namaste everyone.
Just as a human soul--jIva, is expressed in three forms: physical, subtle (emotional/mental) and spiritual (Self), Devas have their three forms:
• In their AdhyAtmika--spiritual, form, they are manifestations of Brahman and the administrators of the gross universe and the subtle worlds.
• In their Adhidaivika--divine, form, they have a divya-sharIram--divine, gross body, in which form they reside in the devalokas--divine worlds.
• In their Adhibautika--gross elemental, form, they are dissolved in the elements of the universe.
KAnchi ParamAchArya in his lecture on Vedic sacrifices has this to say:
http://www.kamakoti.org/hindudharma/part5/chap19.htm
"The devas, or celestials. While in this world they remain dissolved in the five elements, in the celestial world they exist in a visible form. Those who have obtained siddhi or perfection by chanting the mantras can also see them in their gross form in their celestial abode besides receiving their blessings in their subtle form. The gods emanated from the Paramatman as a result of the vibrations produced by the mantras. We may therefore describe the mantras as the 'sonic' form of the deities."
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As for other physical worlds with human-like residents, although Science says it is only a remote possibility, Hindu PurANas do speak of them as indicated by NayaSurya (post no.5).
Theosophy speaks of globes and chains and lifestreams involving Devas, humans and planets. According to this knowledge system, there was a Moon Chain of life on the planet Moon which on its termination migrated to the Earth and started an Earth Chain of Life. In future, the Moon which is now a satellite of the Earth will disintegrate completely and Earth will become a sattlite to the globe where the next chain of life starts (possibly Mars).
Check this book for further details:
'The Solar System' by Arthur E. Powell,
http://www.scribd.com/doc/16619974/A...e-Solar-System
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