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14,168,339 results
The universe is incredibly old, astoundingly vast and populated by trillions of planets -- so where are all the aliens? Astronomer ...
4,489,851 views
6 years ago
The universe is unbelievably big – trillions of stars and even more planets. Soo… there just has to be life out there, right?
34,291,362 views
9 years ago
