Well, work on the interdimensional or muldimensional hypotheses have been done by some astrophysicists. Instead of thinking of aliens as space visitors, Jacques Vallee links UFOs, aliens, to paranormal, psychic and spiritistic manifestations.
As an alternative to the extraterrestrial visitation hypothesis, Vallée has suggested a multidimensional visitation hypothesis. This hypothesis represents an extension of the ETH (extraterretrial hypothesis) where the alleged extraterrestrials could be potentially from anywhere. The entities could be multidimensional beyond space-time, and thus could coexist with humans, yet remain undetected.
They can appear and disappear at will, create virtual reality scenarios, be visible to a person in a place while invisible to other people in the same area. The other odd stuff is their ability to go through walls, appear as orange lights, blue lights etc., and manipulate space and time in strange ways. Therefore many have linked them to the spirit dimension.
You can consult the scientists below:
Jacques Vallee - "Masters of Deception"
Dr Karla Turner - "Masquerade of Angels"
The Secret Commonwealth of Elves Fauns & Fairies
- by Terry Melanson ©, 2001 (Last Update: May 11th, 2005)
That´s my view on heaven:
http://www.watchtower.org/e/20100201a/article_02.htm
On hell:
http://www.watchtower.org/e/20020715/article_02.htm