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Posted on 11/20/18 at 7:12 pm to nola000
1). The range of the electromagnetic emanating from the Earth is probably a radius of 1 LY. You need truly power EM emitting sources to be detected over in stellar distances
2). Galactic civilization density. There may be tens or hundreds of galactic civilizations on the other arm of our galaxy. There may be 1 or 2 on this arm. The Andromeda galaxy may have thousands of advanced civilations. We may have 1 or 2 in the Milky Way.
2). Galactic civilization density. There may be tens or hundreds of galactic civilizations on the other arm of our galaxy. There may be 1 or 2 on this arm. The Andromeda galaxy may have thousands of advanced civilations. We may have 1 or 2 in the Milky Way.
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