There are 2 (no, no, 3...)... The human race and people who ask this stuff on wiki answers (and people who answer this stupid answer....
There are no known alien civilizations in our universe.
at least 12,600 trillion or more. For now, it is unknown.
negros
There are over 10,000 trillion alien races/civilizations (100,000+ per galaxy; excluding humans) in the Outlaw Star Universe.
There are over 10,000 trillion alien races/civilizations (100,000+ per galaxy; excluding humans) in the Code Lyoko Universe.
There are over 10,000 trillion alien races/civilizations (100,000+ per galaxy; excluding humans) in the Titan AE Universe.
If you counted 1 intelligent alien civilization per second, it would take 400 million years to count all 12,600 trillion intelligent alien civilizations in the universe.
In my opinion, yes. There are at least 12.6 million billion or more intelligent alien civilizations in the observable universe.
There is absolutely know way of knowing. So far we only intelligent civilization that we know of is our own. We have no idea of how common life is in the universe, let alone intelligent life. The number is probably too high for the observable universe. If there are 12.6 quadrillion civilizations in the observable universe of 100 billion galaxies, that gives us an average of 126,000 civilizations for an average galaxy. Since our galaxy has more stars than most that would suggest that there are several hundred thousand civilizations in the Milky Way, perhaps over a million. Suggesting so many civilizations exist in our galaxy would invoke the question of Fermi's paradox: where is everybody?
There are over 10,000 trillion alien races/civilizations (100,000+ per galaxy; excluding humans) in the Damocles Universe (the universe Sigma, the qeelocke, Damocles, the Sword, and One-Eyed Jack's crew originated in).
Yes, ancient Egyptians believed that the earth was the center of the universe and that the sun, moon, and stars revolved around it. This geocentric view of the universe was common in many ancient civilizations before the heliocentric model was accepted.
Possibly, it depends on one's philosophies and beliefs of others