π 1950 the question "Where is everybody ?" occurred to #Fermi at lunch π½οΈ one day.
β’ The #MilkyWay π contains hundreds of billions of stars π, and billions of them are similar to the #sun βοΈ.
β’ It is highly likely that some of these stars will have planets πͺ that are similar to #Earth π.
β’ If we assume β via the #Copernican principle β that Earth is not particularly special, then #intelligent life should also exist on some fraction of these Earth-like #planets.
β’ Some of these intelligent life-forms might develop advanced technology, and even #InterstellarTravel.
β’ #Interstellar travel would take a long time, but as there are many sun-like #stars that are billions of years older, there has been plenty of time β for such #travel to have occurred.
β’ Given all this, why havenβt we met or seen π any trace of #aliens π½ ?
https://cosmosmagazine.com/space/exploration/what-is-the-fermi-paradox/
Picture : https://commons.wikimedia.org/wiki/File:Enrico_Fermi_and_Bruno_Pontecorvo_1950s.jpg
#fermi #milkyway #sun #earth #copernican #intelligent #planets #interstellartravel #interstellar #stars #Travel #aliens #fermiparadox
#19febbraio 1473, nasce l'astronomo polacco NiccolΓ² Copernico. Noto per aver promosso l'evidenza del sistema eliocentrico contro il sistema geocentrico fino ad allora sostenuto in Europa.
#Astronomy #History
#sole #Terra #astronomia
#Copernican revolution
@museogalileo
#copernican #astronomia #terra #sole #history #astronomy #19febbraio