Actually the dwellers of heaven and hell are more advanced in
technology than we are. A speculation I make here is we find
UFOs-unidentified flying objects reported for so long in the sky since
world war times.
It could be possible that the dwellers of other planetary systems
travel in spaceships and that's not capture so well in our radars. And
their speed is more than that of sound Waves. So they know us well but
we dont know even ourselves so well what to speak of them and then the
Supreme Lord who maintains the heaven,hell and the whole cosmic
manifestation.

--
Yours
Dinesh
Blog:http://dinesh-krsna.blogspot.com

Residents of heaven&hell are so advanced materially than we are!