= Intergalactic travel
{wiki=Intergalactic_travel}
Intergalactic travel refers to the concept of traveling between galaxies, which are vast systems of stars, planets, gas, dust, and dark matter held together by gravity. This idea goes beyond interstellar travel, which is confined to travel within a single galaxy, such as our own Milky Way. Since the distances between galaxies are enormous—millions of light-years apart—intergalactic travel poses immense scientific and technological challenges.
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