Stars formed each year over average life of the Milky Way galaxy:
Percent of those stars with planets:
Planets per star that can support life:
Percent of planets capable of life where life arises:
Percent of planets with life where intelligent life arises:
Percent of planets with intelligent life that develops high technology:
Length of time these societies survive:
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Our best guess at how alone we are in the Milky Way.
The Milky Way, our home, is one of 100,000,000 galaxies.