Anders had commented that Stapledon may have been the first to come up with a planet-sized brain and I had mentioned the overlap between Stapledon & Tsiolkovsky.
Anders wrote:
>
> Did Tsiolkovsky go beyond the merely trans-human level of people in
> his writings?
>
I'm not sure whether he dealt with trans-humanism per se but
he definately included interstellar colonization in his
"Plan for Space Exploration" (published ~1926).