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<blockquote data-quote="Umbran" data-source="post: 6650756" data-attributes="member: 177">There's a couple of reasons for that:1) There's no actual purpose to invoking multiple galaxies.&nbsp; Having multiple galaxies doesn't get you things you don't already have in a single galaxy.&nbsp; You get all the types of stars and planets you need in one galaxy, or even a subset of one galaxy.&nbsp; You have huge spaces, and huge numbers of possible worlds, and total population sizes impossible for the human mind to really grasp, all within the one galaxy.2) The scales of distances involved.&nbsp; Our galaxy is 100K to 180K light years across.&nbsp; The *nearest* major galaxy (Andromeda) is 2,500,000 million light years away - an order of magnitude and more farther away.&nbsp; The ability to travel between galaxies in anything like a reasonable time (from a human perspective) implies near-teleportation within our own galaxy.&nbsp; If it takes a week to get to Andromeda, you can get across our galaxy in 8 hours, and getting to Alpha Centauri takes about one second.&nbsp;&nbsp; That wreaks havoc with some of your worldbuilding, or requires you to start imposing some pretty arbitrary limitations on the travel methods to support the society you're trying to represent.</blockquote>

[QUOTE="Umbran, post: 6650756, member: 177"] There's a couple of reasons for that: 1) There's no actual purpose to invoking multiple galaxies. Having multiple galaxies doesn't get you things you don't already have in a single galaxy. You get all the types of stars and planets you need in one galaxy, or even a subset of one galaxy. You have huge spaces, and huge numbers of possible worlds, and total population sizes impossible for the human mind to really grasp, all within the one galaxy. 2) The scales of distances involved. Our galaxy is 100K to 180K light years across. The *nearest* major galaxy (Andromeda) is 2,500,000 million light years away - an order of magnitude and more farther away. The ability to travel between galaxies in anything like a reasonable time (from a human perspective) implies near-teleportation within our own galaxy. If it takes a week to get to Andromeda, you can get across our galaxy in 8 hours, and getting to Alpha Centauri takes about one second. That wreaks havoc with some of your worldbuilding, or requires you to start imposing some pretty arbitrary limitations on the travel methods to support the society you're trying to represent. [/QUOTE]

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