The technology required to travel between galaxies is far beyond humanity's present capabilities, and currently only the subject of speculation, hypothesis, and science fiction.
Theorized in 1988,[1] and observed in 2005,[2] hypervelocity stars move faster than the escape velocity of the Milky Way, and are traveling out into intergalactic space.
One of the mechanisms would be that the supermassive black hole at the center of the Milky Way ejects some stars from the galaxy at a rate of about one every hundred thousand years.
There is no known way to create the space-distorting wave this concept needs to work, but the metrics of the equations comply with relativity and the limit of light speed.
[9] A wormhole is a hypothetical tunnel through space-time that would allow instantaneous intergalactic travel to the most distant galaxies even billions of light years away.