the standard model of cosmology forever. But now physicists say this discovery might have been false, and they have a much larger dataset to back them up.
I can not even imagine the logistics it would take to pilot a space craft from one place to another considering that the final destination will change over the long haul.
In science fiction they talk about warp drives which some scientists are presently developing.