If Milky way galaxy (in which our solar system resides) has 10 Billion earth size planets, then it follows that since in the universe there are Billions of galaxies, there are 100,000,000,000,000,000,000 earths out there!
But don’t get your hopes up, aliens from those earths are not going to start a 3rd party here. They are all millions of light years away from us.
FTL ships change the game.
And don't bring up Einstein - he only dealt with speeds approaching lightspeed.
He said nothing about speeds faster than light.
BTW, FTL means they're already here. What, you don't see them landing on the White House lawn? Why should they? Would YOU land on the White House lawn?
“..there are 100,000,000,000,000,000,000 earths out there!”
Yep, and they’re all us...heh heh heh. Another Time and another place...