[aebtebeten]

I couldn't find it on en.wikipedia, but Konstantin (the man) seems to have been a precursor of transhumanists: https://fr.wikipedia.org/wiki/Constantin_Tsiolkovski#Cosmism... .

[bserge]

https://en.wikipedia.org/wiki/Konstantin_Tsiolkovsky

He was considered one of the founding fathers of cosmonautics in the USSR.

[082349872349872]

Yes, I believe he's on the left in the pantheon: https://earth.google.com/web/@29.56025315,-95.08501348,28.52... but the english wikipedia article talks mostly about those of his ideas which had substantial impact, and doesn't mention his more science-fictional manifestos.

(My guesses: Циолковский, Королёв, Гагарин, ??)

[bserge]

I believe the last photo is Alexey Leonov possibly with Pavel Belyaev (not really sure), of the Voskhod 2 mission. Leonov was the first person to do a spacewalk.

https://en.wikipedia.org/wiki/Alexei_Leonov

https://en.wikipedia.org/wiki/Pavel_Belyayev (some interesting tidbits about the Voskhod 2 mission there)