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the speeds of our current spacecraft, it should have been eminently possible to have colonized the entire galaxy many times over
during its 13 billion year history.
That's a long period of time for all of that colonization to have taken place, and you really don't need to have fast rockets to colonize the entire galaxy by now.
Listen to native speakers pronounce “13 billion year” in real conversational contexts with synchronized timestamps and subtitles.