That depends on what you consider to be a spacefaring civilization. By the loosest definition, we already are, but I suspect most people would consider colonizing Mars (and thus becoming an interplanetary civilization) to be the bare minimum to qualify as "spacefaring". That will probably happen within the next hundred years, assuming a civilization-ending disaster doesn't happen before then. Even when that happens, it will likely be centuries before a Martian colony can survive independent from
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