I suspect once we colonize the solar system we will send out a colony ship that would likely be at a percentage of the speed of light. Something like a 100 years to reach a different solar system. This is all theory but the speed of research is improving faster than what practical things allow. For instances if we decide to colonize Mars at our technology level it would take a 1000 years or so. However about 2 decades ago that thought was entirely fictional. In a few decades the idea of colonizing Mars might be doable in 500 years and a few decades after that it would take a lifetime. So I would take any estimate with a grain of salt because future tech is something that is highly unpredictable. With in a few years from analogue we have gone to a digital medium in most of our stuff in a nanosecond if we look at the past's timeline.
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