Thanks, that's an excellent response! Assuming a constant density of earth like stars, a density of 200 earth likes in a 1500 light year sphere would mean one

Thanks, that's an excellent response! Assuming a constant density of earth like stars, a density of 200 earth likes in a 1500 light year sphere would mean one earth like in 250 light year sphere. Assuming a disk instead, it would be about 100 light years. Don't know how it relates to the local star neighbourhood... https://en.wikipedia.org/wiki/Orion_Arm https://en.wikipedia.org/wiki/Orion_Arm Of course, sampling from this small amount of data is pretty prone to problems...