Assuming they are within our past light cone, how far away is the nearest spacefaring alien civilization?
35
Never closes
0-1 lightyears away (here in the solar system)
Beyond the solar system, 1-4 lightyears away (in Alpha Centauri)
5-10 lightyears away (~ 80 or so star systems)
11-50 lightyears away (~1.6k stars)
51-100 lightyears away (50k stars)
101-1000 lightyears away (250k-50k=200k stars)
Beyond 1000 lightyears but still within the Milky Way (200 bn stars)
Beyond the Milky Way but still within the local group (Andromeda, Magellanic Clouds etc.)
Beyond the local group but still within the Virgo supercluster (~2k galaxies)
Beyond the Virgo cluster but still within the Lanikea supercluster (100k galaxies)
Beyond the Lanikea supercluster but still within the observable universe (200 bn galaxies)
There is (currently) no spacefaring alien civilization within our past lightcone, so this question is moot.
This question is managed and resolved by Manifold.
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