If it only takes 600 years to reach Andromeda, and it has lots of species, why didn't the reapers go there to harvest stuff, instead of traveling 50,000 years into dark space?

There should be plenty of galaxies in closer range for them to harvest, shouldn't there?

If it only takes 600 years to reach Andromeda, and it has lots of species, why didn't the Reapers go there to harvest stuff instead of traveling 50,000 years into dark space?

There should be plenty of galaxies in closer range for them to harvest, shouldn't there?

If it only takes 600 years to reach Andromeda, and it has lots of species, why didn't the reapers go there to harvest stuff instead of traveling 50,000 years into dark space?

There should be plenty of galaxies in range for them to harvest shouldn't there?

If it only takes 600 years to reach Andromeda, and it has lots of species, why didn't the reapers go there to harvest stuff, instead of traveling 50,000 years into dark space?

There should be plenty of galaxies in closer range for them to harvest, shouldn't there?