Intergalactic travel is space travel between galaxies. Due to the enormous distances between the Milky Way and even its closest neighbors, any such venture would be far more technologically demanding than interstellar travel. Intergalactic distances are roughly one-million fold (six orders of magnitude) greater than their interstellar counterparts. The technology required to travel between galaxies in a feasible way and within a human lifetime is far beyond man's present capabilities, and is currently only the subject of speculation, hypothesis, and science fiction.
Read more about Intergalactic Travel: The Difficulties of Intergalactic Travel and A Possible Solution, Natural Intergalactic Travel, Nearest Galaxies
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“Travelling, gentlemen, is medieval, today we have means of communication, not to speak of tomorrow and the day after, means of communication that bring the world into our homes, to travel from one place to another is atavistic.”
—Max Frisch (1911–1991)