[John Locke]

Interesting, but I still prefer the original wording:

Innumerable suns exist; innumerable earths revolve around these suns in a manner similar to the way the seven planets revolve around our sun. Living beings inhabit these worlds.

[Giordano Bruno, of course, philosopher and martyr]

[Varda]

Bruno's more a myth than a martyr.(The Folly of Giordano Bruno )

As for the idea that that there's intelligent life on other planets who knows how long that's been bandied about about, the Greeks considered it, the Scholastics commented on it. It's an idea that's been out there for a long time.