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Our world is a planet where human beings have formed many societies.
Nobody knows whether there are intelligent beings on other worlds.
There are about one septillion (1024) worlds in the universe.[1][2][3]
References
[edit source]- ^ Burci, Gian Luca; Vignes, Claude-Henri (2004). World Health Organization. Kluwer Law International. Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).. Pages 15–20.
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Open access icon
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
