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[The background depicts the Voyager Spacecraft, humanity's first interstellar probe—our inspiration.]
The Andromeda Galaxy is only two and a half million light years away and is approaching at 300 kilometers per second. A spacecraft traveling towards it, averaging 500 kilometers per second relative to the Milky Way, would reach it in about a billion years.
2.5E6*kmPerLy/(300+500)/secPerYr ≅ 990.9E6
kmPerLy = 10E12
secPerYr = 365*24*60*60
last modified 2017 Oct 5 09:09 EDT