how much light years it will take to smash. andromeda to milkyway,?
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However, the lateral speed (measured as proper motion) is very difficult to measure with a precision to draw reasonable conclusions: a lateral speed of only 7.7 km/s would mean that the Andromeda Galaxy is moving toward a point 177,800 light-years to the side of the Milky Way ((7.7 km/s) / (110 km/s) × (2,540,000 ly)), ...
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177,800 light-years it smash .
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