If you met a nomadic alien fleet and asked where they were from, you might not get an answer,

not because they are hiding it, because the question itself no longer applies.

What happens when a civilization outlives its species, its home world, and even its original

purpose, but keeps moving anyway.

Science fiction has been asking versions of this question for decades, from wandering alien flotillas like the Quarons in Mass Effect, to the refugee fleets of Battlestar Galatka,

to far-old or quieter nomads into that in hard science fiction. We tend to imagine nomads as

wanderers by choice, people who move because they love

movement, who trade stability for freedom, who carry a romantic vision of the open road or open

sky. But in science fiction, and in our own history, nomadism rarely begins as a lifestyle preference.

A far more often is a survival strategy. Alien nomads in fiction are rarely wanderers for

wanderers' sake. Their entire species of breakaway cultures, exile, survivors, traitors, or remnants,

for whom stalling proved more dangerous than leaving. A civilization becomes nomadic when

staying put stops working. In low-tech, prehistoric

eras that often meant running out of food to hunt or gather, and nomadism was likely the default

state of early humans, but it also happened suddenly to settled societies. When a home, or an entire

home world is lost to war, climate collapse, artificial intelligence rebellion,

or some internal disaster that makes return impossible, including exile by one's own kin.

It can also happen slowly. Expansion may outpace governance. Political unity may fail to keep up with technological reach,

or the dangers being found may begin to

outweigh the comforts of being settled. In those cases, motion is not a luxury, it's camouflage.

If you're new here, I'm Isaac Arthur, and this is Science and Futurism, where alongside

near-term science and space topics, we often explore alien civilizations and other science fiction

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