About 100MY

The fastest man-made spacecraft so far are the Helios probes, which reached 0.000234c. Let’s say one manages to build probes about 4 times faster, reaching 0.001c (that’s still well within the bound where impact by interstellar dust would damage or even wipe out the probe).

The Milky Way being 100,000 Light-Years in diameter, that puts a contraint of about 100 Million Years to travel accross it all. Respectable, but not daunting, by evolutionnary standards.

Yet, as far far as close  neighborhood goes, that speed would put the 32 closest stars to the Sun within 16,000 Years of travel. That, on the other hand, is a little bit frustrating, our best shot at landing on an inhabitable place being quite further away still…

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