This is the famous Drake equation from the 1960s to estimate
the number of advanced civilizations in the galaxy.
Depending on your initial assumptions,
the number of advanced civilizations in our galaxy according to Drake's equation could range from virtually zero to a whopping 36.4 million.
Not exact matches
We are confident that a
civilization a million years more
advanced than our own would find our concept
of number intelligible (and we, theirs), but our jokes would have them scratching their heads in puzzlement.
Spiral galaxies such as the Great Nebula in Andromeda are obvious candidates, but the elliptical galaxies are much older and more highly evolved and could conceivably harbor a large
number of extremely
advanced civilizations.
In 1961, American astronomer Frank Drake proposed a formula that could be used to roughly estimate
of the
number of intelligent and technologically
advanced extraterrestrial
civilizations in the Milky Way.
A large
number of archaeological sites indicate that for hundreds
of years Belize was home to around one million Maya, whose relatively
advanced civilization reached its height between AD 250 and 900.
For countless centuries before the invasion
of Spanish adventurer and European culture, Peru was the home to an amazing
number of advanced cultures and
civilizations.