So many solar systems out there, life evolved in many planets for sure. No proof but no doubt.
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/pedant
Assuming the cosmological principle is true and the universe is infinite, wouldn’t we be guaranteed an infinite number of Sols? ;)
Also, Captain Archer in Enterprise used the name Sol when making contact with aliens.
In PIE it's sunnōn. In some languages that evolved to some variation of sun or son, in some to became sol (notably Latin). And many use both variations in some capacity