Where does “поднебесный” come from?

поднебесный (Russian) comes from Russian поднебесье, from Russian не́бо, from Old Church Slavonic небо, from Proto-Slavic nȅbo, from Proto-Balto-Slavic *nébas, from Proto-Indo-European nébʰos, from Proto-Indo-European -os — Creates action nouns or result nouns from verbs;...

поднебесный (Russian): heavens; celestial, heavenly

Definitions

  1. heavens; celestial, heavenly

Ancestry of “поднебесный”, step by step

StepLanguageWordMeaning
1Russianподнебесьеheavenly heights, skies, heavens
2Russianне́боsky
3Old Church Slavonicнебоheaven; sky
4Proto-Slavicnȅbosky
5Proto-Balto-Slavic*nébascloud
6Proto-Indo-Europeannébʰoscloud; mist, moisture
7Proto-Indo-European-osCreates action nouns or result nouns from verbs;...
Every word from Proto-Indo-European -os →Every word from Proto-Indo-European nébʰos →Every word from Proto-Balto-Slavic *nébas →